J. Plant Nutr. Soil Sci. 2008, 171, 483–497 DOI: 10.1002/jpln.200700023 483 Podzol development with time in sandy beach deposits in southern Norway§ Daniela Sauer1*, Isabelle Schülli-Maurer1, Ragnhild Sperstad2, Rolf Sørensen3, and Karl Stahr1 1 Institute of Soil Science and Land Evaluation, Hohenheim University, Emil-Wolff-Str. 27, 70599 Stuttgart, Germany Norwegian Institute of Forest and Landscape, 1431 Ås, Norway 3 Norwegian University of Life Sciences, 1432 Ås, Norway 2 Abstract The coastal areas of SE Norway provide suitable conditions for studying soil development with time, because unweathered land surfaces have continuously been raised above sea level by glacio-isostatic uplift since the termination of the last ice age. We investigated Podzol development in a chronosequence of six soils on sandy beach deposits with ages ranging from 2,300 to 9,650 y at the W coast of the Oslofjord. The climate in this area is rather mild with a mean annual temperature of 6°C and an annual precipitation of 975 mm (Sandefjord). The youngest soil showed no evidence of podzolization, while slight lightening of the A horizon of the second soil (3,800 years) indicated initial leaching of organic matter (OM). In the 4,300 y–old soil also Fe and humus accumulation in the B horizon were perceptible, but only the 6,600 y–old and older soils exhibited spodic horizons. Accumulation of OM in the A horizons reached a steady state in <2,300 y, while in the B horizons OM accumulated at increasing rates. pH dropped from 6.6 (H2O)/5.9 (KCl) in the recent beach sand to 4.5 (H2O)/3.8 (KCl) within approx. 4,500 y (pHH2O)/2,500 y (pHKCl) and stayed constant thereafter, which was attributed to sesquioxide buffering. Base saturation showed an exponential decrease with time. Progressive weathering was reflected by increasing Fed and Ald contents, and proceeding podzolization by increasing amounts of pyrophophate- and oxalate-soluble Fe and Al with soil age. These increases could be best described for most Fe and Al fractions by exponential models. Only the increasing amounts of Fep could be better described by a power function and those of Feo by a linear model. Key words: soil chronosequences / Podzols / beach deposits / Norway Accepted August 20, 2007 1 Introduction Podzol formation has attracted scientists since the beginning of modern pedology. Keilhack (1912) already used different stages of weathering and podzolization in sand dunes to reconstruct the coastal development of an area along the Baltic Sea. Since then, many Podzol chronosequence studies have been conducted. In this paper, we report observations on Podzol development in sandy beach sediments along the SW coast of the Oslofjord (Norway). Our results are then compared to those obtained from other areas of the world in order to draw some general conclusions about Podzol development. A look through the existing literature shows that the rates of Podzol formation vary in a wide range, depending on parent material, precipitation, temperature, and vegetation (Tab. 1). However, in most studies incipient podzolization was observed through formation of a weak E horizon after about 200 to 500 y (Burges and Drover, 1953; Jauhiainen, 1973; Zech and Wilke, 1977; Singleton and Lavkulich, 1987; Lichter, 1998; Barrett, 2001; Mokma et al., 2004). In some cases, podzolization was perceptible already after 100 or less years (Tamm, 1915, 1920; Mellor, 1985; Alexander and Burt, 1996; Stützer, 1998), while in some other studies it took >500 y until first signs of podzolization occurred (Protz et al., 1984; Little, 1986; Tonkin and Basher, 2001). The maximum time required was 3,000 to 4,000 y (Birkeland, 1984). The development of mature Podzols usually took approx. 1,000 to 5,000 y (Tamm, 1915, 1920; Burges and Drover, 1953; Protz et al., 1984; Barrett and Schaetzl, 1992, 1993; Bäumler et al., 1997; Egli et al., 2001; Mokma et al., 2004; * Correspondence: Dr. D. Sauer; e-mail: [email protected] § Focus Issue Imprint of Environmental Change on Paleosols (editors: D. Sauer and R. Jahn). Selected Papers presented during the 18th World Congress of Soil Science (WCSS), July 9–15, 2006 in Philadelphia, Pennsylvania, USA. 2008 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim www.plant-soil.com Study area Mendenhall Glacier, SE Alaska Inner Himalaya (Central Nepal) Cairngorm Mts. (Scotland) N-shore of Lake Michigan, USA Emmet County, NE-shore of Lake Michigan, USA Mt. Cook area and Ben Ohau Range, S-Alps, New Zealand NSW, Australia, Pacific coast S of Woy Woy, New South Wales, Australia Two areas, Swiss Alps South of Sandane, SW-Norway Author(s) Alexander and Burt (1996), Burt and Alexander (1996) Bäumler et al. (1997) Bain et al. (1993) Barrett (2001) Barrett and Schaetzl (1992, 1993) Birkeland (1984) 2008 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim Bowman (1989) Burges and Drover (1953) Egli et al. (2001) Evans, (1999) Not reported 1.2 (Gletsch) 0.5 (Schmadri) Not reported (Narara: 16.8)c 2,500 not reported not reported succession: dune-colonizing flora → Australian tea tree → eucalyptus + gum myrtle 1,312 (Gosford) 2,000 eucalyptus forest 931 150 y to 10,500 y recent beach to approx. 4,000 y recent beach to 6,500 y BP moraines of gneiss 220 y to and quartz monzonite, >10,000 y 17 (four age groups) granitic glacial till, 6 (Gletsch), 2 (Schmadri) beach ridges of calcareaous sand, number not reported (at least 23 locations studied) beach ridges of calcareaous sand, 7 loess, eolian sand, till, 100 y to colluvium, debris-flow 9,000 y deposits, bedrock: greywacke and argillite Mt. Cook: succession to subalpine shrub + low forest Ben Ohau: grasses 10 y to 5,000 y 80 y BP to 13,000 y BP sandy lake terraces, 4 3,000 y BP to 1992: 18 drills + 1 pit 11,000 y BP per terrace, 1993: 6 more drills per terrace included sandy eolian sediments on beach ridges, 24 river terraces from acid schists, 6 135 y BP to late glacial <220 y / <220 y >700 to ≤3,300 y / >700 to ≤3,300 y >200 to ≤250 y / >1,000 to ≤2,000 y >0 to ≤2,500 y / >5,000 to ≤5,800 y approx. 8,000 to 9,000 y >3,000 to ≤4,000 y / <3,000 y BP / >4,000 to ≤10,000 y BP >10 to ≤230 y / >5,000 y >80 to ≤1,100 y BP / >5,460 to ≤10,000 y BP >550 to ≤2,500 y BP / >550 to ≤2,500 y BP >38 to ≤70 y / >90 to ≤240 y 10 to >240 y kame and moraines from granite, granodiorite, and metamorphic rock, 6 moraines from acid gneiss, 4 Age at which first signs of podzolization occurred / age at which first a mature Podzol occurred Timespan of chronosequence (youngest to oldest soil) Parent material, no. of soils of different ages studied mixed forest mixed forest dry calluna moor and lichen rich calluna moor dwarf shrubs succession: fireweed → alder + willow → cottonwood + spruce → spruce only Vegetation Sauer, Schülli-Maurer, Sperstad, Sørensen, Stahr 15.3 Mt. Cook: approx. 4,000, Ben Ohau Range: approx. 1,000 730–830 5.2 Mt. Cook: 7–8 Ben Ohau Range: 4 806 1,050 1,224 >2,500 Mean annual precipitation [mm] 10.5 Not reported (Braemar: 6.3)c 2.7 4.4–6.1 Mean annual temperature [°C] Table 1: Holocene chronosequences of Podzol development reported in the literature. 484 J. Plant Nutr. Soil Sci. 2008, 171, 483–497 www.plant-soil.com Study area Gulf of Bothnia, SW of Oulu, Finland Ivalojoki (NE-Finland) and Oulankajoki (E-Finland) river valleys Emmet County, NE-shore of Lake Michigan Fraser Island, SE-Queensland, Australia Two areas: Austerdalsbreen and Storbreen, Jotunheimen Mts., S-Norway S-Finland, chronosequence: Siunto Pickala, 4 older soils: Jalasjärvi, Toholampi, Sotkamo, Mikkeli Hudson Bay, Ontario SJames Bay, Ontario Author(s) Jauhiainen (1973) Koutaniemi et al. (1988) Lichter (1998) Little (1986) Mellor (1985) 2008 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim Mokma et al. (2004) Protz et al. (1984) Protz et al. (1988) –0.1 –5.5 Mikkeli: 6 Toholampi: 5 Siunto Pickala and Jalasjärvi: 4 Sotkamo: 3 Storbreen: –1 810 510 500–600 Storbreen: 1,500 Austerdalsbr.: 2,250 not reported (whole island: 1,200–1,800) not reported (whole island: 14.1–28.8)d Austerdalsbreen: 5 772 450–550 417 Mean annual precipitation [mm] 6.2 –1 to 0 3.0 Mean annual temperature [°C] recent beach to approx. 