DOI 10.4010/2016.1338 ISSN 2321 3361 © 2016 IJESC Research Article Volume 6 Issue No. 5 Analysis of Effects of Air Pollution on Chlorophyll, Water, Carotenoid and Anthocyanin Content of Tree Leaves Using Spectral Indices Archana R. Mate1, Dr. Ratnadeep R. Deshmukh 2 PG Scholar1, Professor and Head2 Department of CS & IT Dr. Babasaheb Ambedkar Marathwada University Aurangabad, Maharashtra, India [email protected], [email protected] Abstract: This research aims to examine effects of Air pollution on chlorophyll content, water content, carotenoid content, anthocyanin content of tree leaves using spectral indices. There are 4 trees selected for experiment namely Ashoka, Banyan, Neem and Peepal tree. Samples are collected from University Campus (Control area) and Bus Stand area (Polluted area). ASD FieldSpec4 Spectroradiometer is used for collecting spectral reflectance measurement of tree leaves. Spectral indices are used for analysis of spectral signature. Normalized Difference Vegetation Index (NDVI 680), Normalized Difference Vegetation Index (NDVI705), Ratio Vegetation Index (RVI680), Simple Ratio (SR705), Chlorophyll index Red Edge (CIRed Edge) indices are used for estimate chlorophyll content in which RVI680 index is more sensitive to chlorophyll content. Water index (WI), Normalized water index – 1(NWI900), Normalized water index – 2(NWI850), Normalized water index – 3(NWI880), Normalized water index – 4(NWI920)indices are used for estimate water content in which WI index is more sensitive to water content. Carotenoid concentration index (CRI700), Photochemical reflectance index (PRI), Plant senescencing reflectance Index (PSRI), Carotenoid concentration index (RNIR*CRI550), Carotenoid concentration index (RNIR*CRI700) ndices are used for estimate carotenoid content in which RNIR*CRI700 index is more sensitive to carotenoid content. Anthocyanin Reflectance Index (ARI), Modified Anthocyanin Reflectance Index (mARI), Red/Green indices are used for estimate anthocyanin content in which ARIindex is more sensitive to anthocyanin content. Chlorophyll content seemed direct proportion with air pollution excluding Peepal tree. Water content and Carotenoid Content are seemed inverse proportion with air pollution. Anthocyanin content area seemed direct proportion with air pollution. Key Words: Chlorophyll content, Water content, Carotenoid content, Anthocyanin content, Spectral Indices. I. INTRODUCTION Micro Industrialization, monetary development, urbanization and related increment in vitality requests have brought about a significant decay of air quality in creating nations like India. Oxides of nitrogen and sulfur and fly-slag constitute as the significant extents for the vaporous and particulate emanations from commercial enterprises and car. The presentation of these contaminations to the leaves cause a diminishment in the grouping of their photosynthetic colors viz., chlorophyll and carotenoids, which influences the plant efficiency, ermination of seeds, length of pedicles, and number of blooms inflorescence. Chlorophyll content of leaf is a good indicator of photosynthesis activity, nutritional state and mutations, stress, is of special significance to precision agriculture. All green plants have unique spectral features, mainly because of the chlorophyll, water content, carotenoid, Anthocyanin content and other pigments and can together constitute the spectral feature of a plant [1]. Knudson et al. propose that chlorophyll content could be a helpful indicator for the assessment of injury prompted by pollutants. Therefore, Chlorophyll content variation has been utilized as a part of numerous studies with a specific end goal to explore the effects of pollutants on plant [2] - [6]. Feng Zhao 1 et al. work on Detection of Crop Injury from Glyphosate on Soybeanand Cotton