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《Journal of Agro-Environment Science》 2012-12
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Inversion of Chlorophyll-a Concentration Based on TM Remote Sensing Image in Keqin Lake

LI Miao,ZANG Shu-ying,WU Chang-shan(Key Laboratory of Remote Sensing Monitoring of Geographic Environment,College of Heilongjiang Province,Harbin Normal University,Harbin 150025,China)  
The concentration of chlorophyll-a not only reflect the water plankton but also the distribution of primary productivity.The change of concentration is often used as a basic indicator to measure the extent of water eutrophication.In order to investigate the eutrophication of Keqin Lake,chlorophyll-a concentration was inversed based on the quasi-synchronous measured data and Landsat-5/TM image of Keqin Lake.By researching the spectral characteristics of chlorophyll-a,correlation analysis was made between the chlorophyll-a concentration and the 14 kinds of combinations of TM2,TM3 and TM4.Then 3 models were established by results which correlation coefficient were higher.Finally,chlorophyll-a concentration of Keqin Lake was inversed by suitable model which was Y =41.57 ×(TM3 +TM4)-0.697.The results showed that chlorophyll-a concentration of Keqin Lake was relatively low on the whole south lake,high on the north lake and with a increas-ing tendency from south to north,which was consistent with the quasi-synchronous measured data,and actually reflect the eutrophication sit-uation of Keqin Lake.Which caused by there are much cultivated land around north lake,and much reed which can purify the water nearby south lake.The model could accurately estimate chlorophyll-a concentration of Keqin Lake,and could satisfy the requirement for quantitative monitoring of chlorophyll-a concentration.This researching will provid theoretical basis to dynamics monitoring and early warning of water quality.
【Fund】: 国家自然科学基金项目(41030743 41171322);; 黑龙江省高等学校科技创新团队建设计划项目(2010td10)
【CateGory Index】: X832
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