195 Oral Histories and Scientific Knowledge in Understanding Environmental Change: a case study in the Tumut Region, NSW RUTH LANE What can professional land managers gain by consulting with local communities? Scientific knowledge provides valuable insights into the causes of environmental change and the processes by which it occurs but often lacks a historical dimension. Recollections of local people can supplement both historical records and scientific understandings of cause and process to achieve a more comprehensive picture of change over time. However, the process of memory is tied to life experience and is highly selective. Any attempt to use oral accounts in constructing a picture of environmental change over time must also include an analysis of the process of memory itself. Drawing on oral histories with long term residents of the Tumut region of NSW, this paper explores the nature of local environmental knowledge and evaluates oral history as a source of information for understanding environmental history and the impact of changing patterns of land use. In a recent issue of this journal, Finlayson and Brizga (1995) warn that oral sources may contain major misconceptions of past environments and describe examples of poor land management decisions based on oral traditions that enshrined gross misunderstandings within the locally accepted version of environmental history. Their study provides a valuable cautionary tale, but should not divert attention from the potential of local knowledge, used appropriately, to provide valuable information that can inform and extend Ruth Lane is curator, People’s Interaction with the Australian Environment, National Museum of Australia, GPO Box 1901, Canberra, ACT 2601. professional knowledge bases in ways that other sources cannot. This paper examines the uses of oral history in understanding the patterns of environmental change in the Tumut region of New South Wales and the responses of local people to change. The high country just to the east of Tumut is typical of the kind of country on the western slopes of the Australian Alps, and the history of land use change in the Tumut region has many parallels throughout the Southern Tablelands. Two specific localities, Tumorrama and Argalong, are examined in more detail. Of the two, Argalong is steeper and less accessible country which pastoralists were slower to occupy than Tumorrama and had less incentive Australian Geographical Studies • July 1997 • 35(2):195-205 196 to clear land. However, in both places the greatest change to land use within memory is the dramatic expansion of softwood plantations since the 1960s. I recorded oral history interviews with five people who lived on properties in this region. For the purposes of this study, local knowledge took the form of recollections of watercourses, weeds and climate at earlier times which were compared with the present day environment. I also spoke with a wide range of people, both land owners and non-land owners and gained a more general appreciation of local perspectives on environmental change. Of the five cited here, only two still lived on the land that they owned. The others had all moved to Tumut but still retained strong feelings for the country they used to live in. I first spoke with them at their homes, then arranged to drive with them through the country where they used to live, asking each person to describe how features of his or her environment had changed over time. The expansion of softwood plantations brought many changes to the lives of local people and features strongly in their comments about environmental change. Watercourses Watercourses have always been a focus for human activity in this area. In the early years of European settlement the Tumut River was used by three different Aboriginal groups, the Wiradjuri, Ngunuwal and Walgalu and may have formed a route for travelling to the Snowy Mountains during summer for the Bogong moth feasts (Bennett, 1834:265–7; Kaminga, 1992:107; Flood, 1980:61). Early gold mining along creeks in the higher country influenced the location of roads and settlements (Hancock, 1972:134). Stock routes also followed watercourses wherever possible and some of these, such as the old Argalong stock route, have now been replaced by roads. Mark Garner related stories passed on to him by older relatives indicating that pastoralists at Tumorrama assisted the process of channel incision by digging channels through swampy Australian Geographical Studies depressions. He understood that it was a deliberate strategy to increase the area of fertile grazing lands in the basins of creeks and described the method used. A heavy log was hitched to a team of bullocks and dragged through a swamp until water flowed freely through the channel created. According to Mark, the creeks at Tumorrama remained much the same until recent years: And the channels were about three foot wide and three foot deep. And they stayed like that for many