Using Plant Leaf Hyperspectral Data. They use NDVI (Normalized Difference International Journal of Engineering Science and Computing, May 2016 Vegetation Index), RVI (Ratio Vegetation Index), SAVI (Soil Adjusted Vegetation Index), and DVI (Difference Vegetation Index) for detect crop injury [7]. Chlorophyll concentration of a leaf is strongly affected by numerous external factors, for ex. Light and pollutants etc. Mehmet saylmkaracan found chlorophyll content of buxussempervirens and euonymus japonica leaves in different localities and analyse the effect of air pollutions due to vehicle traffic and rural have compared throught eight month between October/2002 and May/2003 [8]. Chaoyang Wu a et al. use different vegetation indices namely normalized difference vegetation index (NDVI), modified simple ratio (MSR) index and the modified chlorophyll absorption ratio index (MCARI, TCARI) estimate chlorophyll content [9] . Alex S. Olpenda1 and Enrico C. Paringit also use vegetation indices RVI, NDVI, DVI including Red Edge Parameter (REP) to assess the effects of air pollution on potted bougainvillea plants [10]. Jan-Chang CHEN1 et al. seemed index mNDVI705 is more sensitive to detecting chlorophyll content in a wide range of tree species across a terrain. They are shown that among the indices tested, mNDVI detects the best in different terrain vegetation reflection [11]. C. Lin et al. evaluate chlorophyll concentrations of fresh and water-stressed leaves . They show that total concentration of chlorophyll a and b decreases because of Water deficits and Red edge characteristics, such as position and reflectance are sensitive to water stress [12]. 5465 http://ijesc.org/ Researches [13] – [18] use indices for chlorophyll estimation based on reflectance at 550 nm and/or around 700 nm and showed good result in Chlorophyll estimation. DrissHaboudane et al. was usedseveral combined indices to test and evaluate chlorophyllcontent using hyperspectral imagery [19].Qiu-xiang Yi et al. performed two band combinations of ratio type of vegetation index (RVI) and the normalized difference type of vegetation index (NDVI) on cotton leaf using spectral reflectance. The results shown that the new index DR1647/DR1133 good for EWT estimation and DR1653/DR1687 good for FMC estimation which is developed using two-band combinations [20]. Penuelas et al. use Water Index WI (R900/R970) for estimation of plant water concentration (PWC) by groundbased, reflectance measurements. When normalizing WI by NDVI the correlations increased. They show that plant reflectance at 680, 900, and 970 nm could speed up the measurement of PWC [21]. Penuelas and Inoue show that the ratio of WI/NDVI (WI=R900/R970, NDVI=(R900-R680) / (R900+R680) also used to predict the water content of plant [22]. E. Raymond Hunt determine leafRelative Water content (RWC) of different specieswith different leaf morphologies by testing the ability of the LeafWater Content Index (LWCI) [23]. M. A. Babar et al. develop two new indices normalized water index-1 [NWI-1] and normalized water index-2 [NWI2]) for estimating water status in crop leaf. The NIR-based index (NWI-2) showed a very high efficiency in selecting superior genotypes in different experiments [24]. B. Prasad et al. develop two more normalized water indices (NWI-3 and NWI-4) and were shown to detect a significant proportion of the highest yielding genotypes and an equal, or higher, correlated response than direct response for grain yield in winter wheat rain fed environments [25]. Several researchers have successfully estimated Carotenoid in vegetation using visible ratios [26], visible/NIR ratios [27] - [29], red edge reflectance-ratio indices [21], [28], [30] –[32], spectral and derivative red edge indices [33] and for forest canopies, scaling-up and model inversion methods with