重庆缙云山不同林地土壤剪切破坏特性及影响因素研究  

Characteristics of Soil Shear Failure of Different Forests and Its Affecting Fac-tors in Jinyun Mountain, Chongqing City

作　　者：李云鹏[1] 王云琦[1] 王玉杰[1] 张会兰[1] 朱锦奇[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,北京100083

出　　处：《土壤通报》2013年第5期1074-1080,共7页Chinese Journal of Soil Science

基　　金：中央高校基本科研业务费专项基金(TD2011-01)资助

摘　　要：缙云山地处三峡库区附近,坡面侵蚀以剪切破坏为主。选取缙云山5个标准样地,通过研究各个林地类型内土壤临界剪切力随深度的变化以及测量多个土壤物理性质指标,得出不同林地抵抗剪切破坏能力的强弱关系和这些指标对不同林地土壤抗剪能力的影响以及主次关系。结果表明,在每个林地中,原状土的临界剪切力随深度的增加而增加;通过库伦公式得出的土壤抗剪强度与土壤临界剪切力的回归方程为:y=4.372 x2+29.03(R2=0.813,n=25)。对于同一林地,在楠竹林中,土壤孔隙是影响临界剪切力的主要因素,在常绿阔叶林中却是土壤含水率,而对于其他三个林地,均为土壤结构指标与土壤临界剪切力的相关性最大;对于土壤临界剪切力和土壤抗剪强度,不同物理指标的组合影响是变化的。但总的来说,在不同林地中,相同土壤物理指标对抗剪能力的影响基本是一致的。This study was conducted in Jinyun Mountain, locating in the Three Gorges Reservoir Area, where the major erosion type on slope surface was shear failure. Therefore, standard sample plots were set in five typical forests to study the effects of forest on the characteristics of soil shear failure and its affecting factors. By measuring the soil critical shear force and soil physical properties with soil depth, we can find the shear resistance ability of different forests and its major affecting factors. Results showed that in forest lands, the soil critical shear force increased with the soil depth. The relationship between soil shear strength calculated by Kulun for-mula and soil critical shear force measured in field agreed with the equation y = 4.372x2 ＋ 29.03 （R2 = 0.813, n = 25）. To the affecting factors on soil critical shear force, in Phyllostachys pubescens forests, the major factor was soil porosity index, in evergreen broad-leaved forest was the soil moisture content, and in the other forests were all the soil structure index. The different soil physical indices could lead to different impacts on soil critical shear force and the shear strength, and the interaction of different soil physical induce may lead to absolutely opposite effects. But in general, in different forest lands, the same soil physical index will give the near same impact on shear strength capacity

关 键 词：土壤剪切力 土壤物理性质 抗剪强度 

分 类 号：S714[农业科学—林学]