| 集中水流内红壤分离速率与团聚体特征及抗剪强度定量关系 |
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| 引用本文： | 王军光,李朝霞,蔡崇法,杨伟,马仁明,张国彪.集中水流内红壤分离速率与团聚体特征及抗剪强度定量关系[J].土壤学报,2011,48(6):1133-1140. |
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| 作者姓名： | 王军光 李朝霞 蔡崇法 杨伟 马仁明 张国彪 |
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| 作者单位： | 华中农业大学农业部亚热带农业资源与环境重点实验室,武汉,430070 |
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| 基金项目： | 国家自然科学基金项目（面上项目，重点项目，重大项目） |
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| 摘 要： | 为明确红壤结构特征与抗剪强度对坡面土壤分离能力的影响,选取8种典型红壤为研究对象,通过团聚体稳定性分析,饱和抗剪强度测定,和室内模拟冲刷试验,就各参数间定量关系进行了初步探讨。研究结果表明:团聚体稳定性特征参数As集合了红壤团聚体破碎的主要机制,与不同水流剪切力中红壤分离速率有较好的相关性;红壤饱和抗剪强度(σs)与集中水流内临界水流剪切力(τc)呈较好的线性关系。基于WEPP细沟侵蚀模型,将团聚体稳定性特征参数As代替可蚀性因子Kc,饱和抗剪强度(σs)代替临界水流剪切力(τc),得出新的预测方程。结果显示预测方程能准确的预测坡面集中水流内红壤分离速率(R2=0.887 1)。该结果为深入研究红壤侵蚀机理提供了新思路,对完善侵蚀物理过程模型具有重要的意义。
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| 关 键 词： | 集中水流 红壤分离速率 团聚体稳定性 饱和抗剪强度 |
| 收稿时间： | 3/17/2011 9:58:02 PM |
| 修稿时间： | 5/23/2011 9:13:37 AM |
Quantitative relationships of detachment rate of red soil in concentrated flow with soil aggregate characteristics and soil shear strength |
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| wangjunguang,lizhaoxi,caichongf,yangwei,marenming and zhangguobiao.Quantitative relationships of detachment rate of red soil in concentrated flow with soil aggregate characteristics and soil shear strength[J].Acta Pedologica Sinica,2011,48(6):1133-1140. |
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| Authors: | wangjunguang lizhaoxi caichongf yangwei marenming and zhangguobiao |
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| Institution: | Huazhong Agricultural University,Huazhong Agricultural University,Huazhong Agricultural University,Huazhong Agricultural University,Huazhong Agricultural University,Huazhong Agricultural University |
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| Abstract: | In order to determine effects of structure characteristics and shear strength of red soil on soil detachment,relationships of soil detachment rate with soil aggregate characteristics and shear strength of the red soil were studied through indoor simulated erosion experiment with concentrated flows.Eight typical types of red soils were chosen for the study.Results show that aggregate stability index(As) integrated main mechanisms of aggregate breakdown,and was found to be well related with soil detachment ra... |
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| Keywords: | Concentrated flow Red soil detachment rate Aggregate stability Soil shear strength |
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