4,150 y >345 to ≤400 y / not reported <300 y BP / <300 y BP 340 to 500 y BP / >570 to ≤1,070 y BPb Age at which first signs of podzolization occurred / age at which first a mature Podzol occurred spruce with a few bal- sandy–fine gravely 1,100 y BP to sam poplar, lichens, storm beach ridges, 9 2,740 y BP (mosses) lichens, mosses, with candy–gravely <100 y BP to increasing density of storm beach ridges, 6 5,440 y BP spruce from the coast to the inland 4 older soils: 8,300 y to 11,300 y chronosequence: 230 y to 1,800 y 43 y to moraines, Austerdalsbreen area: from 230 y acidic granitic gneiss, 9 Storbreen area: from basic pyroxene-granulite gneiss, 7 ≤1,100 y BP / >1,100 to ≤1,160 y BP 750 to ≤1,893 y BP / >2,300 to ≤4,540 y BP ≤230 y / >1,800 to ≤8,300 y (estimated approx. 4,780 y) Jotunheimen area: ≤43 y (E horizons) / Podzols: not reported Jostedalsbre area: no Podzols, also beyond the Neoglacial zones beach and dune sand, <150 y to >300 to ≤2,000 y / 13 approx. 500,000 y >2,000 to ≤5,000 y (studied in 52 soil profiles) Giant Podzols: 40,000 y beach sand and Sotkamo, Jalasjärvi, sandy glacial and Siunto Pickala: scotch pine with silver outwash, birch, chronosequence: 7 Toholampi and Mikkeli: arable land surrounolder soils: 4 ded by coniferous forests Storbreen: low alpine zone Austerdalsbreen: subalpine birch woodland zone not reported 130 y BP to 3,010 y BPa Timespan of chronosequence (youngest to oldest soil) sandy river terraces, 300 y BP to in granulite area 9,500 y BP (Ivalojoki) / schist area (Oulankajoki), 4 groups of similar terrace heights/ages sandy beach ridges overlying granite and granodiorite, 16 Parent material, no. of soils of different ages studied young ridges: grasses, Lake Michigan sand dune–capped shrubs, ridges ≥225 years: beach ridges, 22 coniferous forest crowberry, blueberry, heather, mosses, lichens pine, spruce, birch, cranberry, crowberry, heather Vegetation J. Plant Nutr. Soil Sci. 2008, 171, 483–497 Podzol development with the time in sandy beach deposits 485 www.plant-soil.com Lake Ragunda area (N Sweden) Western S-Alps, New Zealand 8 Lake Huron, Pinery Provincial Park, SW-Ontario, Canada Tamm (1915, 1920) 2008 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim Tonkin and Basher (2001) VandenBygaart and Protz (1995) 1,800 856 9,850 succession: sites 1 + 2: grasses, sites 4–7: juniper, pine, heather, cranberry site 0: foredune slack (sand reed, marram grass) site 1: cedar savanna Sites 2–5: black oak savanna subalpine zone: snowgrass, scrub, and low forest coniferous forest b means ≤25 y / >80 y ≤100 y / ≤ 1,000 y, depending on vegetation >500 to ≤1,000 y / >1,275 to 7,000 y <25 y to 80 y <20 y to 7,000 to 8,000 ≥70 y / approx. 10,000 y moraines, 7 approx. 50 y to approx. 625 y >125 to ≤200 y >375 to ≤625 y >100 to ≤1,000 y / >4,700 y >339 to ≤1,019 y / >1,019 to ≤2,085 y >170 to ≤265 y / >265 to ≤371 y >193 y >193 y >400 to ≤3,000 y / >400 to ≤3,000 y Age at which first signs of podzolization occurred / age at which first a mature Podzol occurred 339 y to 5276 y 127 y to 550 y sand dunes (from 100 y BP to lime-/dolostone, chert, 4,700 y BP sand-/siltstone, metamorphic rock, mafics, felsics), 6 alluvium + colluvium from psammitic + pelitic schist sandy moraines, sandy and silty lake terraces, 8 sand dunes, 5 y = years before sampling, y BP = years before 1950 that the 240 y–old soil was a Podzol, while the next younger soil studied, in this case the 90 y–old soil, was still no Podzol c http://www.worldclimate.com d http://www.getaboutoz.com/fraser_island.htm#climate a 0 5.5 (Cropp Hut, 1982–1985) 1.84 490.5 (Östersund, Jämtland) site 1: beachgrass site 2: heathland sites 3–5: conifers (planted) 700 sandy esker deposits, 5 sitka spruce forest beach sand, 7 with shrubs and mosses scots pine (+ alder at the youngest site), cranberry, crowberry, mosses, lichens 80 y to 6,500 y Timespan of chronosequence (youngest to oldest soil) moraines, containing 33 y to 193 y 80% calcium carbonate, 6 (10 pits per moraine) stony moraines, 4 bare → meadow → blueberry → rhododendron + larch spruce, birch, willow, shrubs, mosses, lichens Parent material, no. of soils of different ages studied Vegetation 526 1,270 737 951 Mean annual precipitation [mm] Sauer, Schülli-Maurer, Sperstad, Sørensen, Stahr Zech and Wilke (1977) Ziller Valley, Austrian Alps W Jutland, Denmark Stützer (1998) July: 16 February: 1 (7.5 in Ålborg)c 3 (Kruunupyy airport) Central W-coast of Finland 2.1 Starr and Lindroos (2006) Robson Glacier, British Columbia, Canada Sondheim and Standish (1983) 3.6 9 (Tofino airport) Mont Blanc (N-Alps, Switzerland) Righi et al. (1999) Mean annual temperature [°C] Sondheim et al. Vancouver Island (1981), Singleton and (British Columbia, Lavkulich (1987) Canada) Study area Author(s) 486 J. Plant Nutr. Soil Sci. 2008, 171, 483–497 www.plant-soil.com J. Plant Nutr. Soil Sci. 2008, 171, 483–497 Starr and Lindroos, 2006). Some authors found Podzols already in 200 to 600 y–old sediments (Zech and Wilke, 1977; Singleton and Lavkulich, 1987; Koutaniemi et al., 1988; Alexander and Burt, 1996; Evans, 1999), while in other studies, Podzol formation required >5,000 y (Birkeland, 1984; Bowman, 1989; Bain et al., 1993; Barrett, 2001). Comparing these different studies, it must be mentioned that different classification systems, in which requirements for a Podzol differ to some extend, were used, and that also within each system definitions changed over time. 2 Study area The study area is located in Vestfold, at the W side of the Oslofjord (SE Norway), 59°04′ to 59°11′ N and 10°04′ to 10°20′ E (Fig. 1). Despite the rather high latitude, the climate is comparatively mild due to the influence of the Gulf Stream and other sea currents. The mean annual temperature is 6°C (Sandefjord), with average monthly temperatures ranging from –2°C in February to 16°C in July. Daily temperatures <0°C occur on averaged 117 d y–1. The mean annual precipitation is 975 mm, distributed to averaged 245 d, including 79 d with snow. Due to the mild climate and the vegetation cover, consisting mostly of mixed forest, Podzols only develop in sandy sediments, while soil formation in loamy parent materials leads to Albeluvisols (Schülli et al., 2007). Since the retreat of the inland ice at the termination of the last ice age, fresh sediments have been raised above sea level by glacio-isostatic uplift. The sea level curves of the area show a steady regression, so that the sediments continuously get older from the coast inland, while no distinct terraces were formed. The thickness of the beach sediments is usually limited, because at each location, beach conditions were only present during a transitional phase leading from a marine to a terrestrial environment. In the soils under investigation, the beach sediment thickness varies between 75 and 125 cm. 5 km Sw ed e d lan Fin G, 1, 2 x Sandefjord x3 Nor way n N 500 km x x6 5 x 4 Larvik xV Figure 1: Locations of pedons 1–6, forming the soil chronosequence. G and V indicate the places, where unweathered sand samples were taken from the recent beach (Gleabukta and Vesterøya). 