many years until just recently . . .1 He attributes the recent changes to the impact of pine plantations: ’But now since the Forestry got there those creeks are eroding and getting deeper and deeper. And there’s enormous holes and the sides are broken in in lots of places, lots of places they haven’t they’re still the same . . .2 Jack Herlihy remembered Little Sandy Creek as a swamp before it was drained by a local farmer, probably in the 1930s.3 Waterholes had a particular place in people’s memories. Most people carried fond memories of swimming in them as children or of teaching their own children to swim. Waterholes were also prime places for trout fishing, a popular recreation for most people. According to my informants, many of these waterholes had disappeared in recent years. Sheila Garner pointed out that the waterholes on the Adjungbilly Creek, where she taught her children to swim in the 1960s, had disappeared entirely. Beryl Margules grew up at Tumorrama and lived there until the 1970s. She never married and assisted her father with the management of the family’s hardwood mill and their property which she eventually inherited. In the photograph in Figure 1 she is pointing to where the swimming hole in the Shaking Bog Creek used to be before it silted up. It was not far from her home and used to be the family’s regular swimming spot. Beryl attributed its disappearance to erosion of the banks upstream ß Institute of Australian Geographers 1997 Oral Histories and Scientific Knowledge 197 Fig. 1 Beryl Margules pointing out where the water hole used to be on Shaking Bog Creek but did not comment on the cause of this erosion. Hazel Herlihy came to Argalong as a school teacher in the 1940s, married into a large landholding family and raised two children during the 1940s and 1950s. She made similar comments about the silting of creeks at Argalong since the pines were planted. She was always keen on fishing and spent a lot of time along the creeks and, like Beryl Margules, explained that many of the water holes she used to fish in had disappeared. Hazel Herlihy recalled a particular incident from the 1950s when her young daughter made a dangerous crossing of Little Sandy Creek when it was in flood. She then explained that such floods have not occurred for many years and related this to reduced surface water run off from the pine plantations (Fig. 2). Hazel’s brother-in-law, Jack Herlihy, still lived on the land he inherited from his parents, not far from Hazel. Jack and Hazel were the last remaining land holders at Argalong as everyone else had sold out to the NSW Forestry Commission or private softwood companies. Jack Herlihy also described a dramatic decrease in flow in Big Sandy creek since the pines were planted and claimed that it had dried out for the ß Institute of Australian Geographers 1997 first time in memory during the 1982 drought.4 Sheila Garner went to school at Argalong in the 1930s. When she returned there recently for a reunion she was totally disoriented among the pines. She could hardly recognise Big Sandy Creek because it had become much smaller and narrower.5 Her husband Mark Garner came from one of the older landholding families in the Tumorrama district and remembered fishing in the creeks as a child in the 1930s. He and Sheila raised their children at Tumorrama in the 1960s (Fig. 3). Mark Garner thought that the water flow in the creeks at Tumorrama had decreased: . . . I’m quite convinced that Tumorroma Creek and Adjungbilly Creek and the portion that goes through Tumorroma . . . it used to be almost a river. It was beautiful spread, and now you could step over it anywhere.6 He also thought that Tumorrama Creek and Fairview Creek, both minor tributaries of Adjungbilly Creek, had become silted from run off from Forestry roads And the siltation of those, and the colour of the water has deteriorated something terrific. And one time it used to be beautiful clean, it was like gin the water. Now you don’t see 198 Australian Geographical Studies Fig. 2 The entire catchment of Greens Creek at Argalong has been planted with pines Fig. 3 Sheila and Mark Garner at Tumorrama that no more, and that’s through roads being put through Forestry and put through areas, and run off. It’s eventually got down into the creeks and caused this.7 The following table summarises all the comments relating to changes to creeks obtained in the study including those discussed above. In short, there was a large degree of consensus among those interviewed about changes to the creeks in this country, suggesting that creeks with catchments planted to pine trees have become silted and in some cases have a reduced flow and that most of this change has occurred since the 1960s. However, there are some difficulties in interpreting these observations. Mark Garner, made two seemingly contradictory statements, on the one hand observing that creeks had become narrower and deeper and on the other, that bank ß Institute