晋西黄土区林草复合界面雨后土壤水分空间变异规律研究  

Research on spatial heterogeneity of soil moisture after raining at forest-grassland boundary in the Loess region of west Shanxi

作　　者：云雷[1] 毕华兴[1] 田晓玲[1] 马雯静[1] 崔哲伟[1] 

机构地区：[1]北京林业大学水土保持学院//水土保持与荒漠化防治教育部重点实验室//山西吉县森林生态系统国家野外科学观测研究站,北京100083

出　　处：《生态环境学报》2010年第4期938-944,共7页Ecology and Environmental Sciences

基　　金：国家"十一五"科技支撑项目(2006BAD03A0503)

摘　　要：利用统计学方法对晋西黄土区林草复合系统界面上雨后表层(0～10 cm)、亚表层(10～20 cm)和20～40 cm土层土壤水分空间变异性进行研究。结果表明:草地、林地以及二者组成的林草界面的土壤水分含量、变异系数差别均不大,土壤水分含量随着深度的增加而减少,但土壤水分变异系数则相反;移动窗口法分析表明,林草界面对表层和亚表层的土壤水分影响范围均为4.0 m;草地土壤质量含水量的变异函数模型可以拟合成高斯模型,林地和林草界面则可以拟合球状模型,草地土壤水分总体空间异质性要大于林地和林草界面,草地土壤水分变异函数的平均变程为10.96 m,林草界面及林地土壤水分的平均变程分别为5.37 m和4.31 m。对于描述界面土壤水分分布情况,克立格制图直观性强,具有良好效果。The spatial variability of different layers（0-10 cm,10-20 cm and 20-40 cm） soil moisture after raining at the forest-grassland boundary in the Loess Region of West Shanxi were studied by using statistical method.The results showed that the differences of soil moisture content and variation coefficient among the different landscape types,but the differences were not significant.Soil moisture content was decreased with the increased depth of soil in vertical direction,but variation coefficient of soil moisture was just the opposite;By using moving split-window techniques,it was obtained that the width of edge influence in surface（0-10 cm） and subsurface（10-20 m） layer was 4.0 m,respectively.The model of soil moisture variation in different layers were gaussian model in grassland,spherical model in forestland and forest-grassland boundary.The total spatial heterogeneity of soil moisture was higher in grassland compared with forestland and forest-grassland boundary.The average ranges of soil moisture variation in grassland,forestland and forest-grassland boundary were 10.96 m,5.37 m and 4.31 m,respectively.Kriging map gives a very strong visual impression,it obtains good results in expressing the spatial structural characters.

关 键 词：晋西黄土区 林草复合界面 土壤水分 空间分布特征 空间异质性 

分 类 号：S152.7[农业科学—土壤学]