阔叶红松林林隙土壤物理性质微环境异质性分析

 以小兴安岭阔叶红松林林隙为研究对象,采用地统计学方法对林隙0～20 cm和20～40cm土层土壤物理性质的微环境异质性进行分析。结果表明:阔叶红松林林隙表层土壤含水量、饱和持水量、毛管持水量和孔隙度均大于下层,但土壤密度相反;表层土壤物理性质有相对高的极差和变异系数。土壤物理性质总空间异质性程度和由空间自相关引起的异质性均为表层土壤高于下层。土壤含水量表现出明显各向异性,土壤孔隙度趋近于各向同性,其他3个物理因子随空间距离增大而表现出各向异性。表层土壤物理性质在空间自相关范围内变异函数相互影响较小。不同层次土壤物理性质空间分布均以中低等级斑块为主,相对较高等级的斑块仅分布在020cm土层中,并位于林隙中心以北的范围内。

The microenvironmental heterogeneity of soil physical properties in a broad-leaved Pinus korariensis forest gap

Based on broad-leaved Pinus koraiensis forest gap in Xiao Xing'an Mountains,microenvironmental heterogeneity of soil physical properties in 0-20 cm and 20-40 cm soil layers in the gap were analyzed by geographical statistics' method.The results showed: Soil moisture,saturation moisture capacity,capillary moisture capacity and porosity in top layer were more than that in lower layer,but bulk density was opposite;soil physical properties in top soil layer had greater ranges and coefficients of variation.The total and autocorrelation spatial heterogeneity of soil physical properties in top layer were greater than that in lower layer.The soil moisture had a stronger anisotropic structure n E 0° and N 90° direction,but the porosity showed isotropic in the same direction;with spatial distance increasing,another 3 physical factors showed anisotropic structures.The effect of autocorrelation spatial heterogeneity of soil physical properties in top layer was not significant.The more patches at middling and lower ranks distributed in forest gap,but little patch at higher rank distributed in 0-20 cm soil layer,and it was located in the north of forest gap.