利用稀土元素示踪三峡库区小流域模型泥沙来源  

Using REE to Trace Sediment Source from Simulated Watershed in Three Gorges Reservoir Region

作　　者：肖海[1] 刘刚 许文年[4] 夏振尧 杨悦舒 操佩[1] 

机构地区：[1]三峡大学土木与建筑学院,湖北宜昌443002 [2]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 [3]华中农业大学资源与环境学院,武汉430070 [4]三峡地区地质灾害与生态环境湖北省协同创新中心,湖北宜昌443002

出　　处：《水土保持学报》2014年第1期47-52,共6页Journal of Soil and Water Conservation

基　　金：国家自然科学基金项目(41201270);湖北省自然科学基金项目(2012FFB03801);黄土高原土壤侵蚀与旱地农业国家重点实验室基金项目(10501-1211)

摘　　要：通过建立三峡库区小流域模型,实施降雨强度分别为60,90,120mm/h的3场人工模拟降雨,并结合REE示踪技术,对小流域模型侵蚀产沙过程进行定量研究。结果表明:3场降雨中,小流域不同地貌部位侵蚀量随着降雨的持续均呈现不同规律的波动性变化。而在土壤侵蚀量的贡献率方面,除Ⅵ区呈现先急剧减小后趋于稳定及V区呈现增加后减小的趋势外,其他各区均呈现稳定增长并趋于稳定。总体来看,沟道系统的侵蚀贡献率均大于坡面系统,并呈现沟道系统贡献率逐渐减小,坡面系统贡献率逐渐增加的趋势。3场降雨试验的实测土壤侵蚀量与示踪计算土壤侵蚀量对比,证明示踪结果具有一定准确性。A watershed model was established based on a field survey of a small watershed located in Three Gorges Reservoir region. REE tracing method was applied to investigate the soil erosion process from different positions of small watershed, during three simulated rainfall events which intensities were 60, 90, 120 mm/h. The results showed that the erosion amount from different landscape positions fluctuates irregularly during th then stab then stab ree rainfall events. Meanwhile, the erosion contribution rate of region VI firstly decreased sharply ilized, that of region V firstly increased then decreased, and that of other regions increased steadily ilized. Overall, the erosion contribution rate of channel system was greater than that of the slope system. The former decreased slowly while the latter increased gradually. Results could provide technical reference for applying REE tracing method to the watershed in Three Gorges Reservoir region and theoretical basis for soil and water conservation in this area.

关 键 词：REE示踪 三峡库区 紫色土 小流域 土壤侵蚀 

分 类 号：S157.1[农业科学—土壤学]