不同干密度对岩溶区红壤抗蚀性的影响  

Effects on anti-erodibility of red soil aggregates with different dry density in karst area

作　　者：龚傲龙[1] 陈春武[1] 普千益 潘昆[1] 包磊[1] GONG Aolong CHEN Chunwu PU Qianyi PAN Kunl BAO Lei(Ktmming Survey ＆ Design Institute of State Forestry Administration, Kunming 650216 Kunming Hezhu Engineering Technology Consulting Co.,Ltd, Kunming 650032)

机构地区：[1]国家林业局昆明勘察设计院,云南昆明650216 [2]昆明和筑工程技术咨询有限公司,云南昆明650032

出　　处：《林业建设》2016年第5期35-39,共5页Forestry Construction

摘　　要：通过采用简化湿筛法,分析在不同初始干密度和浸润时间条件下,岩溶区坡面红壤团聚体遇水浸润后稳定情况。结果表明:红壤结构体在浸水初期(前10min)完成大部分崩解过程;试样崩解后MWD值随浸润时间增加近似呈负线性关系;红壤结构体抗蚀性随干密度增加存在"转折干密度"现象;试样崩解后MWD值随初始含水率增加近似呈指数增长。建议对岩溶区坡面红壤采取压实处理,提高表层红壤干密度,增加抗蚀性,减少坡面土壤侵蚀。The simplified wet sieving method was adopted to analyze the stability of red soil slope after rainwater infiltration in karst area under the condition of different initial dry density and infiltration time. The results show that the cracking of soil aggregates due to encountering water occurs in the early soaked stage. With the increasing of infiltration time, the MWD values linearly decrease with the infiltration time. There is a critical dry density when the stability of slope laterite aggregates in karst area with low initial water content change with the dry density. An index function is proposed to describe the relationship between the MWD values and dry density. Some advices are also proposed that, a compacting disposal could be adopted to increase the dry denstiy and the stability of soil aggregates, reduce the amount of slope soil erosion.

关 键 词：岩溶区 红壤 抗蚀性 初始干密度 

分 类 号：S157[农业科学—土壤学]