莲花湖库区红松水源涵养林土壤水分-物理性质的空间分布特征

Spatial Distribution Characteristics of Soil Moisture-physical Properties in Water Conservation Forest in Lianhua Lake Reservoir Area

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.