运用地统计学对莲花湖库区红松水源涵养林表层土壤水分-物理性质进行了空间异质性分析。研究结果表明: 土壤含水量、土壤密度、毛管孔隙度、非毛管孔隙度等因子均服从对数正态分布;毛管孔隙度最优拟合模型是球状模型,其它因子均为指数模型。土壤含水量、土壤密度、毛管孔隙度和非毛管孔隙度块金值、变程、结构比、分数维和空间自相关系数最大值分别为0.311、0.297、0.192、0.293,6.87 m、10.29 m、8.31 m、8.88 m, 0.690、0.694、0.814、0.707,1.968、1.939、1.937、1.945,0.111、0.200、0.246、0.157。可见以上4个因子空间自相关性均较强,随着空间距离的增大,其相关性逐渐减弱。其中毛管孔隙度均一性程度较高;土壤含水量空间分布形态较复杂,破碎化程度高。
Spatial distribution characteristics of soil moisture-physical properties in water conservation forest of Pinus koraiensis in Lianhua Lake reservoir area were analyzed by geostatistics. The results showed soil moisture content, soil bulk density, capillary porosity and non-capillary porosity all exhibited lognormal distribution. The optimum fitting model for capillary porosity was spherical model; that for the other factors was exponential model. For soil moisture content, soil bulk density, capillary porosity and non-capillary porosity, their nuggets, effective ranges, proportions, fractal dimensions and maximum Moran’s I were 0.311, 0.297, 0.192, 0.293; 6.87 m, 10.29 m, 8.31 m, 8.88 m; 0.690, 0.694, 0.814, 0.707;1.968, 1.939, 1.937, 1.945; 0.111, 0.200, 0.246, 0.157, respectively. Therefore, the spatial autocorrelation of soil moisture-physical properties was strong, and the correlation decreased with the increase of separation distance. Capillary porosity had conspicuous homogeneous character, and soil moisture content had complicated spatial distribution and high degree of fragmentation.
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