水土保持学报2017，Vol.31Issue(5)：139-144,6.DOI:10.13870/j.cnki.stbcxb.2017.05.022
径流冲刷条件下冻融坡面产沙时空分布
Spatio-temporal Distribution of Slope Sediment Yield in Under the Condition of Freezing and Thawing
摘要
Abstract
In order to determine the temporal and spatial distribution of slope soil erosion and sediment yield under the condition of freeze-thaw cycle,rare earth element (REE) tracing technology was used in the study.Specifically,two gradients (10°,15°),four initial thawing depths (2,5,10 and 15 cm) and four water flows (4.5,6.5,8.5 and 10.5 L/min) were designed to analysis the temporal and spatial variation of soil erosion and sediment yields.The results showed that the soil erosion and sediment yield increased with the increase of gradient and flow under the condition of the same initial thawing depth.The harvest soil erosion occurred in the first slope segment,which accounted for 68.24 ％ of the total sediment yield,while the sediment yield was steady in third slope segment.The erosion and sediment yield increased with the increase of initial thawing depth and flow under the same slope gradient.The erosion and sediment yield reduced gradually with the slope and soil depth directions in freeze-thaw slope;In the La element tracer area,the sediment yield increased firstly,and then decreased,in other element tracer areas,the change of sediment yield was basically consistent with that of the La element tracer area.关键词
冻融坡面/初始解冻深度/稀土元素示踪技术/产沙量Key words
freezing and thawing slope/initial thawing depth/rare earth element tracing technology/sediment yield分类
农业科技引用本文复制引用
张凯,王瑄,周丽丽,鲍永雪..径流冲刷条件下冻融坡面产沙时空分布[J].水土保持学报,2017,31(5):139-144,6.基金项目
国家自然科学基金项目(41471225) （41471225）
辽宁省农业领域青年科技创新人才培养计划(2014054) （2014054）