narrow bands are used [34]. Daniel A. Sims and John A. Gamon proved that carotenoid/chlorophyll ratios was related to the photochemical reflectance index (PRI) which is developed for estimate xanthophyll cycle pigment changes in green leaves. They also used PSRI index for estimate carotenoid content [35]. The anthocyanin is common pigments in higher plants. Gamon and Surfus suggested using a red/green index, a ratio of reflectance in the red and the green spectral bands, to estimate Anthocyanin content [15]. The ρred /ρgreen ratio estimates Anthocyanin content by comparing reflectance in the red region of the spectrum to reflectance in the green region where both Chlorophyll and Anthocyanin absorb. ARI index was used to estimate Anthocyanin content [28]. For determining leaf Anthocyanin content nondestructively, several vegetation indices were designed. These indices are based on reflectance in a few spectral bands with varying levels of sensitivity to changes in Anthocyanin content as well as to the content of other pigments. Anatoly A. Gitelson et al. estimate anthocyanin contents using ARI, mARI and Red/Green index [36].Gitelson,A. A et al. develop modified anthocyanin reflectance index (mARI) presented as the conceptual model for Anthocyanin estimation [37]. II. MATERIALS AND METHODOLOGY 2.1 Study Area The leaf samples of four species given in table 1 used in this study were collected from Dr. Babasaheb Ambedkar Marathwada University and Bus Stand Area of Aurangabad city which is one district of Maharashtra state in western India. Aurangabad is located at 19° 53' N and 75° 23' E. The annual mean temperature at the study area range from 17 to 33 °C and average annual rainfall is 710 mm. Aurangabad is connected by roads with various cities of Maharashtra and other states. From Dhule to Solapur, 211National Highway passes through the city. Aurangabad has road connectivity to Pune, Ahmednagar, Nagpur, Jalna, Beed, Mumbai and the path are presently four lane street. Another Nagpur–Aurangabad–Mumbai highway is additionally being created. The city is presented with two bus stations specifically Central Bus stand and CIDCO bus stand, situated around 6 km far from each other. Aurangabad is 17th most polluted city in India. Table 1: Tree species used in this study Tree Species Common Names Family Botanical Names Ashoka Leguminosae SaracaIndica Banyan Moraceae FicusBenghalensis Neem Meliaceae AzadirachtaIndica Peepal Moraceae FicusReligiosa International Journal of Engineering Science and Computing, May 2016 5466 2.2 Plant Material and Reflectance Measurement There are 4 species, namely Ashoka, Banyan, Neem, Peepalare used in this study. Tree leaf samples are collected from the two types of Area University Area (Control Area) and Bus Stand Area (Polluted Area). From each area, 5 leaves of each tree are for reflectance measurement. The ASD Fieldspec 4 Spectroradiometer is used for spectral reflectance measurement. Each leaf from polluted area is cleaned with wet cotton and then reflectance measurements are taken. The sampling interval at the spectral range (350-1000nm) is 1.4nm and at the spectral range (1000-2500nm) is 1.1nm. The height of the light source is 44.5 cm, Gun height is 5 cm and distance between light source and the gun is 50cm. Samples are collected on 22/04/2016 at 10.30 and reflectance measurement are taken between 11.30 Am to 1.30Pm. 8o Field Of View (FOV) is used and room temperature is maintained 23oC when taking spectral reflectance. Length of Ashoka tree leaf is 15-18 cm and width is 2.30-3 cm. Length of Banyan tree leaf is 13-18 cm and width is 7-12 cm. Length of Neem tree leaf is 6-8 cm and width is 2-3 cm. Length of Peepal tree leaf is 15-18 cm and width is 12-15 cm. Spectral reflectance of samples are captured using RS3 Software. 