Spatial distribution of surface rock fragment on hillslopes in a small catchment in wind-water erosion crisscross region of the Loess Plateau  

作　　者：ZHU YuanJun1,2 & SHAO MingAn1 1 Institute of Soil and Water Conservation, Chinese Academy of Sciences and Ministry of Water Resources, Northwest Agriculture and Forestry University, Yangling 712100, China 2 Institute of Geographical Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China 

出　　处：《Science China Earth Sciences》2008年第6期862-870,共9页中国科学（地球科学英文版）

基　　金：the Program for Innovative Research Team in University (Grant No. IRT0749);the National Natural Science Foundation of China (Grant No. 50479063)

摘　　要：The cover and size distributions of surface rock fragment in hillslopes were investigated by using digital photographing and treating technique in a small catchment in wind-water erosion crisscross region of the Loess Plateau. The results indicated that the maximal cover of rock fragment was pre-sented at mid-position in steep hillslope. Rock fragment presented a general decreasing-trend along the hillslope in gentle hillslope. Rock fragment cover was positively related to gradient, rock fragment size decreased generally along the hillslope, and the size reduced with the gradient. The mean size of rock fragment was at a range of 6―20 mm in the steep hillslope, rock fragment size > 50 mm was rarely presented. The covers of rock fragment at different positions were markedly related to the quantities of rock fragment < 40 mm. The area of rock fragment of 2―50 mm accounted for 60% or more of the total area, dominating the distribution of rock fragment in the hillslopes.The cover and size distributions of surface rock fragment in hillslopes were investigated by using digital photographing and treating technique in a small catchment in wind-water erosion crisscross region of the Loess Plateau. The results indicated that the maximal cover of rock fragment was presented at mid-position in steep hillslope. Rock fragment presented a general decreasing-trend along the hillslope in gentle hillslope. Rock fragment cover was positively related to gradient, rock fragment size decreased generally along the hillslope, and the size reduced with the gradient. The mean size of rock fragment was at a range of 6–20 mm in the steep hillslope, rock fragment size > 50 mm was rarely presented. The covers of rock fragment at different positions were markedly related to the quantities of rock fragment < 40 mm. The area of rock fragment of 2–50 mm accounted for 60% or more of the total area, dominating the distribution of rock fragment in the hillslopes.

关 键 词：wind-water erosion crisscross region of the Loess Plateau SMALL CATCHMENT HILLSLOPE SURFACE rock fragment cover and size 

分 类 号：P512.3[天文地球—地质学]