of Australian Geographers 1997 Oral Histories and Scientific Knowledge 199 Table I. Summary of Comments about Changes to Creeks Tumorrama MG* • • • • • • • • • • • BM • Creeks were first altered in mid 19th century by early settlers who made channels to drain swamps Gold mining on Shaking Bog & Adjungbilly Creeks in 19th century Recently creeks have got narrower & deeper Erosion of banks Decrease in flow in tumorrama and Adjungbilly Creeks Siltation of Tumorrama and Fairview Creeks Banks are eroding and large holes are forming Shaking Bog Creek has silted up since the 1960s and big holes that used to be there have filled with sand The upper part of Shaking Bog Creek has silted up Adjungbilly Creek has become discoloured from erosion from roads The swimming hole in Adjungbilly Creek where the Garners’ children used to swim in the early 1960s has become too shallow to swim in now Swimming holes in Shaking Bog Creek have silted up since 1960s due to erosion of banks upstream Argalong HH JH • • • • • • • • • • SG • Disappearance of water holes since 1950s Silting of creeks since 1950s Greens Creek has less flow than it did in the 1950s Decline in flooding since 1950s Jack’s father & brothers did a lot of clearing of country in the area (early 20th century?) Little Sandy Creek used to be a swamp but was drained by Joe Whiting early this century (1930s?) Little Sandy Creek has now silted up Decrease in flow in Big Sandy Creek since 1950s Creek that house water supply comes from now dries up but never used to Dog Creek hasn’t changed much & has always kept running year round Big Sandy Creek has become smaller and narrower with less flow Interviewees: *MG = Mark Garner; BM = Beryl Margules; HH = Hazel Herlihy; JH = Jack Herlihy; SG = Sheila Garner. erosion had caused enormous holes in some places. Some creeks, such as the Adjungbilly Creek have very large catchments and it is difficult to typify the changes that have occurred within their catchments. Others such as Little Sandy Creek at Argalong have a much smaller catchment and changes to land use and vegetation cover are easier to typify. The more useful comments are those which are more specific about geographic locations. Scientists at the CSIRO Division of Water Resources and the NSW Soil Conservation Service are attempting to reconstruct the history of watercourses on the southern tablelands since the arrival of the first ß Institute of Australian Geographers 1997 European pastoralists. They are interested in the evidence contained in historical records and some are exploring the value of oral accounts (Starr, 1989, 1992) Historical information is related to an analysis of sediment layers in creeks. From this and related work, there is increasing evidence that the first forty years (in some cases the first ten years) of European pastoral land use was the period when the most dramatic changes to watercourses occurred (Wasson, pers comm). Based on descriptions made by early explorers and survey plans, the pre-European pattern for creeks on the Southern Tableland seems to have been strings of water holes and swamps connected by 200 discrete channels (Eyles, 1977; Wasson et al., in press). By the turn of the century, these had become strongly incised channels and the water holes and swamps had disappeared (Eyles, 1977, Wasson et al., in press; Starr, 1989). Sometimes the draining of these creeks was deliberately assisted by a driving a plough through to make the water flow (Starr, 1989). Mark Garner’s observations suggest that a similar process of deliberate channel incision took place at Tumorrama during the nineteenth century. Jack Herlihy remembered Little Sandy Creek being a ‘swamp’ before it was drained in the early twentieth century. Channel incision is usually associated with extensive erosion of the banks of the deeper channels, resulting in the deposition of eroded sediments downstream causing silting. Detailed studies of Michelago and Jerrabomberra Creeks near Canberra indicate that the main period of channel incision occurred prior to 1900 (Starr, 1989, Wasson et al., in press). Wasson et al. (in press) compare these studies with evidence from alluvial sediments and air photographs and suggest that for many creeks in the Southern Tablelands changes since the turn of the century have been relatively minor and that these creeks may now be reaching an equilibrium state. It is reasonable to conjecture that the changes to creeks in the Tumut region in the early years of European settlement reflected this same pattern (see Wasson et al., in press; Starr, 1989 etc.). If this was the case then channel incision would have been the most important form of erosion during the nineteenth century with the most significant changes to channels taking place between 1850 and 1900 (Wasson et al., in press). At Tumorrama, pastoral land use followed soon after the discovery of gold in the creeks during the 1850s, and the first country to be taken up was the basins of