森林土壤物理性质的空间异质性研究

The spatial heterogeneity of soil physical properties in forests

土壤空间异质性是土壤的重要属性之一。采用地统计学的理论和方法 ,研究了阔叶红松林上层土壤物理因子的空间异质性。变异函数分析结果表明 ,土壤水分、容重、毛管持水量和孔隙度具有明显的空间异质性。在 0～ 1 0 cm土层深 ,空间异质性尺度为 1 1～ 1 3m,1 1～ 2 0 cm土层深为 6～ 8m,空间异质性程度随尺度变化。自相关部分的空间异质性在 0～1 0 cm和 1 1～ 2 0 cm土层深为 52 .9%～ 73.7%和 69.3%～ 93.6% ,明显大与随机部分的空间异质性。各向异性分析表明 ,在空间上水分和孔隙度具有明显的各向异性 ,而容重和毛管持水量接近各向同性。另外 ,在空间自相关范围内 ,土壤各物理因子的空间异质性有重要的密切关系。

Spatial heterogeneity is one of important properties in soil We use the principle and methods of geostatistics to study spatial heterogeneity of soil physical properties under old growth korean pine forests The results of semivariogram analysis show that there are high degrees of spatial heterogeneity in soil moisture,bulk density,capillary moisture capacity and porosity In 0～10 cm laryer,the scale of spatial heterogeneity is 11～13 m,and that is 6～8 m in 11～20 cm layer The degrees of spatial heterogeneity changes with this scales The nugget variance to sill ratio shows that spatial heterogeneity of autocorrelation in total spatial heterogeneity are 52 9%～73 7%(0～10 cm layer)and 69 3%～93 6%(11～20 cm layer)respectively,Both soil moisture and porosity have a stronger anisotropic structure in E 0° and N 90°directions,bulk density and capillary moisture capacity in the same directions are close to isotropy The semivariograms of these physical factors have a close relationships and effect on each others