南方花岗岩红壤典型区土壤有机质的空间变异特征

 通过野外实地调查与室内试验,以长汀县为研究区,在GIS的支持下,运用地统计学方法分析南方花岗岩红壤典型区表层土壤有机质的空间变异特征。结果表明:研究区土壤有机质质量分数总体水平中等并具有中等的空间相关性,平均为2.73%;变异系数为72.73%,属中等变异;由空间自相关部分引起的空间变异性程度较大,C0/(C0+C)值为47.13%,变程为21.48km;在空间分布上呈现四周高中间低的分布特征,在中部地区形成连片的低值区,西部有机质质量分数整体较高,存在最高值。研究成果可为南方花岗岩红壤侵蚀退化地的生态恢复与重建提供参考。

Spatial variability of soil organic matter content in a typical granite red soil region of Southern China

Geostatistics has proven to be useful for characterizing and mapping spatial variability of soil properties.In this paper,a geostatistics method,combined with Geographic Information System(GIS),was applied to analyze the spatial variability of soil organic matter(SOM) in topsoil in the typical granite red soil region of Southern China.The results showed that the mean of SOM was 2.73%,and the variance coefficients of that was 72.73%,which belongs to medium spatial variability.The theoretical semi-variogram model of SOM was spherical model.The C₀/(C₀+C) of SOM was 47.13%.It was also indicated that the SOM had obvious spatial self-relativity in this area,and the effective range was 21.48 km.The Kriging spatial interpolation showed that SOM decreased gradually from outside to central in the study area.There was the lowest value of SOM existing in the central area,and the highest value of SOM existing in the western area.The research findings can provide reference to ecological restoration and reconstruction in soil and water conservation region of the typical granite red soil region of Southern China.