典型红壤侵蚀区土壤养分空间差异——以长汀县朱溪河小流域为例

Spatial Variability of Soil Nutrients in Typical Red Soil Erosion Region

自然环境的变化和人为作用的干扰都不同程度地影响着土壤养分的空间变异。以南方典型的红壤侵蚀区朱溪河流域为代表,利用ArcGIS与地统计学方法,研究了该流域土壤表层7种养分的空间变异及分布特征。结果表明:流域内土壤表层有机质、全氮、速效氮、全磷、速效磷、全钾和速效钾的空间相关性程度不同,其中全钾、速效钾和有机质的空间相关性较弱,全氮和速效氮的空间相关性中等,速效磷的空间相关性较强;土壤养分的含量表现为不同的分布格局。

The diversification of natural environment and human interference both affected the spatial variability of soil nutrients in varying degrees.The tools of ArcGIS and geo-statistics methods were used to study the spatial variability of soil nutrients of watershed of Zhuxi River in typical red soil erosion region in south China.The results indicated that：those soil properties had different spatial correlations respectively;the range of spatial correlations of available P was the highest and that of total K,available K and organic matter were the lowest,and the spatial correlation of total N and available N belonged to moderate class.According to the analytical results,supported by GIS,Kriging was applied to describe and analyze the spatial distribution of soil nutrients.The levels of seven soil nutrients showed different spatial patterns in space.