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| 坡耕地小区坡面不同坡段侵蚀泥沙贡献率的7Be示踪研究 | |
| 引用本文： | 张风宝,杨明义,王光谦.坡耕地小区坡面不同坡段侵蚀泥沙贡献率的7Be示踪研究[J].泥沙研究,2011(1). |
| 作者姓名： | 张风宝 杨明义 王光谦 |
| 作者单位： | 1. 西北农林科技大学,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;中科院、水利部水土保持研究所,陕西,杨凌,712100;清华大学,水沙科学与水利水电工程国家重点实验室,北京,100084 2. 中科院、水利部水土保持研究所,陕西,杨凌,712100 3. 清华大学,水沙科学与水利水电工程国家重点实验室,北京,100084 |
| 基金项目： | 国家重点基础研究发展规划“973”(编号:2007CB407201); 国家青年科学基金(40901127); 教育部“新世纪优秀人才”支持计划资助 |
| 摘 要： | 侵蚀泥沙来源的研究对深化侵蚀规律的认识,优化水土保持措施的配置等有重要的意义。本文利用7Be示踪技术结合传统的土壤侵蚀研究方法,通过建立不同坡度的径流小区,分别探讨了坡耕地小区坡面不同坡段片蚀、细沟侵蚀对侵蚀泥沙的贡献率及小区泥沙输移比。研究发现,片蚀主要发生在小区坡面距坡顶0～2m区域,占总片蚀量的60%以上,细沟侵蚀主要发生在小区坡面距坡顶2～5m区域,占总细沟侵蚀总量的75%以上,总体而言,侵蚀泥沙主要来源于小区坡面距坡顶1～4m区域,上部和下部泥沙贡献相对较小。对于降雨强度高的15°小区,片蚀泥沙几乎来自与全坡面,坡面不同坡段对总侵蚀泥沙的贡献率从坡顶向坡脚呈增加趋势。利用7Be示踪计算出各小区泥沙输移比在0.643～0.979之内,除5°小区外,其它小区泥沙输移比都大于0.9。 |
| 关 键 词： | 泥沙贡献率 7Be示踪 坡耕地小区 泥沙输移比 |
Using 7Be measurement to document contribution rate of sediment from different parts of cultivated runoff plots |
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| ZHANG Feng-bao,YANG Ming-yi,WANG Guang-qian.Using 7Be measurement to document contribution rate of sediment from different parts of cultivated runoff plots[J].Journal of Sediment Research,2011(1). | |
| Authors: | ZHANG Feng-bao YANG Ming-yi WANG Guang-qian |
| Affiliation: | ZHANG Feng-bao1,2,3,YANG Ming-yi2,WANG Guang-qian3(1.State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau,Institute of Soil and Water Conservation,Northwest A&F University,Yangling Shaanxi 712100,China,2.Institute of Soil and Water Conservation,Chinese Academy of Sciences and Ministry of Water Resources,Yangling Shannxi 712100,3.State Key Laboratory of Hydroscience and Engineering,Tsinghua University,Beijing 100084,China) |
| Abstract: | The research of sediment source is significantly important for studying soil erosion and designing soil and water conservation measures on slopes.Combined with traditional methods,using 7Be measurement to document the contribution rate of sediment from different parts of the cultivated runoff plots is conducted in this paper.The sediment caused by sheet erosion was mainly derived from the part of 0-2m away from the slope top,accounting for over 60% of the total sheet erosion amount.The sediment caused by ri... |
| Keywords: | contribution rate of sediment 7Be measurement cultivated runoff plot SDR |
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