In order to enhance the accuracy of spatial estimation of soil organic matter (SOM), spatial predictions of SOMin 0~20 cm depth were conducted in Guohua Ecological Experimental Area of Minister of Land and Resource of thePeople’s Republic of China. Analysis of multiple linear stepwise regressions showed that the two terrain attributes ofrelief degree of land surface (RS) and distance from ridge of mountains (DFR) entered into the regression equation.Therefore, RS and DFR were selected as auxiliary variables to predict SOM by MCOK and RK methods. The accuracy ofspatial estimation of SOM was compared among methods of ordinary kriging (OK), multivariable cokriging (MCOK) andregression kriging (RK). Results showed that RK and MCOK methods with terrain attributes as auxiliary variables couldenhance the accuracy of spatial estimation of SOM, and MCOK method could promote the accuracy notable by 31.33%.This study can provide a new idea and method for evaluation of soil quality in karst areas.
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