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《Remote Sensing for Land & Resources》 2010-03
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A Comparatively Study of the Capabilities of Different Vegetation Water Indices in Monitoring Water Status of Wheat

WANG Pu,WU Jian-jun,NIE Jian-liang,KONG Fan-ming,DING Hui-yan,ZHAO Liu-hui(College of Resources Science and Technology,Beijing Normal University,Beijing 100875,China)  
Based on comparing the capabilities of different water indices in monitoring water status of wheat,the authors selected the best indices for different periods.Using the data of wheat spectra and water status observed in a whole growth season of wheat,the authors calculated five popular water indices,i.e.,NDVI,NDWI,GVMI,PWI and WI,and conducted a correlation analysis between these indices and EWT(Equivalent Water Thickness) as well as FMC(Fuel Moisture Content).The Results show that,in the early period of wheat growth,FMC is better than EWT in reflecting water status of the wheat,whereas in the late period,EWT is more suitable.Different periods have different best water indices,and the correlation between indices and water status tends to experience an increase in early periods and decrease in later periods.In the application,therefore,we should choose different indices for different periods.
【Fund】: 国家863计划课题“国家统计遥感前沿技术研究与示范应用”(编号:2006AA120108-2)资助
【CateGory Index】: S512.1
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