赤山斜坡土体大孔隙特征研究  

Macropores Features of Soil in Chi Mountain Slope

作　　者：曾强[1] 王乐[1] 

机构地区：[1]昆明理工大学,云南昆明650500

出　　处：《安徽农业科学》2015年第34期189-190,240,共3页Journal of Anhui Agricultural Sciences

摘　　要：[目的]明确赤山斜坡土体大孔隙特征,为滑坡灾害防御提供参考。[方法]采集湖洲岛赤山斜坡土体,基于水分穿透法研究土体大孔隙特征。[结果]大孔隙尺寸范围为1.99~0.80 mm,居于中间尺度范围的大孔隙数量较多,大孔隙特征表现为土体表层和底层的两极分化。深度变化范围内,土体大孔隙特征会有局部突变,但总体上大孔隙数量、大孔隙尺寸、大孔隙度均随深度增加而减小。根系和有机质均是影响大孔隙特征的重要因素,但对大孔隙尺寸的影响程度更高。与有机质相比,根系与土体大孔隙特征相关性更大。[结论]局部变异并不影响大孔隙特征的整体发展规律;根系和有机质对斜坡土体大孔隙特征具有不同程度的影响。[Objective] The aim was to clear macropores features of soil in Chi Mountain slope to provide reference for controlling landslide disaster. [Method] We collected the soil of slope in Chishan island lake,and studied soil macropores features based on water penetration method. [Result] Macropore size was in the range of 1. 99-0. 80 mm; the number of macropores in the middle range was larger; macropores was characterized by the soil surface and bottom of polarization. Changing in the range of depth,macropores characteristics of soil had partial mutations,but the overall number of macropores,macropores size,macropores porosity were decreased with the increase of depth. Roots and organic matter were important factors that affect the characteristics of macropores,and had higher degree of influence on the macropores size.Compared with organic matter,roots had more relevant with soil macropores characteristics. [Conclusion]Partial mutations don＇t affect the overall development law of macropores characteristics; Roots and organic matter have different degrees of influence on macropores features of soil in Chi Mountain slope.

关 键 词：滑坡 水分穿透 Poiseuille方程 大孔隙 

分 类 号：S429[农业科学—植物保护]