2008 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim Podzol development with the time in sandy beach deposits 487 The sediments are sandy with some gravel (Tab. 2). Below the beach sands usually loamy marine sediments occur, leading to stagnic conditions at some depth. The rock which underlies the sediments is larvikite, a variety of monzonite which is of Permian age (Sørensen, 1988; Lutro and Nordgulen, 2004). Larvikite is a coarse-grained plutonic rock, rich in plagioclase and apatite, readily releasing plant nutrients (Sørensen et al., 2007). 3 Methods and material We dug six soil pits on sandy beach deposits ranging from 2,300 to 9,650 y in age and sampled additional two samples from the recent beach. The ages of the land surfaces were deduced from several local sea-level curves based on calibrated radiocarbon datings (Henningsmoen, 1979; Sørensen et al., 2007). The soil profiles were described according to FAO (1990, 2006), classified according to IUSS Working Group WRB (2006), and sampled horizon-wise. The samples were air-dried and passed through a 2 mm sieve. All analyses were carried out on air-dried fine earth using two replicates. The results were then referred to 105°C-dried soil including rock fragments. pH(KCl) and pH(H2O) were measured with a glass electrode at a soil-to-solution ratio of 2.5:1. The C contents were measured by a Leco CN-analyzer and considered as organic C (OC), since the samples contained no carbonates. Particle-size analysis was done by sieving of the sand fractions and using the pipette method for silt and clay fractionation (ISO/CD 11277). Samples with organic-matter (OM) contents >1% were treated with H2O2 prior to particle-size analysis. The cation-exchange capacity (CEC) was determined according to Chapman (1965) at pH 7 saturating all charges with Na+ ions, exchanging Na+ with NH 4 acetate, and analyzing Na+ in the solution by flame photometer. Also the base saturation was determined according to Chapman (1965) at pH 7 by exchanging the adsorbed cations with NH 4 acetate and analyzing the solution for Ca, K, Na (flame photometer), and Mg (AAS). Iron and Al were extracted by dithionite (Fed and Ald, Mehra and Jackson, 1960), oxalate (Feo and Alo, Tamm, 1932; modified by Schwertmann, 1964), and pyrophosphate (Fep and Alp, McKeague et al., 1971). The amounts of these Fe and Al fractions were measured by inductively coupled plasma–optical emission spetrometry (ICP-OES). The total element contents (Fet, Alt) were determined by X-ray fluorescence analysis of fused discs (only one replicate). The horizon data were transformed to pedon data which were plotted vs. soil age to obtain chronofunctions. For this purpose, weighted mean values of pH, CEC, and base saturation (BS) were calculated for each pedon up to 90 cm depth (mean values of the horizon data, weighted according to horizon thickness). The pH values were delogarithmized before averaging and afterwards again logarithmized. Pedon data of the amounts of different Fe and Al fractions (kg m–2) were calculated from the horizon data, considering rock-fragment content, bulk density, and horizon thickness, and summed up to 90 cm soil depth. Relationships were tested for statistical significance (a = 0.05) by Pearson’s correlation coefficient and t-test (linear relationships) or Spearman’s rank correlation (nonlinear relationships). www.plant-soil.com 488 Sauer, Schülli-Maurer, Sperstad, Sørensen, Stahr J. Plant Nutr. Soil Sci. 2008, 171, 483–497 4 Results and discussion 80 70 The youngest soil investigated, with an estimated age of 2,300 ± 150 y (these uncertainties include those of 14C dating and those of the elevation estimate, from which the ages were derived, based on local relative sealevel curves), had two Ah horizons (8 and 17 cm thick) followed by a Bw horizon, and exhibited no signs of podzolization (Tab. 2). Assuming the thickness of the upper Ah horizon (8 cm) as the normal Ah horizon thickness, the upper 17 cm of the soil were interpreted as colluvium. This assumption was confirmed by the absence of rock fragments up to this depth. The soil was classified as Endostagnic Umbrisol (Colluvic, Brunic, Hyperdystric, Endoskeletic, Arenic) according to WRB (IUSS Working Group WRB, 2006). The term “Endostagnic” is due to the underlying loamy marine sediments, causing stagnic conditions in the lower part of the soil. At the second site, the original soil with an approximate age of 3,800 ± 150 y was covered by a 37 cm thick colluvium, which exhibited slight bleaching of the A horizon, indicating incipient podzolization. The colluvial material consisted of beach sand eroded from the adjacent slope and hence was similar to the autochthonous beach sand. The buried soil had a BC horizon but showed no signs of podzolization. The complete pedon was classified as Brunic Arenosol (Colluvic, Protospodic). The third pedon with an age of approx. 4,300 ± 200 y showed clear bleaching in the lower part of the topsoil and accumulation of OM and Fe oxides in the subsoil. It was classified as Endostagnic Endoleptic Cambisol (Protospodic). Pedons 4 to 6 included three soils of 6,600 ± 170 y, 7,650 ± 130 y, and 9,650 ± 100 y in age, which all had spodic horizons. Pedons 4 and 6 were classified as Folic Endostagnic Podzols, pedon 5 as Endostagnic Podzol. Solum depth (including A, E, B, and BC horizons, excluding colluvium) increased from 39 cm in the 2,300 y–old soil to 87 cm in the 3,800 y–old soil, which corresponds to average rates of solum-depth increase of 2.3 cm per 100 y during the first 3,800 y of soil development. After 3,800 y, the solum depth varied between 74 and 105 cm showing no trend. Evans (1999) also reported a rapid initial increase in solum depth (5 cm per 100 y), which slowed down after 700 y (to 0.06 cm per 100 y). However, it has to be considered that in the four older soils of our sequence, the solum depth is influenced by sedimentary preconditions, since in pedon 3 it is limited by hard rock, in pedon 4 the sediment shows an increasing clay content below the solum depth, and in pedons 5 and 6 the sediment changes from sandy beach deposit into the loamy marine facies, which is less suitable for podzolization. Thickness of B horizons (including BC horizons) exhibited a time-dependent progress similar to that of solum depth (R2 = 0.41 for the power function). Increases in solum depth and B horizon thickness were also reported by other authors (Semmel, 1969, p. 32; Mellor, 1985; Singleton and Lavkulich, 1987; Koutaniemi et al., 1988; Barrett and Schaetzl, 1992, 1993; Evans, 1999). Burges and Drover (1953) found that after 2,000 y, the B horizon thickness only slightly increased, 2008 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim Combined thickness of Bh and Bs horizons 4.1 Soil profile morphology 60 50 40 30 20 10 0 4000 y = 0.008x - 8.74 R2 = 0.99 6000 8000 Soil age [ye ars ] 10000 Figure 2: Relationship between combined thickness of Bh and Bs horizons and soil age. while VandenBygaart and Protz (1995) observed a linear increase in solum depth and B horizon thickness with soil age up to 4,700 y. The combined thickness of Bh and Bs horizons showed a steady increase (Fig. 2), which is in agreement with Bowman (1989). The increase proceeded from 27 cm in the 4,300 y–old soil to 69 cm in the 9,650 y–old soil and could be described equally by linear, power, and exponential functions (R2 = 0.99 for all models). The linear model was considered more realistic than the other models which suggested increasing rates of thickness increase with soil age. No increase in thickness of albic horizons as reported by several authors (Singleton and Lavkulich, 1987; Koutaniemi et al., 1988; Bowman, 1989; Mellor, 1985) was observed, which is in agreement with Mokma et al. (2004), who found that Bs horizon and solum thickness increased with soil age while E horizon thickness showed no increase. 