衰退对云冷杉林表层土壤水分异质性的影响  

Effects of degradation on spatial heterogeneity of topsoil moisture in spruce-fir forests

作　　者：陈立明[1] 姜生伟[2] 满秀玲[1] 

机构地区：[1]东北林业大学林学院,黑龙江哈尔滨150040 [2]辽宁省林业厅,辽宁沈阳110001

出　　处：《辽宁林业科技》2010年第2期1-5,29,共6页Liaoning Forestry Science and Technology

基　　金：国家自然科学基金项目(30771713)

摘　　要：利用传统统计学与地统计学相结合的方法对小兴安岭谷地不同衰退程度云冷杉林表层土壤(0～20cm)水分空间异质性和格局进行研究。结果表明,衰退明显增加了林地表层平均水分的含量,不同衰退程度的云冷杉林地之间表层土壤水分含量均有极显著差异(p<0.01)。半方差函数分析结果表明,随着衰退程度的增加,使得平均块金值、基台值增大,空间结构比随着衰退程度的增加而减小。云冷杉林表层土壤水分含量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,从占总空间异质性的99%减小到71%;各向异性分析也表明,不同衰退程度的云冷杉林地表层土壤水分在各方向上为各向同性,表明土壤水分变化是独立、随机、同质性的;其空间格局有明显的差异,随着衰退程度的增加,分数维变大,斑块形状复杂程度增大,表层土壤水分空间分布格局明显破碎化。The spatial heterogeneity and patterns for topsoil （0 - 20em） moisture of degraded spruce-fir forests on low-lying lands in Lesser Xing＇ an Mountains were studied with the methods of combination of traditional statistics with Geosttisics, The results showed that： degradation increased obviously topsoil moisture, there existed difference significantly （p〈0.01） for topsoil moisture on different degraded spruce-fir forest. Semi-variance function analysis indicated that the means of nugget and sill were increased and spatial sturchure was decreased with the increment of degradation, There was a high spatial heterogeneity in soil moisture in spruce-fir forests, and the spatial heterogeneity decreased form 99~./0 to 71% was mainly caused by spatial autocorrelation. Anisotmpic analysis also revealed that it was isotmpic for topsoil moisture in each direction in different degraded spruce-fir forests, which showed that the variation of topsoil moisture was independent, random and homogeneous, the spatial patterns differed significantly. With the incre- ment of degradation, fractions became big and complicity of shape of patches was increased, and the spatial distribution patterns for topsoil moisture were more fragmentation.

关 键 词：土壤水分 衰退 云冷杉林 空间异质性 变异函数 

分 类 号：S152.7[农业科学—土壤学] S714.7[农业科学—农业基础科学]