Comparison of Rill Erosion on Purple Soil and Dry-hot Soil
Rill erosion is the initial stage that erosion form changing from sheet erosion to gully erosion, and has an important contribution to soil loss of watersheds. In heavy soil loss areas, rill erosion is often serious. Therefore, researches focused on rill erosion in serious soil loss area will be an important guiding role to prevent soil loss. In China, wide researches have been done in the Loess Plateau, but little information about rill erosion can be found in Upper Yangtze River basin where being considered as another key area for soil conservation at present. This study focused on two typical soils in this area which are prone to erosion. By using runoff scoring experiments, rill erosion on purple soil and dry-hot soil were compared. The results showed: The rill erosion rate of dry-hot soil was greater than that of purple soil; the average rill erosion rate of dry-hot soil was 14.3 times of purple soil, and the maximum difference was 73 times. By using the rill erosion model in WEPP, rill erodiblility of purple soil was determined as 0.002s/m, the critical sheer was 5.25 Pa, and rill erodiblility of dry-hot soil was of 0.0061 s/m, the critical sheer was 10.8 Pa.
Rill erosion Rill erodiblility Critical sheer Purple soil Dry-hot soil
Fu Bin Wang Yukuan Xu Pei Wang xiantuo
Key Laboratory of Mountain Hazards and Earth Surface Process, the Chinese Academy of Sciences, Cheng Chongqing Intemational Investment Consultation Group co., ltd, Chongqing 400020, China
国际会议
西安
英文
59-62
2010-10-11（万方平台首次上网日期，不代表论文的发表时间）