摘要
该文以土壤颗粒组成分维和孔隙分布分维来表征土壤结构,研究土壤结构分形特征对重庆缙云山不同土地利用下土壤抗剪性能的影响,以期为三峡库区水土保持型植被建设提供一定的依据。研究结果表明:机械组成分维和微团聚体组成分维对内摩擦角影响最大,比其它影响因子大一个数量级;影响黏聚力值的因素众多,影响最大的是机械组成分维。在同一土壤含水率下,混交林地易受剪切破坏面在A2层和B层,阔叶林地最易受剪切破坏面在A2层,楠竹林最易受剪切破坏面在C层,灌木林地最易受剪切破坏面在A2层,农地最易受剪切破坏面在B层。
The soil structure was described with fractal dimensions of particle size distribution （PSD）, aggregate size distribution（ASD） and soil pores distribution（SPD）. The effects of fractal feature on shear-resistant intensity of soil under different land uses were investigated to offer some bases for soil and water vegetation construction in Three Gorges Reservoir Areas. The results indicate that the fractal dimensions of PSD and ASD have more important effects on internal friction angle according to the regression coefficient, which have one magnitude order larger than other factors, and cohesion is influenced by more factors, and the fractal dimension of PSD has more important effects on cohesion. In the same soil water content, the easiest shear face lied in A2 and B layer in mix wood, in A2 layer in broadleaf forest, in C layer in bamboo forest, in A2 layer in shrub forest and in B layer in arable land.
出处
《农业工程学报》
EI
CAS
CSCD
北大核心
2006年第3期40-45,共6页
Transactions of the Chinese Society of Agricultural Engineering
基金
国家十五攻关课题子课题"长江三峡水源涵养林植被建设技术研究与示范"(2004BA510B02-01)
国家林业局长江三峡库区(重庆)森林生态站(98J-01-11)
关键词
土壤结构
分形特征
内摩擦角
黏聚力
抗剪强度
soil structure
fractal feature
internal friction angle
cohesion
shear-resistant intensity
