关帝山华北落叶松林下土壤水分空间异质特征

选择山西省庞泉沟国家自然保护区,利用地统计学的方法对关帝山次生林下不同层次土壤水分的空间异质性进行研究。结果表明:在研究区内,表层土壤水分的含量随着土壤深度的增加而急剧减少,当达到一定深度(>20cm)时,土壤含水量不仅不减少,反而出现增长的趋势。从变异函数看:随着研究尺度的增大,土壤水分含量的空间自相关性增强;随着土壤深度的增加,均定系数增大但分数维减小,土壤含水量的随机性分布减小,由随机性因素引起的空间变异占总空间异质性的比重降低。从空间格局看:a(0～10cm)层土壤含水量主要呈块状分布,且形状较为复杂,b(10～20cm)和c(20～30cm)层呈带状分布,且形状较为一致。

Spatial Heterogeneity of Soil Moisture under Larix principis-rupprechtii on Guandishan Mountain,Shanxi,China

This paper choose the country level nature protection area Shanxi Province Pangquangou Nature Reserve as the study state,and use semivariance analysis of geostatistics to test for differences in the spatial Heterogeneity of different level soil moisture under Guandishan secondary forest.The result showed that:In the research area,there is a tendency towards decreasing of the top soil moisture with the soil depth.when achieves the certain depth(>20cm),the soil moisture content not only does not reduce,instead appears the increasing tendency.Semivariogram analysis demonstrated that with the increasing of research criterion,the spatial autocorrelation of soil moisture content improve;and with increasing of the soil depth,the R2 improv but the spatial patchiness reduce,the random distribution of soil moisture content reduce,the proportion of spatial variation which causes by the random factor in the all spatial Heterogeneity reduce.Looked from the spatial pattern that,A(0~10cm) level soil moisture content mainly assumes the massive distribution,and the shape is more complex,b(10~20cm) and c(20~30cm) level assumes the belt-shaped distribution,and the shape is consistent.