4.1 Organic-matter accumulation Amounts of OC in the A horizons (including AE horizons) seemed to reach a steady state at 4.4 to 4.8 kg m–2 within <2,300 y (Fig. 3a, Tab. 3). Afterwards, they were influenced rather by local environmental conditions than by soil age. This finding is in agreement with those of several authors who observed the achievement of a steady state of OC accumulation within relatively short time spans. Sondheim and Standish (1983) found in moraines of the Robson Glacier (British Columbia, Canada) that the soil organic-matter (SOM) contents reached a steady state within 100 to 120 y. Jacobson and Birks (1980) observed rapid SOM accumulation in the first 100 to 150 y and a more gradual increase between 150 and 250 y of soil development. VandenBygaart and Protz (1995) observed in sand dunes along Lake Huron (Ontario, Canada) that SOM contents showed a rapid increase in the first 1,000 y, a much slower increase between 1,000 and 2,000 y, and some variability without a clear further increase thereafter. Egli et al. (2001) found in moraines in the Swiss Alps that the OC content increased rapidly in the first 3,300 y and then seemed to achieve a steady state. www.plant-soil.com J. Plant Nutr. Soil Sci. 2008, 171, 483–497 Podzol development with the time in sandy beach deposits 489 Table 2: Soil-profile morphology and classification according to WRB (IUSS Working Group WRB, 2006). Pedon age [y]a classification according to WRB Vegetation Gleabukta Vesterøya recent beach, no vegetation Depth [cm]b –5 –5 Horizons Color (FAO, 2006) (moist) Structure Bulk (codes density according to [g cm–3] FAO, 2006) C C SG SG Gravel content [mass.%]c Sand [%] Silt [%] Clay [%] 0 0 98.4 99.3 0.5 0.4 1.1 0.3 0.93 1.23 1.25 1.30 1.64 1.64 0 0 20 40 60 25 71.9 71.1 78.8 85.7 80.0 60.7 14.1 15.4 11.4 10.6 16.6 22.3 14.0 13.5 9.8 3.7 3.4 17.0 1.32 1.50 1.28 1.28 1.28 1.33 1.60 1.68 1.59 5 20 0 60 50 20 <1 <1 <1 89.9 91.7 85.8 92.8 85.0 89.5 78.2 52.1 32.9 6.0 4.2 7.7 4.6 8.4 5.8 15.2 27.0 34.3 4.1 4.1 6.5 2.6 6.6 4.7 6.6 20.9 32.8 Pedon 1 2,300 ± 150 Endostagnic Umbrisol (Colluvic, Brunic, Hyperdystric, Endoskeletic, Arenic) forest: spruce, elm, oak, birch, hazel, mountain ash organic layer: +5: Oi Ah1 –8 Ah2 –25 Bw –46 BC –56 Cg1 –115 2Cg2 –135 forest: spruce, beech, aspen, birch, mountain ash, hazel organic layer: +9: Oi / +8: Oe / +3: Oa 10YR3/2 SB AE –7 10YR4/3 SB Bw1 –16 10YR3/2 PL Bw2 –21 10YR3/3 n.d. BC –37 n.d. 2.5Y2/1 Ahb –47 MA 2.5Y4/2 BC –77 MA 2.5Y4/2 BCg –124 MA-SB 2.5Y4/2 2Cg –138 oxidized: AB Cr –180 7.5YR5/8, 7.5YR6/6, reduced areas: N4/0 forest: oak, beech, birch, hazel, mountain ash organic layer: +3.5: Oi / +0.5: Oe –4 Ah 10YR2/2 GR+WC 0.81 –9 AE 10YR2/2 GR+WC 0.75 –22 Bh 10YR3/2 SB-MA 0.84 –36 Bs 10YR3/4 SG-GR 0.93 –50 Bw 10YR4/4 SG-SB 1.00 –90 BCg oxidized: SS 1.56 >90 2R 5Y5/6, reduced: 10YR4/3 0 0 15 15 10 5 rock 55.9 57.5 59.0 59.4 66.0 63.6 30.1 28.8 28.8 28.6 22.5 29.6 14.0 13.7 12.2 12.0 11.5 6.8 succession after clear cut (max. age of trees: 15 y): spruce, oak, birch, mountain ash, rush, raspberry, cranberry, heather, bracken Organic layer: +13: Oi / +9: Oe / +3.5: Oa 10YR2/1 SG (AE)e (–5) 10YR3/1 SG EA –13 7.5YR2/3 SCf Bhs –26 7.5YR3/3 SC Bs –54 10YR4/3 SB BC –74 10YR5/2 AB Cg –85 1.34 1.34 1.56 1.65c 1.66 1.80c 10g 17g 25g 60g 17g 0 82.8 88.3 95.0 96.2 80.9 70.8 12.7 8.1 2.7 2.4 13.1 17.8 4.5 3.6 2.3 1.4 6.0 11.4 1.01 1.00 1.27 1.27 1.55 1.71 1 5 25 30 30 10 82.9 85.7 91.4 87.5 76.2 42.5 11.8 8.6 3.1 7.6 16.6 37.1 5.3 5.7 5.5 4.9 7.2 20.4 1.01 1.01 1.04 1.64 1.58 0 1 0 75 22 84.9 87.1 84.6 84.2 42.4 9.4 8.5 5.5 8.1 36.9 5.7 4.4 9.9 7.7 20.7 10YR2/1 10YR3/1 2.5Y3/2 2.5Y4/2 2.5Y5/3 GR GR-SB SB SB n.d.d SB Pedon 2 3,800 ± 150 Brunic Arenosol (Colluvic, Protospodic) Pedon 3 4,300 ± 200 Endostagnic Endoleptic Cambisol (Protospodic) Pedon 4 6,600 ± 170 Endostagnic Folic Podzol Pedon 5 7,650 ± 130 Endostagnic Podzol organic layer: +7.5: Oi / +6.5: Oe / +2: Oa forest: 10YR2/2 SB –10 AE spruce, birch, elm, pine, 7.5YR3/4 SB –24 Bsh cotton wood, mountain SB 5YR3/4 Bs1 ash, elder, blueberry, ferns, –40 10YR4/6 MA –65 Bs2 wood sorrel, grasses, MA 2.5Y5/3 BCg –105 mosses oxidized: SB 2Cg –140 5YR4/6, reduced: 2.5Y6/3 Pedon 6 9,650 ± 100 Endostagnic Folic Podzol (Ruptic, Endoskeletic) forest: Spruce, oak, aspen, birch, mountain ash, blueberry, ferns, grasses, mosses organic layer: +10: Oi / +8.5: Oe / +3.5: Oa 10YR2/1 SB+SG AE –5 10YR3/2 SB+SG E –7 SB+SG 5YR3/6 Bs –30 n.d. 5YR3/4 2Bs –76 MA 2.5Y4/2 23Cg –105 a ages derived from calibrated 14C datings, given in calendar years before sampling (2003–2006) organic layer: depth of upper boundary, mineral soil horizons: depth of lower boundary c estimated d n.d. = not determined: In some cases the amounts of rock fragments were too high to determine soil structure. e discontinuous horizon f SC = slightly cemented g measured b 2008 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim www.plant-soil.com 490 Sauer, Schülli-Maurer, Sperstad, Sørensen, Stahr OC in A horizons [kg m–2] J. Plant Nutr. Soil Sci. 2008, 171, 483–497 OC in B horizons [kg m–2] 16 8 a b 14 12 6 10 4 8 6 2 4 2 0 0 0 2000 4000 6000 Soil age [years] 8000 10000 0 2000 4000 6000 Soil age [years] 8000 10000 Figure 3: Accumulation of organic carbon (OC) with time, a) in the A horizons (including AE horizons), b) in the B horizons (including Bw, Bh, Bs, BC horizons). The amounts of OC in the B horizons increase significantly with soil age (a = 0.05). The triangles indicate outliers, influenced by other factors than soil age. The amounts of OC in the 4,300 y–old soil are increased in both A and B horizons. The amounts of OC in the A horizon of the 6,600 y–old soil are decreased due to the open vegetation, being in a state of succession after forest clear cut approximately 15–18 y ago. Accumulation of OC in the B horizons (including Bw, Bh, Bs, BC horizons) reflected the progressive podzolization process (Fig. 3b). The rates at which OC accumulated increased with soil age could be best described by a power function (y = 0.003 x0.85, R2 = 0.99). The increase was statistically significant. 4.2 Soil pH Soil pH(H2O) in the upper 90 cm dropped steadily from 6.6 at the recent beach to 4.9 in the 4,300 y–old soil and stayed very constantly around pH 4.5 thereafter (Fig. 4a, Tab. 3). The decrease during the first 4,300 y could be described by an exponential (y = 6.48 e–7E–05x, R2 = 0.94) or linear model (y = –0.0004 x + 6.48, R2 = 0.92). pH(KCl), which was 5.9 at the beach, dropped more rapidly and had after 2,300 y (pH 4.0) almost achieved its (temporary) steady state which lay at pH 3.8 ± 0.1 (Fig. 4b). These different curves demonstrate that during the first 4,500 to 5,000 y of soil development, the pH(H2O) was buffered by H+ adsorption and release of exchangeable base cations to the soil solution, while pH(KCl), which includes the adsorbed H+, showed a more buried soil colluvium pH (H2 O) 7 rapid decrease. VandenBygaart and Protz (1995) also reported pH(CaCl2) decrease due to leaching of Ca+ and Mg+ ions, being replaced by H+. The decrease could be well described by a linear model for soils up to 2,900 y. In general, pH should drop until one of the soil’s buffer systems is activated. In this case, pH(KCl) achieved a buffer system a short time before podzolization became perceptible in the field (3,800 y). Therefore, we attribute the constant pH of the older soils to sesquioxide buffering. pH values staying constantly around pH 4 over several thousands of years were also observed in other Podzol chronosequences. Bain et al. (1993) found in soils in Scotland pH(H2O) values in the A horizons decreasing from 4.7 in the youngest (80 y–old) to 4.4 in the second-youngest (1,100 y–old) soil and then staying between 4.1 and 4.4 in all older soils up to 13,000 y. Birkeland (1984) observed in the S Alps of New Zealand that soil pH(H2O) in the upper 45 cm dropped from pH 6.1 in 100 y–old soils to pH 5.1 in a 500 y–old soil and then stayed constant (±0.2, except for one outlier) in all older soils up to 9,000 y. In soils on moraines in the mountains of SW Norway ranging from 220 to >10,000 y BP, Evans (1999) measured pH values pH (KCl) buried soil colluvium 7 a b 6 6 5 5 4 4 3 3 0 2000 4000 6000 8000 Soil age [ye ars ] 10000 0 2000 4000 6000 8000 Soil age [ye ars ] 10000 Figure 4: Changes of a) pH(H2O) and b) pH(KCl) with soil age (weighted mean values of soil-horizon data of the upper 90 cm). 