2.3 Spectral Indices ViewSpecPro Software is used for Data Analysis. Spectral reflectance captured by RS3 gives input to ViewSpecPro Software. Mean value calculated using 5 leaf of every tree from each area. Table2 shows the spectral indices used in this study. Spectral indices applied on Mean value. III. RESULT AND DISCUSSION Figure 1 shows the Mean reflectance of all trees. The blue line shows reflectance of leaf collected from university area and pink line shows the reflectance of leaf collected from Bus Stand area. http://ijesc.org/ Table 2: Spectral indices used in this study Content Index Name Normalized Difference Vegetation Index Chlorophyll Water Carotenoid Anthocyanin Index Abbreviation NDVI680 Index calculation Reference [7] Normalized Difference Vegetation Index Ratio Vegetation Index NDVI705 [38] RVI680 [7] Simple Ratio SR705 [38] Chlorophyll index Red Edge Water index CI red edge [29] WI [21], [39] Normalized water index - 1 NWI-1 [24], [40] Normalized water index - 2 NWI-2 [24], [40] Normalized water index - 3 NWI-3 [40], [41] Normalized water index - 4 NWI-4 [40], [41] Carotenoid concentration index CRI 700 [27,28] Photochemical reflectance index Plant senescencing reflectance Index Carotenoid concentration index Carotenoid concentration index Anthocyanin Reflectance Index PRI [35] PSRI [35] [27;28] [27,28] ARI [37] Modified Anthocyanin Reflectance Index mARI [37] Red / Green Red / Green [37] Ashoka International Journal of Engineering Science and Computing, May 2016 Banyan 5467 http://ijesc.org/ Neem Peepal Figure 1: Mean reflectance of Trees. 3.1 Statistical Analysis: In Ashoka and Banyan leaf reflectance of university area is higher in all regions than leaf reflectance of Bus Stand Area. Table 3 shows statistical calculation of different band for trees.For Ashoka, Banyan, Neem tree in all band Control area has higher reflectance of Min, Max, Mean than Polluted area. For Ashoka tree and Banyan tree in Red, Green and NIR band Control area has high reflectance of STDEV than polluted area. In Blue band Ashoka tree has high reflectance of STDEV in Control area and low reflectance in Polluted area but for Banyan tree reflectance of STDEV reflectance is equal in both areas. In Blue band Neem tree reflectance of STDEV reflectance is equal in both area but for Red, Green, NIR band has low reflectance of STDEV in Control area and high reflectance in Polluted area. For Peepal tree in Blue band Min, Max, Mean reflectance are high in Control area and low in polluted area but STDEV reflectance is low in Control Area and high in Polluted area. In Red band Min reflectance is high in Control area and low in Polluted area but Max, Mean, STDEV reflectance are low in Control area and high in Polluted area. In Green band all Min, Max, Mean and STDEV reflectance are low in Control area Tree Name Ashoka Banyan Neem Peepal Band Blue Red Green NIR Blue Red Green NIR Blue Red Green NIR Blue Red Green NIR Min 0.151 0.156 0.157 0.244 0.149 0.164 0.162 0.315 0.104 0.118 0.116 0.170 0.126 0.133 0.125 0.249 and high in Polluted area. In NIR bad Min reflectance is high in Control area and low in Polluted area but Max, Mean, STDEV reflectance are high in Control area and low in Polluted area. 3.2 Analysis using Spectral Indices Chlorophyll Content Analysis Table 4shows chlorophyll content estimation using spectral indices. For Ashoka, Banyan and Neem tree indices values are low in control area and high in polluted area. But in Peepal tree indices values are high in control area and low in polluted area. RVI680 index have maximum values and NDVI705 index have minimum values[11]. For Ashoka tree using NDVI680 ,NDVI705, RVI680, SR705, CI Red Edge indices, it is found that Polluted area has 0.076, 0.073, 1.497, 0.419, 0.285 more chlorophyll content than Control area respectively. Using same indices, Polluted