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不同上方来水模式下工程堆积体坡面的植被调控
Authors
冯志倩
娄永才
+6 more
张恒
李永红
苏媛
陈卓
高照良
齐星圆
Publication date
1 January 2019
Publisher
Abstract
为揭示植被格局对工程堆积体坡面水沙调控的影响,采用野外模拟径流冲刷试验,分析了 4 种上方来水模式(均 匀型、峰值前型、峰值中型和峰值后型)下坡面 5 种覆草格局(裸坡、坡顶聚集、坡中聚集、坡底聚集和带状格局)的 侵蚀特征。结果表明:水流功率与土壤剥蚀率之间相关性最高且呈极显著幂函数关系(R2 =0.47~0.72,P<0.01),是描述 堆积体侵蚀动力机制的最优参数。植被格局的减流效益在 12.23%~49.62%之间,减沙效益在 12.92%~80.54%之间,减 沙效益高于减流效益;带状和坡顶聚集格局的平均减流减沙效益分别为 43.87%、58.09%和 30.55%、54.41%,显著优于 其他植被格局,在治理堆积体水土流失时应优先考虑这两种植被格局。植被格局下侵蚀泥沙中砂粒含量较对照小区减小 了 18.79%~35.80%,黏粒含量增加了 3.56%~10.69%,表明植被对砂粒的拦截效果显著;侵蚀泥沙颗粒体积分形维数主 要由黏粒体积分数决定,两者呈极显著线性相关关系(R2 =0.90,P<0.01)。植被格局的砂粒富集率较对照小区相对减小, 黏粒富集率相对增加,体积分形维数增大;侵蚀泥沙中黏粒和砂粒迁移方式以团粒为主,粉粒则以单粒为主。该研究可 为工程堆积体水土流失植被防控措施的配置提供参考。</div
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Institute of Soil and Water Conservation,Chinese Academy of Sciences and Ministry of Water Resources
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Last time updated on 24/05/2021