2008 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim www.plant-soil.com J. Plant Nutr. Soil Sci. 2008, 171, 483–497 of 4.4 to 4.7 (averages of B horizons of several soils per moraine, pH measurement not specified, presumably pH[H2O]) in the B horizons, showing no relationship to moraine age. Koutaniemi et al. (1988) found on river terraces in Finland pH(H2O) values of 3.4 to 3.8 in the A horizons and 4.8 to 5.2 in the C horizons, also showing no trend with time. Egli et al. (2001) observed that soil pH(CaCl2) in the Swiss Alps decreased from pH 5.1 in the 150 y–old soil to pH 4.0 in the 260 y–old soil, stayed constant up to 700 y, and then slightly decreased to pH 3.7 in the 10,000 y–old soil. Singleton and Lavkulich (1987) found on Vancouver Island (Canada), that pH(CaCl2) in the upper 20 cm dropped from pH 4.6 in a 127 y–old soil to approx. pH 4 in all 371 to 550 y–old soils. 4.3 Base saturation The BS in the upper 90 cm exhibited an exponential decrease from 100% in the unweathered beach sand to 33% in the 2,300 y–old soil and finally to 0.8% in the 9,650 y–old soil (Fig. 5a, Tab. 3). This result agrees to the finding of Bain et al. (1993) who found an exponential decrease of BS with time in Scottish soils. At the same time, CEC increased significantly from 14.9 molc m–2 at the recent beach to 247.2 molc m–2 in the 7,650 y–old soil (Fig. 5b). The absolute amounts of exchangeable base cations also decreased exponentially (Fig. 5c). Also Zech and Wilke (1977) observed in moraines in the Austrian Alps that the amounts of exchangeable Ca decreased with soil age. The CEC increase was due to progressive clay formation and SOM accumulation. However, the increase in clay content was not statistically significant (Fig. 5d), because it was affected not only by clay formation but also by textural differences of the sediment layers. Accumulation of SOM in the A horizons had already achieved a steady state in the 2,300 y–old soil, but SOM illuviation into the B horizons proceeded with time so that the overall SOM amounts in the upper 90 cm increased with soil age. The CEC was strongly related to both the amounts of OC (Fig. 5e, R2 = 0.94, a = 0.001) and clay (Fig. 5f, R2 = 0.77, a = 0.01). 4.4 Dithionite-, oxalate-, and pyrophosphateextractable Fe and Al The amounts of dithionite-extractable Fe (Fed) increased significantly from 0.7 kg m–2 in the unweathered beach sand to 5.2 kg m–2 in the 9,650 y–old soil (Fig. 6a, Tab. 3), which could be described by both an exponential (R2 = 0.86) and a linear model (R2 = 0.85). The amounts of dithionite-extractable Al (Ald) showed a clearly exponential increase (R2 = 0.90) from 0.07 kg m–2 at the recent beach to 5.8 kg m–2 in the 9,650 y–old soil (Fig. 6b). These increases are in agreement with Singleton and Lavkulich (1987), who reported increasing amounts of Fed and Ald with time in the B horizons of soils in beach sands on Vancouver Island (Canada), ranging from 127 to 550 y in age. Also Barrett and Schaetzl (1992, 1993) found in soils on terraces of Lake Michigan (N America) increasing Fed contents of the B horizons. 2008 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim Podzol development with the time in sandy beach deposits 491 The Fed/Fet ratios exhibited an increase from 0.05 in the unweathered sand to 0.3 in the 9.650 y–old soil, which could be best described by an exponential model (y = 0.057 e0.0001x, R2 = 0.81). This trend agrees with that observed by Zech and Wilke (1977) in moraines in the Austrian Alps, where the Fed/Fet ratios in the upper 50 cm increased with time. In contrast, Egli et al. (2001) found Fed/Fet ratios increasing rapidly in the first 700–3,300 y of soil formation, but then staying on a constant level. The amounts of pyrophosphate-extractable Fe (Fep) showed a significant increase from absence of Fep at the recent beach to 1.2 kg m–2 in the 9,650 y–old soil (Fig. 7a), which could be described by a linear (R2 = 0.96) or power function (R2 = 0.999). The amounts of pyrophosphate-extractable Al (Alp) were very similar to those of Ald, mostly even exceeding the latter (Alp = Ald × 1.11, R2 = 0.96). Hence, Alp exhibited a similar exponential increase as Ald (Fig. 7b). Apparently, all pedogenic Al was poorly crystalline or SOM-bound. Some of the Al must have formed very stable complexes with SOM, which were more efficiently dissolved by pyrophosphate solution than by bicarbonate-citrate-dithionite solution. Increasing amounts of Fep and Alp with progressing Podzol development were also reported from Vancouver Island by Singleton and Lavkulich (1987) and from S Norway by Mellor (1985). Barrett (2001) found that Fep and Alp increases with time in soils on beach ridges of Lake Michigan could be best described by linear models. The amounts of oxalate-extractable iron (Feo) increased significantly from 0.4 kg m–2 at the recent beach to 3.3 kg m–2 in the 9,650 y–old soil, which could be best described by a linear model (Fig. 7c, Tab. 3). The amounts of oxalate-extractable aluminum (Alo) exhibited an exponential increase from 0.05 kg m–2 in the unweathered sand to 4.2 kg m–2 in the 9,650 y–old soil (Fig. 7d). Increasing amounts of Feo and Alo with time were also reported by Singleton and Lavkulich (1987) from soils on Vancouver Island and by Burt and Alexander (1996) from SE Alaska. Birkeland (1984) applied the soil-anisotropy concept of Walker and Green (1976), saying that at time zero of soil formation, soils are isotropic, that is, their properties do not change in any direction, and with progressive soil development, soils become increasingly isotropic. He applied a modified index of soil anisotropy (mIPA) to soils in the S Alps of New Zealand and found significant increases for mIPA-Feoxalate and mIPA-Aloxalate with soil age. Barrett (2001) found that the increases in Feo and Alo amounts with time could be best described by linear models. Also the Feo/Fed ratios tended to increase with time, which could be described by an exponential (y = 0.41 e6E–05x, R2 = 0.65) or linear model (y = 3E–05 + 0.39, R2 = 0.61). Zech and Wilke (1977) attributed increasing Feo/Fed ratios in soils on moraines in the Austrian Alps to higher OM contents of the older soils, which were assumed to increase the Feo contents. Interestingly, oxalate extracted more Fe but less Al than pyrophosphate. We therefore assume that there was a fraction of poorly crystalline Fe oxides which was dissolved by oxalate but not by pyrophosphate, the latter working more efficiently www.plant-soil.com 492 Sauer, Schülli-Maurer, Sperstad, Sørensen, Stahr Bas e s aturation in the uppe r 90 cm [%] 100 buried soil colluvium 90 y = 100e-0.0005x R2 = 0.91 80 J. Plant Nutr. Soil Sci. 2008, 171, 483–497 CEC in the upper 90 cm [mol c m–2] 