the creeks. Burning, grazing and clearing probably increased the volume of run off from the catchment into these creeks. This, combined with the impact of livestock trampling the ground along the banks of watercourses, would Australian Geographical Studies have led to channel incision (Wimbush and Costin 1983). At Argalong, where pastoralism did not take hold until late in the nineteenth century, these changes may have continued into the early twentieth century. This account complies with the conclusions of Wasson et al. (in press) that channels have been stable for most of this century. However the catchments of Jerrabomberra and Michelago Creeks have remained pastoral land and the channels of these creeks appear to have maintained their stability. The observations of local people in the Tumut region suggest that some of the creeks there have undergone further changes since the 1960s and that these changes may be associated with reafforestation to pine plantations. Some observations suggest a more recent phase of channel incision. The effects of pine plantations on water catchments depend on the nature of the vegetation cover that preceded them (Cornish, 1989:2). We should expect a decrease in run off from catchments that have changed from either cleared pasture land or eucalypt forest, to pine plantations (Cornish, 1989:10; Ryan pers. com.) However, this effect is complicated by the growth stage of the pines as there is greater run off from young plantations than from mature plantations. The comments from my informants about the decrease in stream flow generally, support these predictions. The people I spoke with had quite specific observations of changes to particular creeks. Vegetation change occurred rapidly but not uniformly and it is likely that the creeks have not all changed uniformly either. The observations of local people may be the only source of information that addresses this level of detail. Research by the NSW Forestry Commission indicates that the most significant factor affecting the amount of sediment in streams flowing through pine plantations is the density of access roads and their proximity to watercourses (Cornish, 1989:29). One could also expect to find more sediment at the time of harvesting and re-establishment of plantations. ß Institute of Australian Geographers 1997 Oral Histories and Scientific Knowledge Weeds The spread of various weed species throughout the Tumut region is closely related to the history of land use. Weeds tend to become established on distrurbed land (Humphries et al., 1990:27) and in this region various land use practices have contributed to different forms of soil disturbance over time. Blackberry Rubus fruticosus, patterson’s curse Echium plantagineum, sweet briar Rosa rubiginosa and stinkwort Inula graveolens were probably introduced to the region within the first fifty years after European occupation. The catalogue from a plant nursery at Queanbeyan shows that blackberry, hawthorn Crataegus sp. and other species now regarded as weeds in the district were being sold to landholders for ornamental or other purposes (Mulvaney, 1991, 39). Climatic conditions, together with the land use history in the higher country, have led to a distinctive complex of weed and animal pests common to Tumorrama and Argalong. My informants tended to view the activities of the Forestry Commission as the main cause of increasing problems with weeds, feral animals and kangaroos, however, land clearing for pastoral purposes and the movement of stock may also have played a significant role. 201 The creeks at Tumorrama and Argalong have become choked with blackberry and many of those keen on trout fishing explained that it was now difficult to get near the water because of it. Beryl Margules and Mark Garner both remarked that the blackberry along the banks of Shaking Bog Creek was now protecting the banks from eroding further. Parsons and Cuthbertson (1992:579) note that one of the reasons nineteenth century acclimatisation societies advocated the planting of blackberry was to assist in reducing erosion of stream banks. Most of the comments my informants made about St John’s wort and blackberry associated their spread with the activities of the Forestry Commission. Jack Herlihy claimed that weeds were spread by water draining from pine plantations at Argalong and that the hip gutters, put in by Forestry as an erosion control measure, carried seeds which then spread downstream (Fig. 4). Beryl Margules expressed concern that both St John’s wort and blackberries have spread since the 1960 and although she did not relate this directly to pine plantations, it was the period of the expansion of plantations at Tumorrama. In the Tumut region, private landholders are obliged by law to spray blackberry, St John’s Fig. 4 Jack Herlihy walking through blackberry at the site of the old school ground at Argalong ß Institute of Australian Geographers 1997 202 wort and other noxious weeds when