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《Geo-Information Science》 2008-03
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Canopy Hyperspectral Characteristics of Paddy Plants Contaminated by Lead

REN Hongyan1,2,3,ZHUANG Dafang1,2,PAN Jianjun1,QIU Dongsheng2,3(1 College of Resource and Environment Science,Nanjing Agriculture University,Nanjing 210095,China;2 Institute of Geographic Sciences and Natural Resources Research,CAS,Beijing 100101,China;3 Key Laboratory of Resources Remote Sensing & Digital Agriculture,Ministry of Agriculture,Beijing 100081,China)  
Increased heavy metal concentrations in cropland soil cause stress on many crops and decline crops′ quality.The objective of this article is to try a new method to monitoring heavy metal pollution in cropland like remote sensing,which can be applied to estimate Pb pollution on paddy plant. Experiment that paddy plants were cultivated in the potted soils manually contaminated by Pb was settled down to investigate the stress caused by Pb absorbed by paddy plants.In the developmental stages of seeding,early tillering,full tillering,jointing and booting,hyperspectral reflectance measurements on paddy plant canopy were done by a hyperspectral radiometer.Meanwhile,we got Pb concentrations in parts of paddy plant,and canopy leaves′ chlorophyll content.Quantitive relationship between Pb concentration in parts of paddy plant,canopy leaves′ chlorophyll content and canopy reflectance was studied.Results showed that chlorophyll content of canopy leaves and composition of chlorophyll,chlorophyll a and b vary obviously under Pb stress.The difference of canopy reflectance at the sensitive bands of 520nm~560nm and 630nm~690nm is most significant,and it differs from the three Pb treatments on rice from each other.Therefore,these spectral regions are validated as sensitive bands to Pb pollution on paddy plants.According to the first(620nm~670nm) and forth channel(545nm~564nm) of MODIS and sensitive band(760nm) in the near infrared region,552nm,672nm and 760nm were selected to construct composite normalized difference pollution index(CNDPI).CNDPI discriminates all the three Pb contamination levels of paddy plants.At the early tillering stage,the canopy hyperspectral reflectance and CNDPI distinguish Pb pollution condition commendably.Therefore,monitoring Pb pollution on paddy plants with remote sensing data of raw canopy reflectance and CNDPI at the early tillering stage is a potential solution and new reference for heavy metal pollution condition monitoring technology.
【Fund】: 中国科学院知识创新工程重要方向项目(KZCXZ-YW-313);; 农业部资源遥感与数字农业重点实验室开放基金O6L60260AJ
【CateGory Index】: S511
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