南方典型毛竹经营区土壤养分空间变异特征——以福建省南平市顺昌县毛竹林经营区为例

Spatial Variability of Soil Nutrients in Typical Phyllostachys pubescens Growing Areas in South China——Takmg Phyllostachys heterocycla cv. Pubescens forest management area in Shunchang County,Nanping City,Fujian Province as Example

以福建南平市顺昌县的典型毛竹(Phyllostachys heterocycla cv.Pubescens)林经营区为研究对象,采用地统计学与GIS分析方法,分析了毛竹林林地的土壤化学指标的空间变异规律与分布格局。结果表明:土壤有机质、全氮、p H值、水解氮、速效钾的块基比均小于25%,表明其具有强烈的空间相关关系;有效磷质量分数的块基比为30.42%,其空间分布为中等相关关系;土壤化学指标变异程度由强到弱依次为:有机质(54.35%)、水解氮(53.56%)、速效钾(42.48%)、全氮(42.28%)、有效磷(36.61%)、p H值(6.49%);有效磷、水解氮和p H的最佳半方差函数模型为球状模型,速效钾和全氮的最佳半方差函数模型为指数模型,有机质为高斯模型;水解氮、有机质、p H值和全氮质量分数东部与中部较高,有效磷质量分数西部与中部较高,速效钾质量分数东部高于西部,中部较四周高。

With Phyllostachys heterocycla cv.Pubescens forest management area in Shunchang County,Nanping City,Fujian Province,by geostatistics and GIS analysis methods,we studied the spatial variability and distribution pattern of soil chemical indexes in P.pubescens forest.The block ratios of soil organic matter,total nitrogen,pH value,hydrolyzable nitrogen and available potassium were all less than 25%,indicating a strong spatial correlation;the block ratio of the available phosphorus content was 30.42%,and its spatial distribution was moderate correlation.The degree of variation of soil chemical index was from strong to weak:soil organic matter(54.35%),hydrolyzed nitrogen(53.56%),available potassium(42.48%),total nitrogen(42.28%),available phosphorus(36.61%),and pH(6.49%).The best semivariance function models of available phosphorus,hydrolyzed nitrogen and pH were spherical model,the best semivariogram model of available potassium and total nitrogen was exponential model,and the organic matter was Gaussian model.Nitrogen,organic matter,pH and total nitrogen content were highly distributed in the eastern and middle areas,and the available phosphorus content was highly distributed in the west and middle part,and the middle part of the available potassium content which as more highly distributed in the east than in the west was highly distributed around.