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An attempt has been made in this study to delineate the characteristics of spectral signatures of the vegetation in terms of various vegetation indices (VIs), particularly the Normalized Difference Vegetation Index (NDVI), Modified Soil Adjusted Vegetation Index2 (MSAVI2) and Enhanced Vegetation Index (EVI) to manifest their ability to estimate vegetation biomass over a large area and to monitor vegetation degradation in arid and semi‐arid area of Mongolia. Multi‐temporal SPOT‐4 VEGETATION data from 1998 to 2001 have been used for the analysis. The correlations between the vegetation indices observed at various degrees of vegetation coverage during different stages of growth were examined. The results showed that in Mongolian desert steppe and Gobi desert zone MSAVI2 is the best, while in mountain steppe zone EVI is found to estimate biomass well. Generally, it was found that total biomass was decreased by 50.7% and 31.4% of rangeland is very severe degraded in the case study area.
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Javzandulam et al. (2005) studied this question.
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