• 气候与水文过程 •

细沟侵蚀影响因素和临界条件研究进展

1. 1. 中国科学院地理科学与资源研究所陆地水循环与地表过程重点实验室, 北京100101;
2. 中国科学院研究生院, 北京100049;
3. 中国科学院水利部水土保持研究所黄土高原土壤侵蚀与旱地农业国家重点实验室, 杨凌712100;

4. 华中农业大学资源与环境学院, 武汉430070
• 收稿日期:2010-01-01 修回日期:2010-05-01 出版日期:2010-11-25 发布日期:2010-11-25
• 通讯作者: 蔡强国(1946-)，研究员，从事土壤侵蚀、水土保持、流域侵蚀产沙模拟研究
• 作者简介:李君兰(1986-)|女|四川广安|硕士研究生|主要从事坡面土壤侵蚀等研究
• 基金资助:

国家自然科学基金项目(40971165)；国家自然科学基金重点项目(40635027)；中国科学院水利部黄土高原土壤侵蚀与旱地农业国家重点实验室开放基金课题项目(10501-265)

Reviewing on Factors and Critical Conditions of Rill Erosion

LI Junlan1,2, CAI Qiangguo1,3, SUN Liying1, CHEN Xiao'an1,4

1. 1. Key Laboratory ofWater Cycle and Related Land Surface Processes, Institute of Geographical Sciences and Natural Resources Research, CAS, Beijing 100101,China;

2. Graduate School of the Chinese Academy of Science, Beijing 100049;
3. China National Laboratory of Soil Erosion and Dryland Agriculture on the Loess Plateau,Institute of Soil andWater Conservation, CAS, Yangling, 712100;
4. College of Resources and Environment, Huazhong Agriculture University,Wuhan, 430070
• Received:2010-01-01 Revised:2010-05-01 Online:2010-11-25 Published:2010-11-25

Abstract:

Rill erosion plays an important role in soil erosion process in loess hillslopes. It is a quantum leap during the process of soil erosion on slopes, and also is the beginning of a qualitative change in the process of soil erosion. On the basis of studying many papers, the authors review the study of factors and critical conditions of rill erosion. Rainfall and runoff, soil, topography, soil surface characteristics and land management all have their impact on rill erosion. On the one hand, researches use a variety of parameters to represent the impact of rainfall and runoff, soil, topography and land management. On the other hand, there are two forms of soil surface characteristics, namely, surface roughness and surface soil crust. The studies on the impacts of both of them are still in a qualitative research stage, and some studies have shown they can weaken rill erosion, the other studies concluded that they would exacerbate the occurrence of rill erosion. The generation of rill on the slopes needs certain conditions, and the critical runoff, soil and terrain conditions have their corresponding research results. The critical conditions for the generation of rill are not numbers, but are related to many factors. Critical conditions for rill erosion are not fixed values, but all of them should be a comprehensive index of other factors. At the same time, the future possible research direction and contents of the influencing factors and the critical conditions of rill erosion are pointed out. More experiments and field observation data are needed. In rill erosion factors research, the following points need further works: (1) the quantitative analysis of the impact of rainfall and runoff on the joint action of rill erosion; (2) screening key indicators to represent the effect of soil, topography and land management factors; (3) an in-depth study on how the soil surface characteristics affect rill erosion, and a quantitative analysis of the impact of surface roughness and soil crust on rill erosion; (4) the interaction of various factors with the impact of rill erosion. Meanwhile, the studies of critical conditions of rill erosion need more investments, which include: (1) exploring the critical rainfall conditions for rill erosion, and finding out its relationship with critical runoff conditions, (2) a systematic study on the critical conditions in different areas, to obtain a judgment with strong applicability about whether rill erosion will occur.