Abstract
Abstract In the present study, we calculated seven vegetation indices simple ratio [SR], normalized diffe( r-ence vegetation index [NDVI], enhanced vegetation index [EVI], soil-adjusted vegetation index [SA-VI], optimized soil-adjusted vegetation index [OSAVI], land surface water index [LSWI], and green-ery ratio [GR]) based on MODIS surface reflectance data and analyzed the relationships between these indices and the aboveground biomass in semiarid grasslands in Mongolia. The measured values of the biomass for the study area ranged from 7.5 to 137.0 g dry weight dw) m -2 . The results re-(vealed that NDVI, SR, and OSAVI were strongly correlated with the biomass. Among these, NDVI showed the best performance as a proxy of the plant biomass of Mongolian grasslands. The relation-ships of NDVI and OSAVI with the temporal variation and spatial pattern of biomass were statistical-ly similar, suggesting that a single linear equation was appropriate to derive aboveground biomass values from NDVI or OSAVI.
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