250 y = 0.016x + 24.73 R2 = 0.67 200 70 150 60 50 100 40 30 50 a 20 b 10 0 0 0 2000 4000 6000 8000 Soil age [ye ars ] Exchangeable bases in the –2 upper 90 cm [molc m ] 0 10000 outlier (sample V, see Fig. 1) 2000 4000 6000 Soil age [years] 8000 10000 CEC in the upper 90 cm –2 [molc m ] 100 y = 88.42e -0.0005x R2 = 0.88 80 y = 1.84x R2 = 0.77 200 150 60 100 40 50 c 20 d 0 0 0 2000 4000 6000 Soil age [years] 8000 0 10000 20 40 60 80 Clay in the upper 90 cm [kg m–2] 100 Clay in the upper 90 cm [kg m–2 ] CEC in the upper 90 cm [mol c m–2] 100 90 y = 7.77x + 17.78 R2 = 0.94 200 80 70 150 60 50 100 40 30 50 20 e bf 10 0 0 0 5 10 15 20 OC in the upper 90 cm [kg m–2] 25 0 2000 4000 6000 Soil age [years] 8000 10000 Figure 5: Chronofunctions of a) base saturation (BS), b) cation-exchange capacity (CEC), c) exchangeable base cations, d) exchangeable Ca2+, e) amounts of clay, f) relationship between CEC and clay (the triangle marking an outlier), all parameters calculated per m2 down to 90 cm depth. All relationships are significant ( a ≤ 0.05), except for e). The data from the 3,800 y–old buried soil and colluvium usually fit well into the chronofunctions but were not included in the statistics. in extraction of OM-bound metal ions but less efficiently in sesquioxide extraction than oxalate. This fraction of poorly crystalline Fe oxides (difference Feo – Fep) exhibited an exponential increase from 0.39 kg m–2 in the unweathered sand to 2.11 kg m–2 in the 9,650 y–old soil (Fig. 7e). In contrast, the pedogenic Al fraction of the older soils included a marked amount of Al bound to SOM, which was extracted by pyrophosphate but not by oxalate. The values for (Alp – Alo) 2008 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim were negative at the recent beach, about zero in the 2,300 y–old soil, and then increased to 1.94 kg m–2 in the 9,650 y–old soil (Fig. 7f). This significant increase could be described by a power function (R2 = 0.996), exponential (R2 = 0.987), or linear model (R2 = 0.982). The negative (Alp – Alo) values in the first 2,300 y of soil development suggest that there is also a poorly crystalline Al fraction which is dissolved by oxalate but not by pyrophosphate. This fraction www.plant-soil.com J. Plant Nutr. Soil Sci. 2008, 171, 483–497 Fed in the upper 90 cm [kg m–2 ] buried soil colluvium Podzol development with the time in sandy beach deposits 493 outlier 7 Al d in the upper 90 cm [kg m–2 ] 7 0.91e 0.0002x y= R2 = 0.85 6 y = 0.120e 0.0004x R2 = 0.90 6 5 5 4 4 3 3 2 2 a 1 0 b 1 0 0 2000 4000 6000 Soil age [years] 8000 10000 0 2000 4000 6000 Soil age [years] 8000 10000 Figure 6: Significant progessive increase of the amounts of a) pedogenic Fe (Fed) and b) pedogenic Al (Ald) as extracted by bicarbonatecitrate-dithionite solution (weighted mean values of horizon data down to 90 cm depth). reduces the (Alp – Alo) values and hence causes an underestimation of the SOM-bound Al. If the amounts of this fraction of poorly crystalline Al are similar to those of the (Feo – Fep) fraction (Fig. 7e), this would lead to an underestimation of the amounts of SOM-bound Al (as calculated from Alp – Alo) of approx. 50%. 5 Conclusions In beach sands under natural vegetation in Vestfold (SE Norway) it takes >2,300 y and <3,800 y until soils exhibit a slightly bleached A horizon indicating initial podzolization. Although the thin colluvium on top of the 2,300 y–old soil may have masked the first signs of incipient podzolization, it can be concluded that podzolization starts relatively late, compared to other areas. This is attributed mainly to the vegetation, which is mixed forest, and to the mild climate allowing for a comparatively high activity of the soil fauna. Under these conditions, the litter is decomposed more completely and the formation of water-soluble stable organic compounds is less pronounced than in many areas with coniferous forest or heathland (e.g., Koutaniemi et al., 1988; Bain et al., 1993; Lichter, 1998) or cooler climate (e.g., Zech and Wilke, 1977; Protz et al., 1984, 1988; Mellor, 1985). In this regard, it has also to be mentioned that before immigration of spruce and beech to the area approx. 1,200 to 1,400 y ago, the area was covered with deciduous forest, so that the conditions for podzolization were even less conducive to podzolization. However, there must be also a considerable influence of parent material, because also in some areas with mixed forest and mild climate initial podzolization becomes perceptible within much shorter time spans (e.g., Jauhiainen, 1973; Stützer, 1998; Barrett, 2001; Mokma et al., 2004). The same holds true for the influence of precipitation, since in most areas with a mean annual precipitation exceeding approx. 1,250 mm, podzolization becomes visible within <300 y (e.g., Burges and Drover, 1953; Singleton and Lavkulich, 1987; Alexander and Burt, 1996; Evans, 1999). More than 4,300 y and less than 6,600 y are required for Podzol formation in Vestfold. This finding agrees with many studies in other areas, like that of Mokma et al. (2004) in S Fin 2008 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim land, VandenBygaart and Protz (1995) at Lake Huron (SW Ontario, Canada), Barrett (2001) at Lake Michigan, and Bain et al. (1993) in Scotland. The conditions in the Vestfold study area seem to be comparable to those in Emmet County, at the NE-shore of Lake Michigan (MAT 5.2°C), where Barrett and Schaetzl (1992, 1993) found on a 3,000 y–old terrace under mixed forest only Entisols, on a 4,000 y–old terrace Entisols and Podzols, and on 10,000 and 11,000 y–old terraces predominance of Podzols. The importance of vegetation is demonstrated by comparing this study to that of Lichter (1998), who reported under coniferous forest in Emmet County (MAT 6.2°C) incipient podzolization already within 400 y. Interestingly, rather similar time spans of podzolization were reported by Bowman (1989) from beach ridges along the subtropical Pacific coast of New South Wales, Australia (MAT 15.3°C, eucalyptus forest), where Podzol development required 5,000–5,800 y. In Vestfold, solum depth increased during the first 3,800 y at an average rate of 2.3 cm per 100 y. Bh and Bs horizons occurred first in the 4,300 y–old soil, then the combined thickness of Bh and Bs horizons steadily increased from 27 cm in the 4,300 y–old soil to 69 cm in the 9,650 y–old soil. Organiccarbon contents in the A horizons reached a steady state within <2,300 y. This observation is in agreement with most authors, since the time spans reported for the achievement of a steady state of OM contents range from 100–250 y (Jacobson and Birks, 1980; Sondheim and Standish, 1983) to 2,000–3,000 y (VandenBygard and Protz, 1995; Egli et al., 2001). Accumulation of OC in the B horizons proceeded at increasing rates, which could be best described by a power function. This may be explained by enhanced production and translocation of water-soluble organic acids as biological activity decreases. pH in the upper 90 cm dropped from pH 6.6 (H2O)/5.9 (KCl) to pH 4.5 (H2O)/3.8 (KCl) and then stayed constant, which was attributed to sesquioxide buffering. pH(KCl) dropped more rapidly than pH(H2O) and had almost achieved the buffer system after 2,300 y, while pH(H2O) reached it approx. 