- 责任者：Lei Li (Center for Research of Territorial Resource Environment and Tourism ; Foshan Scientific and Technologic College ; Foshan 528000 ; China) ; Wei Xinghu
- 刊名：Geographical Research
- 出版年：2013
- 卷期：32(12)
- 关键词：岩溶 ; karst ; 土壤 ; soils ; 广东 ; Guangdong
- 页码：p.2204-2214
- 图表：7 illus., 1 table, 18 refs.
- 分类号：1400
- issnNo：ISSN1000-0585
- isbnNo：CN11-1848/P
In this paper, we selected two typical profiles in karst mountainous area of Liannan county, Guangdong province, the underground distribution feature of funnels and crack were investigated and grain-size parameters were measured. The results show that, main underground transport channels of soil are funnels, cracks and caves, which are formed by differential weathering of carbonate rock, abundant rainfall infiltration, gravity and corrosion. Funnels, cracks and caves distribution depends primarily on the rock composition and the joint structure, and surface range of 0-10 m is the main distribution area. The funnel soil area accounted for 23.1%-28.1% of the total cross-sectional area, while the crack soil area occupied 5.3%-8.9% of the total area, and the hole soil area is only 0.16%. The total soil area in the profiles accounted for 28.4%-37.16% of the total area of profiles. Soil grain-sizes underground are mainly coarse silt and sand, followed by clay and fine silt. The vertical grain-size distribution of soil in the funnel and crack proves that there are two processes of soil migration： the horizontal erosion and vertical leakage. There are three soil migration stages： surface erosion, infiltration of fine-grained soil material, and accumulation of fine-grained soil material in the karst mountains. The main driving force of the soil migration leakage is soil gravity and the infiltration of water gravity.