Spatial Estimation of Soil Organic Matter in Karst Peak-cluster Depression
RETRACTED ARTICLE

Spatial Estimation of Soil Organic Matter in Karst Peak-cluster Depression

Li Hui, * Open Modal , 1 Jiang Zhong-Cheng2 Yang Qi-Yong3 Yin Hui1 , 2 Wang Yue3
Authors Info & Affiliations
The Open Civil Engineering Journal • 29 Oct 2015 • RETRACTED ARTICLE • DOI: 10.2174/1874149501509011022

Abstract

In order to enhance the accuracy of spatial estimation of soil organic matter (SOM), spatial predictions of SOM in 0~20 cm depth were conducted in Guohua Ecological Experimental Area of Minister of Land and Resource of the People’s Republic of China. Analysis of multiple linear stepwise regressions showed that the two terrain attributes of relief 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 of spatial estimation of SOM was compared among methods of ordinary kriging (OK), multivariable cokriging (MCOK) and regression kriging (RK). Results showed that RK and MCOK methods with terrain attributes as auxiliary variables could enhance 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.

Keywords: Auxiliary variable, cokriging, regression kriging, soil organic matter, terrain attribute.