2,000 y later, due to buffering of exchangeable base cations. The achievement of a (temporary) steady state of pH was observed in several Podzol chronosequences, whereby the steady-state values of pH(CaCl2) lay www.plant-soil.com 494 Sauer, Schülli-Maurer, Sperstad, Sørensen, Stahr Fe p in the upper 90 cm [kg m–2 ] buried soil colluvium J. Plant Nutr. Soil Sci. 2008, 171, 483–497 Al p in the upper 90 cm [kg m–2 ] outlier 7 2 y = 0.198e 0.0003x R2 = 0.99 6 5 4 1 3 2 y = 0.0001x + 0.08 R2 = 0.96 0 0 2000 4000 6000 Soil age [years] 8000 1 a b 0 10000 0 2000 4000 6000 Soil age [years] Feo in the upper 90 cm [kg m–2 ] Al o in the upper 90 cm –2 [kg m ] 4 5 y = 0.0003x + 0.39 R2 = 0.998 10000 y = 0.098e 0.0004x R2 = 0.90 4 3 8000 3 2 2 1 1 c d 0 0 0 2000 4000 6000 Soil age [years] 8000 0 10000 2000 4000 6000 Soil age [years] (Fe o – Fep) in the upper 90 cm [kg m–2 ] (Al p – Alo) in the upper 90 cm [kg m–2 ] 2 2 y = 0.446e 0.0002x R2 = 0.96 8000 10000 1 1 0 e f -1 0 0 2000 4000 6000 Soil age [years] 8000 10000 0 2000 4000 6000 Soil age [years] 8000 10000 Figure 7: Temporal development of the amounts of a) pyrophosphate-extractable Fe (Fep), b) pyrophosphate-extractable Al (Alp), c) oxalateextractable Fe (Feo), d) oxalate-extractable Al (Alo), e) Feo – Fep, f) Alp – Alo in the upper 90 cm of the soils (weighted mean values of horizon data). All relationships are statistically significant ( a ≤ 0.05). around pH 4 (Singleton and Lavkulich, 1987; Egli et al., 2001) and those of pH(H2O) a little higher (Birkeland, 1984; Bain et al., 1993). Base saturation showed an exponential decrease from 100% at the recent beach to 0.8% in the 9.650 y–old soil, indicating rapid leaching of exchangeable base cations, compared to the rate of base-cation release from mineral weathering. The 2008 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim amounts of pedogenic Fe and Al as extracted by bicarbonate-citrate-dithionite solution showed exponential increases, indicating increasing weathering rates. This enhancement of weathering intensity is attributed to the observed pH decrease and to increasing surface area of the mineral grains as the soil texture becomes finer during progressive weathering. The increasing amounts of Fep and Feo could be described by linear models, those of Fep by both power function www.plant-soil.com J. Plant Nutr. Soil Sci. 2008, 171, 483–497 Podzol development with the time in sandy beach deposits 495 Table 3: Analytical data of the soils. Pedon Depth age [y]a [cm] classification (IUSS Working Group WRB, 2006) Gleabukta Vesterøya OC [%] BS pH (KCl) pH (H2O) CEC [cmolc kg–1] [%] Fet Fed Feo Fep Alt Ald Alo Alp [g kg–1] [g kg–1] [g kg–1] [g kg–1] [g kg–1] [g kg–1] [g kg–1] [g kg–1] 17.7 14.0 1.6 0.4 0.7 0.2 0.00 0.00 63.0 68.1 0.10 0.05 0.12 0.06 0.01 0.01 –5 –5 0.2 0.0 7.6 5.6 7.4 6.4 2.1 1.2 100 100 –8 –25 –46 –56 –115 –135 5.9 2.8 0.7 0.1 0.1 0.1 3.6 3.5 4.1 4.5 4.6 4.8 4.8 4.7 5.7 6.1 6.4 6.8 27.3 24.7 9.9 2.8 1.9 7.4 25.0 8.2 22.9 33.2 37.8 60.3 26.7 26.9 24.6 24.0 24.4 30.6 4.7 6.2 3.6 2.0 2.7 4.5 2.8 3.1 2.0 1.2 1.2 1.1 2.71 1.74 0.64 0.12 0.05 0.00 70.8 71.4 70.4 67.0 63.9 70.9 1.98 2.64 1.34 0.38 0.19 0.28 1.61 1.93 0.98 0.40 0.19 0.30 2.59 1.98 0.87 0.27 0.10 0.03 –7 –16 –21 –37 –47 –77 –124 –138 –180 1.9 0.5 1.9 0.2 1.2 0.3 0.3 0.3 0.3 3.5 3.8 3.8 4.1 4.0 4.2 4.3 4.4 4.5 4.3 4.5 4.4 4.8 4.7 5.2 5.5 6.3 6.5 12.6 6.3 12.3 2.7 7.2 5.5 5.1 9.6 13.1 3.4 2.9 3.0 2.3 3.0 4.9 12.2 57.6 58.8 19.3 18.6 17.0 27.9 21.6 25.8 24.4 31.9 37.4 1.7 1.5 0.9 2.0 1.9 1.9 2.9 4.2 3.3 1.1 0.9 0.7 1.2 1.0 1.1 1.6 1.3 1.9 0.35 0.15 0.19 0.12 0.41 0.50 0.48 0.09 0.14 69.5 71.1 73.3 68.7 69.5 62.4 63.9 70.7 74.5 0.99 0.53 1.28 0.29 1.04 1.11 1.20 0.22 0.29 0.95 0.61 1.47 0.29 0.93 1.00 1.08 0.41 1.02 0.72 0.34 1.01 0.22 1.65 1.44 1.42 0.12 0.10 –4 –9 –22 –36 –50 –90 11.7 9.8 4.6 3.1 2.0 0.1 3.4 3.7 4.1 4.1 4.2 4.1 5.0 4.6 4.6 4.9 4.9 5.0 37.0 38.6 24.1 20.5 17.4 6.5 19.3 7.3 2.9 1.3 1.0 2.8 41.3 40.1 40.3 41.1 36.8 31.9 8.6 9.0 10.0 9.5 5.8 4.6 4.4 4.7 5.3 5.4 2.9 1.9 4.43 4.21 2.93 3.18 1.83 0.71 71.1 72.6 72.0 78.0 76.0 70.6 3.90 4.20 3.67 7.19 6.14 0.97 2.66 3.05 2.66 4.78 4.59 0.98 5.33 5.82 4.35 7.72 7.27 0.93 (–5)b –13 –26 –54 –74 –85 2.1 1.3 0.6 0.2 0.4 0.2 3.1 3.3 3.7 3.7 4.0 4.4 3.8 4.0 4.4 4.4 4.9 5.2 17.0 10.5 5.3 2.3 4.3 5.0 1.4 1.8 2.4 2.3 2.3 14.7 9.8 12.8 18.3 17.4 20.9 24.2 1.3 2.6 2.3 1.3 1.9 3.0 0.7 1.1 1.2 0.9 1.1 1.2 1.27 1.38 1.22 0.54 0.75 0.31 66.5 67.5 71.3 68.4 74.4 76.3 1.67 0.94 0.92 0.51 1.58 0.58 1.45 0.90 0.77 0.38 2.12 0.64 2.52 1.32 1.37 0.57 1.93 0.68 –10 –24 –40 –65 –105 –140 4.8 2.9 1.0 0.4 1.2 0.1 3.3 3.8 4.2 4.3 4.3 3.9 4.1 4.3 4.6 4.8 5.0 5.3 28.0 25.3 11.3 6.7 3.9 8.9 1.8 0.96 0.69 1.0 3.1 25.6 22.5 26.4 25.7 26.6 25.4 35.0 5.9 9.6 4.0 2.3 2.5 7.2 3.5 6.5 2.8 2.2 1.7 4.1 2.91 2.52 0.64 0.57 0.16 0.16 60.9 65.0 63.6 61.9 67.8 71.0 2.59 5.14 3.32 1.24 1.08 0.95 1.82 3.40 2.16 1.52 1.72 1.09 3.18 5.41 3.31 2.17 1.12 0.59 –5 –7 –30 –76 –105 7.6 3.6 3.6 0.9 1.0 3.0 3.2 3.8 4.0 4.2 4.1 4.2 4.5 4.6 5.0 38.8 21.6 32.7 9.0 17.8 1.7 1.4 0.78 0.61 1.2 14.4 15.0 22.6 29.8 40.5 2.4 2.7 8.7 7.8 6.8 1.3 1.3 6.1 5.6 3.3 1.34 1.09 2.23 0.55 0.81 57.0 56.8 64.1 69.8 82.4 2.80 1.73 7.56 2.88 7.36 1.95 1.24 4.74 1.80 7.18 3.29 2.39 8.90 3.20 6.27 Pedon 1 2,300 ± 150 Brunic Endostagnic Umbrisol (Colluvic, Hyperdystric, Endoskeletic, Arenic) Pedon 2 3,800 ± 150 Brunic Arenosol (Colluvic, Protospodic) Pedon 3 4,300 ± 200 Endoleptic Endostagnic Cambisol (Protospodic) Pedon 4 6,600 ± 170 Endostagnic Podzol Pedon 5 7,650 ± 130 Endostagnic Podzol Pedon 6 9,650 ± 100 Endostagnic Podzol (Ruptic, Endoskeletic) a b ages derived from calibrated discontinuous horizon 14C datings, given in calendar years before sampling (2003–2006) 2008 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim www.plant-soil.com 496 Sauer, Schülli-Maurer, Sperstad, Sørensen, Stahr J. Plant Nutr. Soil Sci. 2008, 171, 483–497 and linear models. Oxalate extracted more Fe than pyrophosphate, indicating the presence of a poorly crystalline Fe fraction (Feo – Fep), which exhibited an exponential increase. Also the amounts of Alp and Alo increased exponentially. Pyrophosphate extracted more Al than oxalate, pointing to an Al fraction strongly bound to SOM (Alp – Alo), which also showed an exponential increase. Barrett, L. R., Schaetzl, R. J. (1993): Soil development and spatial variability on geomorphic surfaces of different age. Phys. Geogr. 14, 39–55. It can be concluded that all Fe and Al fractions exhibited statistically significant increases. In some cases, the character of the increase (linear or exponential) was not clear, due to the limited number of data (two fresh beach-sand samples, six soil profiles) and some variability. However, the relationships of most Fe and Al fractions could be best described by exponential increases. We therefore assume that these parameters increase at relatively low rates as long as the pH is still in a range which allows for efficient plant-litter decomposition and within which Al is immobile. As soon as the pH drops to values lower than approx. pH 4.5, several processes are initiated or enhanced, including element release from mineral weathering, Al mobilization, and occurrence of chelate-forming organic compounds due to inhibited plant-litter decomposition. The concurrent activation or intensification of these processes leads to exponential increases of the related chemical parameters. Burges, A., Drover, D. P. (1953): The rate of Podzol development in sands of the Woy Woy district, N. S. W. Aust. J. Bot. 1, 83–94. Acknowledgments We thank all people, who contributed to this study by laboratory analyses or financial support. The pyrophosphate and dithionite extractions were carried out by Lars Boll within the work for his bachelor thesis, the pH(KCl) measurements were done by Bettina Höll, the analyses of C and N by Kornelia Ruf, the ICP-OES analyses of Fe and Al in the extracts by Andrea Ruf, and part of the CEC and exchangeable base cations were analyzed by Beate Podtschaske. The German Academic Exchange Service (DAAD) and the Universitätsbund Hohenheim supported this work by travel allowances in the years 2003 (DAAD) and 2004 (Universitätsbund Hohenheim). We are also grateful to the two reviewers and the associate editor, Reinhold Jahn, for their valuable comments on the manuscript. References Alexander, E. B., Burt, R. (1996): Soil development on moraines of Mendenhall Glacier, southeast Alaska. 