贵州石漠化地区棕黄色粘性土团聚体稳定性研究  

WET SIEVING FOR STABILITY OF BROWN CLAYEY CLAY IN KARST ROCKY DESERTIF ICATION AREA IN PUDING COUNTY,GUIZHOU PROVINCE

作　　者：唐益群[1,2] 张晓晖[2] 佘恬钰[2] 杨坪[1,2] 王建秀[1,2] 

机构地区：[1]同济大学岩土及地下工程教育部重点实验室,上海200092 [2]同济大学地下建筑与工程系,上海200092

出　　处：《工程地质学报》2009年第6期817-822,共6页Journal of Engineering Geology

基　　金：国家重点基础研究发展计划(973计划)西南喀斯特山地石漠化与适应性生态系统调控子课题"西南喀斯特山地土壤侵蚀过程与水土流失危险度评价"(No.2006CB403203)项目资助;上海市重点学科(地质工程)建设项目资助(项目编号:B308)

摘　　要：以贵州省普定县碳酸盐岩石漠化研究试验区(陈旗村)的棕黄色粘性土为研究对象,考虑了初始含水率和浸润时间两个影响因素,对研究区土体中占绝对优势的>5mm的大颗粒团聚体进行了共计16组湿筛法试验。结果表明:棕黄色粘性土团聚体遇水破裂的过程主要发生在被浸润初期,初始含水率越小的土壤,经雨水浸润后,大颗粒团聚体破裂得越快越彻底;而原本就比较湿润的土体,团聚体的稳定性则较好。因此,对碳酸盐岩石地区石漠化的防治,应着重考虑气候长期干燥、蒸发量对水土流失的影响。The carbonate rock area in the Chenqi village of Puding County, Guizhou Province is an area of karst rocky desertification. This paper examines the stability of brown clayey soil in the karst rocky desertification. The paper uses the wet sieving method. The results show that cracking of the brown clayey soil aggregates due to encountering water occurs in the early soaked stage. The less the initial water content of the brown clayey soil aggregates is, after soaked with rainwater, the quicker the cracking of soil aggregates is. Stability of the brown clayed soil aggregates is good for the soil with high water content. So, for prevention of rocky desertification of the carbonate rock area, it is important to take into consideration of the effect of desiccation climate and evaporation quantity on the soil loss.

关 键 词：石漠化 棕黄色粘性土 团聚体 土壤漏失 

分 类 号：S152.4[农业科学—土壤学]