they appear on their properties. Consequently, considerable resentment was directed at the neglect of weed problems by government landholders such as the Forestry Commission. New harvesting machinery which can operate regardless of severe weed infestations has removed some of the economic incentive for the Forestry Commission to eradicate weeds. Surveys of community responses to pine plantations conducted for the State Plantations Impact Study in Victoria also confirmed that this was a concern of people living adjacent to pine plantations (Centre for Farm Planning and Land Management, 1989:142–144). It should be noted, however, that my informants made similar complaints about the spread of weeds and animal pests in the nearby Kosciusco National Park. Most of them were less sympathetic to land use for forestry or national parks than to pastoral land use and were therefore more likely to level blame at the management of these areas than of pastoral lands. Pine plantations are associated with a regime of environmental disturbance, in the form of road building, planting, thinning and harvesting which may contribute to weed infestations. Roads play a significant role in the spread of weeds. Not only are they a form of disturbance, they are also exposed to seeds which are transported in the mud on vehicles (Wace, 1988:144, 1977; Humphries et al., 1990:27). Jack Herlihy claimed that St John’s wort was absent from Argalong until the Forestry Commission began planting pines there and suggested that it was introduced with the mud on earth-moving equipment. I also spoke with foresters who thought this was the probable method of introduction, suggesting that the machinery may have picked up seeds while being used in plantations at Tumbarumba where the St John’s wort infestation was very serious.8 Parsons and Cuthbertson (1992:389) recognise that bulldozers can be significant in spreading seeds to new areas. Australian Geographical Studies No research is available on the spread of St John’s wort in pine plantations and it would be difficult to establish whether forestry activities really were responsible for the introduction of St John’s wort at Argalong or if they were the main cause for its spread. An alternative explanation is that it was transported by travelling stock which are still brought into the region during dry years, and that the relationship with pines was coincidental. Seeds adhere to animals and are also transported in their digestive systems, and the weed flourishes on heavily grazed pasture land. It does not grow well in shaded conditions and only flourishes in young stands of pine as older trees generate too much shade. At Mannus, near Tumbarumba, pines were planted in former years as a control measure for St John’s wort. Although blackberry and St John’s wort have both been shown to be transported in mud on vehicles I could not find any studies of the spread of weeds in pine plantations that would give weight to my informants’ claims about a relationship between pine plantations and these weeds. Blackberry and St John’s wort have much more serious consequences for the management of pasture lands than they do for pine plantations and it is clear that this has led to resentment of the Forestry Commission by local landholders. Climate There was a general consensus among the people interviewed that the climate of the Tumut region had become warmer since the 1960s. Many described heavy frosts or snow falls in the past which they had not experienced for several decades. Often they drew upon anecdotal stories about getting caught in a blizzard or having the hot water pipes burst to illustrate the changed climate. Snowfall records show that the 1960s had unusually heavy snow falls (Kesteven, 1989:58). Memories of this period may have become a benchmark for comparison, leading to the view that ‘it doesn’t snow like it used to’. There may also be a bias in memories of past weather patterns due to the ß Institute of Australian Geographers 1997 Oral Histories and Scientific Knowledge fact that my informants were more active and spent more time outdoors in former years than at the time of this study. For those who had ceased farming and moved to Tumut the weather played a less significant role in their lives. Several informants claimed that the sun has more capacity to burn now than it used to. Joan Kell explained: I notice these last two or three years that the sun just seems to pierce the skin. Something to do with the ozone layer they say. . . . It used to be very hot. We didn’t complain about it was summer. But there was no thought of having to protect your eyes from the sun.9 The comments people made in speculating about the cause of the climatic changes they had noticed indicated a concern that this pattern was much wider and could reflect global warming.10 There had been a reasonable amount of publicity about global warming on national television and radio stations and it may be that this was the most