闽西竹林土壤物理性质的空间变异格局  

Spatial Heterogeneity of Soil Physical Properties of Phyllostachys heterocycla cv. Pubescens Forest,Western Fujian

作　　者：陈樟昊 余坤勇[1] 刘健[1] 林同舟 何平[1] 

机构地区：[1]福建农林大学,福州350002

出　　处：《东北林业大学学报》2017年第8期49-56,共8页Journal of Northeast Forestry University

基　　金：福建省科技引导性项目(2016N0003);林业科技成果国家级推广项目(KH1130006)

摘　　要：采用地统计学与GIS分析方法,分析闽西永安市6个乡镇的毛竹林地的土壤含水量、土壤密度、最大持水量、最小持水量和土壤总孔隙度等6个物理性质的空间变异规律与分布格局。6个土壤物理指标变异系数介于0.12~0.30,均属中等变异;土壤含水量、最大持水量和毛管持水量最佳半方差函数模型均为球状模型,变程依次为3 970、4 360、4 710 m,土壤密度、最小持水量和毛管总孔隙度最佳半方差函数模型均为指数模型,变程分别为5 490、5 310、6 690 m,均大于1 000 m采样距离,且各指标随机性变异占总变异比例低于25%,分形维数趋近2,均呈现强空间相关性;除土壤密度呈各向同性且以0°方向(西—东)为优势格局外,其余5个指标呈各向异性且均以45°方向(西南—东北)为优势格局。土壤含水量与土壤密度的分布呈相反趋势,最大持水量、最小持水量和毛管总孔隙度分布格局相似,毛管持水量分布与研究区海拔密切相关,6个物理性质空间变异呈显著相关。The Classical Theory of Statistics, Geostatistics and Geographic Information Systems were performed to analyze spatial variability and distribution pattern of the six soil physical properties of Phyllostachys heterocycla cv. Pubescens forest including soil moisture, soil density, maximum moisture holding, minimum moisture holding, capillary water capacity and soil porosity in six towns of Yongan City. The coefficient of variation of six soil physical properties were between 0.12 and 0.30, which exhibited moderate variation. The best semivariance model of soil moisture, maximum moisture holding and capillary water capacity were spherical model, while the best semivariance model of soil density, minimum moisture holding and soil porosity were exponential model. Effective variation range of six soil physical properties were from 5 970 to 6 690 m, all of which were greater than sampling scale of 1 000 m. Also, random variation of six soil physical properties in total variation were less than 25%, and fractal dimension of every research index approaches 2, which suggested that intensive spatial autocorrelation. In addition to reflecting isotropic regularity in soil density and dominant pattern of 0° direction （ from west to east）, the rest of five soil physical properties reflected anisotropic regularity and dominant pattern of 45° （from southwest to northeast）. There was opposite trend of distribution between soil moisture and soil density, meanwhile, there was similar pattern of distribution among maximum moisture holding, minimum moisture holding and soil porosity. The capillary water capacity was closely tied with elevation in the study area. Among the six soil physical properties there were significant correlation.

关 键 词：毛竹 土壤物理性质 空间异质性 

分 类 号：S153.6[农业科学—土壤学]