《Table 1 Comparison of accuracy from two estimation models1)》

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《Remotely sensed estimation and mapping of soil moisture by eliminating the effect of vegetation cover》

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1) AE，RE，RMSE，MAPE and TIC refer to absolute error，relative error，root mean square error，mean absolute percent error and theil inequality coefficient，respectively.

Using the soil type map，the statistical characteristics of SM were obtained for different soil types through spatial statistical analysis（Table 2）.Histosols soil is located in the low-lying belts of river sources，mountains，valleys and lake plains.Naturally，its SM is the highest，with an average value of 21.7%，minimum value of 12.9%，and maximum value of 75.8%.Inceptisols is mainly distributed in the relatively flat plateau-planation surface which is beneficial to collect and preserve SM.Therefore，its SM is relatively high，with an average of 20.9%.Aridisols is located in the edge of small basin depressions.This terrain is also useful for stopping water from flowing away，but there is strong evaporation，causing soil salinity to gradually accumulate to land surface，leading to decreasing SM.So，taken together，the SM of Aridisols is relatively high.SM estimation results，at an average value of 21.1%，were reasonable.Mollisols is developed in semi-humid cold climatic region，and is mainly distributed in the lake terraces，with vegetation of alpine grassland.Therefore，its SM is relatively small，with an average value of 20.5%and a minimum value of 1.2%.Entisols is mainly distributed in mountain ridges，moraine terrace，and flowstone beach，and is filled with a large amount of gravel resulting in strong water permeability.Therefore，its SM is the minimum，with the average value of 19.4%.Overall，SM estimation results were consistent with the characteristics of soil types and terrain in Qinghai Lake Basin.