1. The moraines and soil morphology. Geoderma 72, 1–17. Bäumler, R., Madhikermi, D. P., Zech, W. (1997): Fine silt and clay mineralogical changes of a soil chronosequence in the Langtang valley (Central Nepal). Z. Pflanzenernähr. Bodenkd. 160, 413–421. Bain, D. C., Mellor, A., Robertson-Rintoul, M. S. E., Buckland, S. T. (1993): Variations in weathering processes and rates with time in a chronosequence of soils from Glen Feshie, Scotland. Geoderma 57, 275–293. Birkeland, P. W. (1984): Holocene soil chronofunctions, Southern Alps, New Zealand. Geoderma 34, 115–134. Bowman, G. M. (1989): Podzol development in a Holocene chronosequence. I. Moruya Heads, New South Wales. Aust. J. Soil Res. 27, 607–628. Burt, R., Alexander, E. B. (1996): Soil development on moraines of Mendenhall Glacier, southeast Alaska. 2. Chemical transformations and soil micromorphology. Geoderma 72, 19–36. Chapman, H. D. (1965): Cation-exchange capacity. In: C. A. Black (ed.): Methods of soil analysis – Chemical and microbiological properties. Agronomy 9, 891–901. Egli, M., Fitze, P., Mirabella, A. (2001): Weathering and evolution of soils formed on granitic, glacial deposits: results from chronosequences of Swiss alpine environments. Catena 45, 19–47. Evans, D. J. A. (1999): A soil chronosequence from neoglacial moraines in western Norway. Geografiska Annaler 81A, 47–62. FAO (1990): Guideline for soil description. 3rd edn., FAO, Rome, Italy. FAO (2006): Guideline for soil description. 4th edn., FAO, Rome, Italy. Henningsmoen, K. E. (1979): En karbon-datert strandforskyvningskurve fra søndre Vestfold, in Nydal, R., Westin, S., Hafsten, U., Gulliksen, S. (eds.): Fortiden i søkelyset. Univ. forlaget, Trondheim, pp. 239–247. Jacobson, G. L., Birks, H. J. B. (1980): Soil development on recent end moraines of the Klutlan glacier, Yukon Territory, Canada. Quat. Res. 14, 87–100. IUSS Working Group WRB (2006): World reference base for soil resources 2006. World Soil Resources Reports No. 103. FAO, Rome. Jauhiainen, E. (1973): Age and degree of podzolization of sand soils on the coastal plain of northwest Finland. Commentationes Biologicae 68, 1–32. Keilhack, K. (1912): Die Verlandung der Swinepforte. Jahrbuch der Preussischen Geologischen Landesanstalt zu Berlin, Band II, pp. 209–244. Koutaniemi, L., Koponen, R., Rajanen, K. (1988): Podzolization as studied from terraces of various ages in two river valleys, Northern Finland. Silva Fennica 22, 113–133. Lichter, J. (1998): Rates of weathering and chemical depletion in soils across a chronosequence of Lake Michigan sand dunes. Geoderma 85, 255–282. Little, J. P. (1986): Numerical analysis of soil development in a chronosequence on Fraser Island, South-eastern Queensland. Aust. J. Soil Res. 24, 321–330. Lutro, O., Nordgulen, Ø. (2004): Oslofeltet, berggrunnskart M 1:250,000. Norges Geologiske Undersøkelse, Trondheim. McKeague, J. A., Brydon, J. E., Miles, N. M. (1971): Differentiation of forms of extractable iron and aluminum in soils. Soil Sci. Soc. Am. Proc. 35, 33–38. Barrett, L. R. (2001): A strand plain soil development sequence in Northern Michigan, USA. Catena 44, 163–186. Mehra, O. P., Jackson, L. M. (1960): Iron oxide removal from soils and clays by a dithionite-citrate systems buffered with sodium bicarbonate. Clays Clay Min. 7, 317–327. Barrett, L. R., Schaetzl, R. J. (1992): An examination of podzolization near Lake Michigan using chronofunctions. Can. J. Soil Sci. 72, 527–541. Mellor, A. (1985): Soil chronosequences on Neoglacial moraine ridges, Jostedalsbreen and Jotunheimen, southern Norway: a quantitative pedogenic approach, in Arnett, R. R., Ellis, S., 2008 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim www.plant-soil.com J. Plant Nutr. Soil Sci. 2008, 171, 483–497 Podzol development with the time in sandy beach deposits 497 Richards, K. S. (eds.): Geomorphology and Soils. George, Allen and Unwin, London, pp. 289–308. Sørensen, R. (1988): In-situ rock weathering in Vestfold, southeastern Norway. Geogr. Ann. 70A, 299–308. Mokma, D. L., Yli-Halla, M., Lindqvist, K. (2004): Podzol formation in sandy soils of Finland. Geoderma 120, 259–272. Sørensen, R., Henningsmoen, K. E., Høeg, H. I., Stabell, B., Bukholm, K. M. (2007): Geology, soils, vegetation and sea levels in the Kaupang area in Skre, D. (ed.): Kaupang in Skiringssal. Kaupang Excavation Project Publication Series, Vol. 1, Aarhus University Press, Aarhus, Denmark, pp. 247–267. Protz, R., Ross, G. J., Martini, I. P., Terasmae, J. (1984): Rate of Podzolic soil formation near Hudson Bay, Ontario. Can. J. Soil Sci. 64, 31–49. Protz, R., Ross, G. J., Shipitalo, M. J., Terasmae, J. (1988): Podzolic soil development in the southern James Bay lowlands, Ontario. Can. J. Soil Sci. 68, 287–305. Righi, D., Huber, K., Keller, C. (1999): Clay formation and podzol development from postglacial moraines in Switzerland. Clay Minerals 34, 319–332. Schülli-Maurer, I., Sauer, D., Stahr, K., Sperstad, R., Sørensen, R. (2007): Soil formation in marine sediments of S-Norway: Investigation of soil chronosequences in the Oslofjord region. Revista Mexicana de Ciencias Geológicas 24, 237–240. Schwertmann, U. (1964): Differenzierung der Eisenoxide des Bodens durch Extraktion mit Ammoniumoxalat-Lösung. Z. Pflanzenernähr. Bodenkd. 105, 194–202. Semmel, A. (1969): Verwitterungs- und Abtragungserscheinungen in rezenten Periglazialgebieten (Lappland und Spitzbergen). Würzburger Geogr. Arb. 26, 1–82. Singleton, G. A., Lavkulich, L. M. (1987): A soil chronosequence on beach sands, Vancouver Island, British Columbia. Can. J. Soil Sci. 67, 795–810. Sondheim, M. W., Standish, J. T. (1983): Numerical analysis of a chronosequence including an assessment of variability. Can. J. Soil Sci. 63, 501–517. Sondheim, M. W., Singleton, G. A., Lavkulich, L. M. (1981): Numerical analysis of a chronosequence, including the development of a chronofunction. Soil Sci. Soc. Am. J. 45, 558–563. 2008 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim Starr, M., Lindroos, A.-J. (2006): Changes in the rate of release of Ca and Mg and normative mineralogy due to weathering along a 5300-year chronosequence of boreal forest soils. Geoderma 133, 269–280. Stützer, A. (1998): Early stages of podzolisation in young aeolian sediments, western Jutland. Catena 32, 115–129. Tamm, O. (1915): Beiträge zur Kenntnis der Verwitterung in Podsolböden aus dem mittleren Norrland. Bull. Geol. Inst. University of Uppsala, XIII, pp. 183–204. Tamm, O. (1920): Markstudier i det Nordsvenska barrskogsområdet. Medd. Statens Skogsförsöksanstalt 17, 49–300. Tamm, O. (1932): Über die Oxalatmethode in der chemischen Bodenanalyse. Medd. Statens Skogsförsöksanstalt Exkursionsledare 27, 1–20. Tonkin, P. J., Basher, L. R. (2001): Soil chronosequences in subalpine superhumid Cropp Basin, western Southern Alps, New Zealand. N. Zeal. J. Geol. Geophys. 44, 37–45. VandenBygaart, A. J., Protz, R. (1995): Soil genesis on a chronosequence, Pinery Provincial Park, Ontario. Can. J. Soil Sci. 75, 63–72. Walker, P. H., Green, P. (1976): Soil trends in two valley fill sequences. Aust. J. Soil Res. 14, 291–303. Zech, W., Wilke, B.-M. (1977): Vorläufige Ergebnisse einer Bodenchronosequenzstudie im Zillertal. Mitteilgn. Dtsch. Bodenkundl. Gesellsch. 25, 571–586. www.plant-soil.com
© Copyright 2026 Paperzz