| 不同近地表水文条件下紫色土坡面土壤侵蚀过程研究 |
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| 引用本文： | 王志刚,郑粉莉,李靖. 不同近地表水文条件下紫色土坡面土壤侵蚀过程研究[J]. 水土保持通报, 2007, 27(6): 9-79 |
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| 作者姓名： | 王志刚 郑粉莉 李靖 |
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| 作者单位： | 1. 西北农林科技大学,资源环境学院,陕西,杨凌,712100;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,陕西,杨凌,712100
2. 西北农林科技大学,资源环境学院,陕西,杨凌,712100 |
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| 基金项目： | 国家重点基础研究发展计划(973计划);国家自然科学基金;西北农林科技大学校科研和教改项目 |
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| 摘 要： | 采用模拟降雨试验,研究了自由下渗(free drainage)、土壤水分饱和(saturation)、壤中流(seepage)3种近地面水文条件下紫色土坡面土壤侵蚀过程.结果表明,近地表水文条件会对紫色土坡面侵蚀过程产生重要影响.在地面坡度5°～15°条件下,当地表水文条件由自由下渗演变为土壤水分饱和时,坡面侵蚀量由1.31～2.02 g/(min·m2)增加到1.83～5.50 g/(min·m2);当地表水文条件由土壤水分饱和变为壤中流时,坡面侵蚀量达到4.40～16.41 g/(min·m2).土壤水分饱和条件下坡面侵蚀量是自由下渗的1.40～2.73倍;壤中流条件下坡面侵蚀量是自由下渗时的3.36～8.12倍,是土壤水分饱和时的2.40～2.98倍.同时,坡面坡度对紫色土坡面侵蚀过程有重要的影响.
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| 关 键 词： | 紫色土 近地表水文条件 壤中流 土壤水分饱和 土壤侵蚀 |
| 文章编号： | 1000-288X（2007）06-0009-03 |
| 收稿时间： | 2007-05-18 |
| 修稿时间： | 2007-07-12 |
Soil Erosion Process on Hillslopes of Purple Soil Under Different Near-Surface Hydrological Conditions |
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| WANG Zhi-gang,ZHENG Fen-li and LI Jing. Soil Erosion Process on Hillslopes of Purple Soil Under Different Near-Surface Hydrological Conditions[J]. Bulletin of Soil and Water Conservation, 2007, 27(6): 9-79 |
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| Authors: | WANG Zhi-gang ZHENG Fen-li LI Jing |
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| Affiliation: | College of Resources and Environmental Sciences,Northwest A & F University,Yangling,Shaanxi 712100,China;State Key Laboratory of Soil Erosion and Arid Farming on Loess Plateau,Institute of Soil and Water Conservation,Chinese Academy of Sciences and Ministry of Water Resources,Yangling,Shaanxi 712100,China;College of Resources and Environmental Sciences,Northwest A & F University,Yangling,Shaanxi 712100,China;State Key Laboratory of Soil Erosion and Arid Farming on Loess Plateau,Institute of Soil and Water Conservation,Chinese Academy of Sciences and Ministry of Water Resources,Yangling,Shaanxi 712100,China;College of Resources and Environmental Sciences,Northwest A & F University,Yangling,Shaanxi 712100,China; |
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| Abstract: | Soil erosion processes on hillslopes of purple soil under three near-surface hydrological conditions of free drainage, saturation and seepage were studied by stimulated rainfall experiments.Results showed that near-surface hydrological conditions greatly affecting soil erosion processes on hillslopes of purple soil.At slope gradients from 5° to 15°, erosion rate from hillslopes shif ted from 1.31 2.02 g/(min?m2) under free drainage to 1.83 5.50 g/(min?m2) under saturation condition; under seepage condition, erosion rate reached to 4.40 16.41g/(min?m2).Erosion rate under saturation condit ion was 1.40 2.73 times greater than that under free drainage; erosion rate under seepage condition was 3.36 812 times greater than that under free drainage and was 2.40 2.98 times higher than that under saturation condition.Meanwhile, slope gradient had a great impact on purple soil erosion processes. |
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| Keywords: | purple soil near-surface hydrological condition seepage saturation soil erosion |
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