readily available explanation for the trend towards milder seasons. In general, the comments local people made about climate did not provide information that could enhance existing climate records. What they did contribute was an understanding of how climate change was perceived and the ways in which it affected local people. At Tumorrama and Argalong, my informants tended to compare the current climate to the 1960s claiming that winters were milder and ‘it doesn’t snow like it used to’. Records show that particularly heavy snowfalls of the 1960s were an aberration to the pattern of snowfall during the life spans of my informants. Droughts were more memorable than good years, particularly when they coincided with economic depression. Discussion Local knowledge appears to be more valuable for some aspects of environmental change than others. In this study, oral accounts suggest ways in which water courses have changed over time, and by implication, the impact that changing ß Institute of Australian Geographers 1997 203 patterns of land use have had on the country. The story of creeks in the Tumut region shows a reasonable degree of compliance between what science predicts and what local people have observed. It also indicates the potential for local knowledge to provide a greater level of detail as well as historical perspectives about how specific places have changed over time. In the absence of other information about the impact of afforestation with pine plantations on stream morphology, my informants’ comments suggest directions for future scientific research. The comments on weeds provided strong indicators as to the periods of introduction and spread of particular species and, in the absence of other kinds of records, were an important source of information. However, attributions of the cause of introduction and spread were impossible to separate from a widely felt antagonism to the Forestry Commission as a land manager in the region. Comments about climate did not provide any information that could enhance existing climate records, only impressions of the impact of climatic factors on daily life. Local people accumulate knowledge about the country from their own experiences and from those of prior generations but the process of memory is tied to life experience and is of necessity highly selective. Attributions of cause seem likely to be influenced by perceptions of the desireability of the land use industry one is associated with as opposed to a new industry that has displaced the former. Dates are rarely remembered with any accuracy unless they relate to specific episodes in which local people were personally involved. Historians have highlighted the role of memory as a social process which helps people to make sense of the past and articulate meanings in their lives (Hamilton, 1994:15; Samuel and Thompson, 1990:10). The features we distinguish in the landscape, the kinds of changes we observe taking place, and our attribution of the causes of change, all relate somehow to who we are and what our life experiences in that place have been. This subjectivity, which often makes oral history 204 unreliable for factual accounts, makes it extremely valuable for comprehending the human impact of environmental changes, the role that local people have played in these changes and reasons for their attitudes and behaviour. Anthropologists have used life history research as a tool for interpretating cultural relationships to land (eg. Basso, 1988, Rosaldo, 1980, Vansina, 1985). When examining the accounts people give of their lives in a particular place over a number of years, it becomes clear that environmental change and social change are intimately connected. The people I spoke with were very willing to divulge what they knew because they still felt strongly about the country. By recording the perspectives of local people and relating them to scientific understandings of the impact of land use change, local knowledge and scientific knowledge can be brought together. The environmental impact of new forms of land use can be better understood and the social impact also becomes clearer. Most of all, environmental change is set in a human context and related to the history of people who have lived in the region. The land use changes occurring now are not an imposition on a stable environment, but a new phase that has come after a succession of human imposed changes to the country. The coupling of local knowledge with scientific knowledge offers an opportunity to gain a more detailed understanding of the history of any particular place and of the impact of land use changes that have taken place within living memory. NOTES 1 Tapes 037–8 MG p. 2–3. 2 Tapes 037–8 MG p.2. 3 Tape 052 JH p.7. 4 Tape 052 JH p.11. 5 Tapes 037–8 SG p.19. 6 Tapes 037–8 MG p.2. 7 Tapes 037–8 MG p.20. 8 Tapes 003 & 004 Group session p.5. 9 Tape 053–4 JK p.17. 10 See also Tape 001 JM p.1. 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