area has more chlorophyll content for Banyan tree are 0.065, 0.081, 1.141, 0.348, 0.243 and for Neem tree 0.051, 0.021, 1.148, 0.130, 0.059 more chlorophyll content than Control area respectively. Table 3: Statistical Analysis of this Study Control Area Max Mean STDEV Min 0.156 0.152 0.001 0.090 0.232 0.202 0.023 0.092 0.244 0.173 0.016 0.090 0.743 0.708 0.077 0.147 0.164 0.153 0.003 0.082 0.280 0.238 0.035 0.096 0.315 0.195 0.030 0.096 0.744 0.702 0.060 0.197 0.118 0.113 0.005 0.080 0.170 0.147 0.016 0.090 0.170 0.125 0.010 0.089 0.629 0.594 0.075 0.149 0.133 0.127 0.001 0.090 0.252 0.206 0.036 0.129 0.249 0.154 0.025 0.138 0.693 0.653 0.063 0.321 Polluted Area Max Mean 0.092 0.090 0.139 0.120 0.147 0.101 0.602 0.565 0.096 0.087 0.181 0.150 0.197 0.117 0.580 0.543 0.090 0.086 0.141 0.119 0.149 0.098 0.618 0.580 0.129 0.105 0.272 0.231 0.321 0.193 0.645 0.611 STDEV 0.000 0.014 0.010 0.076 0.003 0.025 0.020 0.055 0.003 0.016 0.011 0.077 0.009 0.042 0.040 0.046 *Ranges of Bands- Blue Band :400 nm-500 nm, Red Band : 500 nm-600 nm, Green Band 600 nm-700 nm, NIR(Near Infrared) Band 700 nm-1300 nm. International Journal of Engineering Science and Computing, May 2016 5468 http://ijesc.org/ But for Peepal tree using same indices, found that Polluted area has 0.066, 0.136, 1.101, 0.514, 0.343 less chlorophyll content than Control area respectively. Figure 2shows graphical representation of chlorophyll content using spectral indices. Table 4: Chlorophyll content of trees Tree Spectral Control Area Polluted Area Name Indices (University (Bus Stand Campus) Area ) NDVI680 0.640 0.716 NDVI705 0.373 0.446 Ashoka RVI680 4.557 6.054 SR705 2.189 2.608 CI Red Edge 1.831 2.116 NDVI680 0.630 0.695 NDVI705 0.277 0.358 Banyan RVI680 4.409 5.550 SR705 1.765 2.113 CI Red Edge 1.521 1.764 NDVI680 0.675 0.726 NDVI705 0.429 0.450 Neem RVI680 5.145 6.293 SR705 2.505 2.635 CI Red Edge 2.058 2.117 NDVI680 0.685 0.619 NDVI705 0.335 0.199 Peepal RVI680 5.349 4.248 SR705 2.010 1.496 CI Red Edge 1.686 1.343 Water Content Analysis Table 5shows water content estimation using spectral indices. Table 5: Water content of trees Tree Species Ashoka Banyan Neem Peepal Indices Control Area (University Campus) WI NWI900 NWI850 NWI880 NWI920 WI NWI900 NWI850 NWI880 NWI920 WI NWI900 NWI850 NWI880 NWI920 WI NWI900 NWI850 NWI880 NWI920 1.007 0.003 0.001 -0.003 -0.004 1.035 -0.017 -0.013 -0.016 -0.016 1.008 -0.004 0.002 -0.002 -0.006 1.032 -0.016 -0.013 -0.016 -0.016 Polluted Area (Bus Stand Area) 0.997 0.003 0.012 0.005 0.000 1.031 -0.015 -0.011 -0.014 -0.015 1.005 -0.002 0.005 0.000 -0.004 1.003 -0.002 0.006 0.001 -0.003 Figure 2: Graphical representation of Chlorophyll Content of Ashoka, Banyan, Neem, Peepaltrees International Journal of Engineering Science and Computing, May 2016 5469 http://ijesc.org/ Figure 3: Graphical representation of Water Content of Ashoka, Banyan, Neem, Peepaltree For all trees WI index values are high in Control area and low in Polluted area. But NWI900, NWI850, NWI880, NWI920 indices have low values in Control area and high value in Polluted area. WI index high value indicates high water content in tree leaf and low value indicates low water content in tree leaf [24] but lowest values for NWI900, NWI850, NWI880, NWI920 indices indicates high water content and high value indicates low water content in tree leaf [25] . For Ashoka tree using WI, NWI900, NWI850, NWI880, NWI920 indices, it is found that Polluted area has 0.01, 0, 0.011, 0.008, 0.004 less water content than Control area respectively. Using same indices, Polluted area has 0.004, 0.002, 0.002, 0.002, 0.001 for Banyan tree, for Neem tree 0.003, 0.002, 0.003, 0.002, 0.002 and for Peepal tree 0.029, 0.014, 0.019, 0.017, 0.013 less water content than Control area respectively.Figure 3shows graphical representation of water content