黄丘区自然草地对坡面土壤入渗的影响机制

发布时间：2018-03-17 07:23

本文选题：模拟降雨　切入点：土壤入渗率　出处：《人民黄河》2017年06期 　论文类型：期刊论文

【摘要】：利用野外人工模拟降雨试验,研究了草地覆盖度变化对土壤入渗过程的影响,定量分析了草地作用下入渗参数的变化规律。结果表明:草地覆盖度对土壤入渗率的影响存在着分级现象,36%~54%覆盖度范围内入渗率随着覆盖度增大而增大的幅度并不大,只有当草地覆盖度超过59%之后,入渗率才明显增大;草地具有削减入渗波动的能力;Horton和Philip入渗公式均能有效地反映不同植被覆盖度下降水在土壤中的入渗过程及特性;草地覆盖能有效增大土壤初始入渗率和稳渗率,并且土壤初始入渗率以及稳渗率与草地覆盖度均可用指数函数关系表示;草地覆盖度越高,初始入渗率和稳渗率相差越小,入渗率衰减得越慢。
[Abstract]:The effects of grassland coverage on soil infiltration were studied by artificial rainfall simulation in the field. Quantitative analysis was made on the variation of infiltration parameters under the action of grassland. The results showed that the effect of grassland coverage on soil infiltration rate was classified into three stages: the infiltration rate increased with the increase of coverage, and the infiltration rate was not large in the range of 54% coverage. Only when the coverage of grassland exceeded 59%, the infiltration rate increased significantly, and both Horton and Philip infiltration formulas could effectively reflect the infiltration process and characteristics of the decreased water in soil with different vegetation coverage. Grassland mulching can effectively increase the initial infiltration rate and stable infiltration rate, and the initial infiltration rate, the stable infiltration rate and the grassland coverage can be expressed by exponential function, the higher the grassland coverage, the smaller the difference between the initial infiltration rate and the stable infiltration rate. The slower the infiltration rate decays.
【作者单位】：河海大学港口海岸与近海工程学院;黄河水利科学研究院水利部黄土高原水土流失过程与控制重点实验室;
【基金】：河南省创新型科技人才队伍建设工程项目(162101510004) 国家自然科学基金资助项目(41571276) 水利部黄土高原水土流失过程与控制重点实验室基金资助项目(20I6-01) 国家重点研发计划项目(2016YFC0402402)
【分类号】：S152.7

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