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采用时域反射仪对长白山原始阔叶红松林3块50m×50m样地表层土壤(0～7.5cm)水分进行测定,应用地统计学的理论与方法对表层土壤水分的空间异质性进行分析.结果表明:研究区3块样地表层土壤水分变异系数分别为24.32%(样地1)、24.11%(样地2)和23.60%(样地3),均属于中等变异性;该区表层土壤水分的理论变异模型为球状模型,具有高度的空间异质性,其空间异质性以空间自相关部分为主;表层土壤水分的结构比分别为57.9%(样地1,属中等相关性)、83.3%和90.0%(样地2和3,属强烈的空间相关性);研究区表层土壤水分的变程在5.5～13.1m,与贝叶斯方法估计的变程相差不大;通过克立格插值估计,研究区表层土壤水分含量的平均值分别为49.3%(样地1)、52.8%(样地2)和42.6%(样地3).
The water content of three 50m × 50m samples of surface soil (0 ~ 7.5cm) in the evergreen broad - leaved Korean pine forest in Changbai Mountain was measured by using time domain reflectometer. The spatial heterogeneity of surface soil moisture was analyzed by geostatistical theory and method The results showed that the coefficients of variation of soil moisture of the three plots were 24.32% (plots 1), 24.11% (plots 2) and 23.60% (plots 3) The theoretical variation model of soil moisture is a spherical model with high spatial heterogeneity, and its spatial heterogeneity is dominated by spatial autocorrelation. The structural ratios of surface soil moisture are 57.9% (plot 1, moderate correlation ), 83.3% and 90.0% (samples 2 and 3, respectively). In the study area, the surface soil moisture ranged from 5.5 to 13.1 m, which was similar to the Bayesian method. Kriging interpolation estimated that the average values of surface soil moisture were 49.3% (plot 1), 52.8% (plot 2) and 42.6% (plot 3), respectively.