using spectral indices. Carotenoid content Table 6shows water content estimation using spectral indices. For all trees, CRI700, PRI, PSRI, RNIR*CRI550,RNIR*CRI700 indicesvalue are low in Control area and high in Polluted area. For all indices low values indicates high carotenoid content and high value indicates low carotenoid content in tree leaf[25]. International Journal of Engineering Science and Computing, May 2016 Table 6: Carotenoid content of trees Tree Species Ashoka Banyan Neem Peepal 5470 Indices CRI700 PRI PSRI RNIR*CRI550 RNIR*CRI700 CRI700 PRI PSRI RNIR*CRI550 RNIR*CRI700 CRI700 PRI PSRI RNIR*CRI550 RNIR*CRI700 CRI700 PRI PSRI RNIR*CRI550 RNIR*CRI700 Control Area (University Campus) 1.716 0.008 0.000 3.072 3.233 2.033 -0.028 0.000 3.044 3.342 1.931 0.010 -0.002 4.740 4.760 2.195 -0.011 -0.011 4.189 4.169 Polluted Area (Bus Stand Area) 2.812 0.009 0.003 6.349 6.585 3.327 -0.003 0.008 6.248 6.508 3.190 0.016 0.004 6.640 6.848 2.665 0.008 0.021 4.290 4.639 http://ijesc.org/ For Ashoka tree CRI700, PRI, PSRI, RNIR*CRI550, RNIR*CRI700 using indices, it is found that Polluted area has 1.096, 0.001, 0.003, 3.277, 3.352 less carotenoid content than Control area respectively. Using same indices, Polluted has 1.294, 0.025, 0.008, 3.204, 3.166 for Banyan tree, for Neem tree 1.259, 0.006, 0.006, 1.9, 2.088 and for Peepal tree 0.47, 0.019, 0.032, 0.101, 0.47 less carotenoid content than Control area respectively.Figure 4shows graphical representation of carotenoid content using spectral indices. Anthocyanin content Analysis: Table 7shows anthocyanin content estimation using spectral indices. ARI, and mARI, Red/Green, were calculated using average reflectance values in following bands Green = 540 – 560 nm, Red = 660 – 680 nm, Red Edge = 690 – 710 nm, NIR = 760 – 800 nm. For all trees ARI and mARI indices values are low in Control area and high in Polluted area. But Red/Green index have high values in Control area and low value in Polluted area. Higher values for ARI and mARI indices indicates high anthocyanin content and low valuesindicates low anthocyanin content in tree leaf but for Red/ Green index high value indicates low Anthocyanin content in tree leaf and low value indicates high anthocyanin content in tree leaf [36]. Table 7: Anthocyanin content of trees Tree Species Ashoka Banyan Neem Peepal Indices ARI mARI Red/Green ARI mARI Red/Green ARI mARI Red/Green ARI mARI Red/Green Control Area (University Campus) 0.399 0.282 0.690 0.468 0.333 0.594 0.334 0.195 0.690 0.079 0.052 1.968 Polluted Area (Bus Stand Area) 0.794 0.430 0.659 0.612 0.335 0.542 0.774 0.433 0.643 0.546 0.321 0.537 For Ashoka tree using ARI, mARI, Red/Green indices, it is found that Polluted area has 0.395, 0.148, 0.031 more anthocyanin content than Control area respectively. Using same indices, Polluted area has 0.144, 0.002, 0.052for Banyan tree, for Neem tree 0.44, 0.238, 0.04, 0.047 and for Peepal tree 0.467, 0.269, 1.431 more anthocyanin content than Control area respectively.Figure 5shows graphical representation of anthocyanin content using spectral indices. Figure 4: Graphical representation of Carotenoid of Ashoka, Banyan, Neem, Peepaltrees International Journal of Engineering Science and Computing, May 2016 5471 http://ijesc.org/ Figure 5: Graphical representation of Anthocyanin Content of Ashoka, Banyan, Neem, Peepaltrees [3] Kobriger, J. M. and T. W. Tibbitts, (1985). “Effects of relative humidity prior to and during exposure on IV. CONCLUSION response of peas to ozone and sulfer dioxide.” Journal of Chlorophyll content seemed direct proportion with air American Society for Horticultural. Science Vol. 110, pollution excluding Peepal tree. Water content and Carotenoid pp. 21-24. Content are seemed inverse proportion with air pollution. 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