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Study on Estimation for FPAR of Typical Steppe Based on the Different Vegetation Index

WANG Bao-lin;YANG Yong;ZHENG Shu-hua;LIU Ai-jun;Institute of Grassland Survey and Planning of Inner Mongolia;Inner Mongolia Agricultural University;  
The FPAR was inversed based on 8commonly used vegetation indexes.The results showed:when leaf area index was bigger(LAI≥0.5),the estimated effect of FPAR calculated by using GNDVI and TSAVR was better,R2 were 0.908 and 0.895,respectively;When leaf area index was smaller(LAI0.5),TSAVR and SAVR could effectively decrease the effect of soil background on image and R2 reach0.819 and 0.807,respectively.The accuracy of estimating FPAR was improved by vegetation index that was built by effectively combining reflectance of red and near infrared.
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