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| 2次降雨条件下不同土壤细沟侵蚀分析 | |
| 引用本文： | 刘俊体,孙莉英,张学培,蔡强国,陈俊杰.2次降雨条件下不同土壤细沟侵蚀分析[J].中国水土保持科学,2013,11(4):22-29. |
| 作者姓名： | 刘俊体 孙莉英 张学培 蔡强国 陈俊杰 |
| 作者单位： | 1. 北京林业大学水土保持学院,100083,北京;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,100101,北京 2. 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,100101,北京 3. 北京林业大学水土保持学院,100083,北京 4. 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,100101,北京;华中农业大学水土保持研究中心,430070,武汉 |
| 基金项目： | 国家自然科学基金“坡面水蚀动力与细沟发育形态的相互作用机制及其影响因素”（41271304）、“东北典型黑土区坡耕地水土保持措施对地表径流及其侵蚀的调控和机理研究”（41001165）; 黄土高原土壤侵蚀与旱地农业国家重点实验室开放基金“黄土坡面细沟侵蚀发育过程影响因素研究”（K318009902-1315） |
| 摘 要： | 不同土壤细沟侵蚀发育对比研究是探讨细沟侵蚀机制的必要内容。通过间隔为24 h的2次人工模拟降雨,在不同降雨强度(1.5,2.0,1.0 mm/min)、不同坡长(5、10 m)的试验条件下,分析坡度为20°时塿土和黄绵土2种土壤细沟侵蚀过程中产流产沙、空间变化的差异。结果表明:1)从坡面产流量来看,2种土壤在2次人工降雨过程中有相似的产流过程,坡长和降雨强度相同时,塿土坡面产流量大于黄绵土;2)从坡面形态看,第1场降雨过程中塿土坡面表面积、细沟侵蚀强度大于黄绵土坡面,但黄绵土坡面一旦发生细沟侵蚀,其体积变化幅度剧烈于塿土坡面;3)塿土在第1场降雨过程中侵蚀速率的变化过程可以反应细沟发育的各个阶段,较大降雨强度使黄绵土发生细沟侵蚀侵蚀,其细沟发育的各个阶段持续时间长于塿土,即黄绵土细沟形态变化缓慢。 |
| 关 键 词： | 产流 坡面表面积 细沟体积 细沟发育 |
Analysis of two kinds soil rill evolution under the secondary rainfall |
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| Liu Junti , Sun Liying , Zhang Xuepei , Cai Qiangguo , Chen Junjie.Analysis of two kinds soil rill evolution under the secondary rainfall[J].Science of Soil and Water Conservation,2013,11(4):22-29. | |
| Authors: | Liu Junti Sun Liying Zhang Xuepei Cai Qiangguo Chen Junjie |
| Institution: | 1. College of Soil and Water Conservation, Beijing Forestry University, 100083, Beijing, China; 2. Key Laboratory of Water Cycle and Related Land Surface Processes, Institute of Geographical Sciences and Natural Resources Research, Chinese Academy of Sciences, 100101, Beijing, China; 3. College of Resources and Environment, Huazhong Agriculture University, 430070, Wuhan, China) |
| Abstract: | It is necessary to study different soil rill erosion for investigating rill erosion mechanism. In this paper, the secondary simulated rainfall experiments with an interval of 24 hours were conducted, with different slope lengths （5,10 m） and different rainfall intensities （1.5,2.0,1.0 mm/min）, to study the differences of runoff and sediment yield and rill space about 2 kinds soil rill erosion developments. Results showed that two kinds of soil shared similar runoff process. At the same rainfall intensity and slope length, lou soil slope surface runoff was greater than the loessial soil. In the first rainfall, the slope surface area and rill erosion intensity of lou soil was greater than the loessial soil. Once the rill erosion occured in the loessial soil slope surface, the volume variations of loessial soil was strongly than lou soil. The change process of the erosion rate could reflected lou soil rill stages of development. Rill erosion would happen with larger rainfall intensity in the loessial soil, and the duration time for stages was longer than lou soil, i. e. , Loessial soil rill morphological changed slowly. |
| Keywords: | runoff slope surface area rill volume rill development |
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