《Table 1 The basic statistics of the soil organic matter and its auxiliary variables》

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《Combining Environmental Factors and Lab VNIR Spectral Data to Predict SOM by Geospatial Techniques》

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Notes:SOM:soil organic matter，ILUT:the index of land use type，LSWI:land surface water index，EVI:enhanced vegetation index，NDC:the nearest distance to construction land，RDLS:roughness and relief amplitude，CV:coefficient of variance

The distribution of SOM along with some of the predictors was described using classical descriptive statistics（Table 1）.SOM values ranged from 17.34 to 50.50 g/kg，and the mean value was 30.12 g/kg and the median value was 28.96 g/kg.The standard variance was 6.69g/kg and the coefficient of variation（CV）was 22.21%，suggesting that SOM had a moderate spatial variation based on Wilding（1985）.Six variables were selected as the predictors to construct the SOM prediction models.Table 1 shows the basic statistics of the other predictors.The mean values of elevation，ILUT，LSWI，EVI，RDLS and NDC were 27.47 m，3.06，0.08，0.12，9.28 and2390.67 m，respectively.The CVs of these auxiliary variables indicated that all of these predictors had a different degree of spatial variation across the study region.NDC had the greatest variation（75.71%）and ILUT had the least variation（13.35%）.More detailed basic statistics of SOM and its environmental factors can be found in Table 1.