LI Yan-mei,WANG Ke-qin,CHEN Qi-bo,et al.Effect of Reconstructed Micro-slope on Soil Moisture Dynamics Parameter in Jinshajiang Dry-Hot River Valley[J].Research of Soil and Water Conservation,2008,15(04):19-23.
金沙江干热河谷微地形改造对土壤水分运动参数的影响研究
- Title:
- Effect of Reconstructed Micro-slope on Soil Moisture Dynamics Parameter in Jinshajiang Dry-Hot River Valley
- 分类号:
- S714.2;S715
- 摘要:
- 以云南元谋干热河谷典型坡面上改造后的微地形为研究对象，对集中降雨条件下的土壤水分进行动态监测，运用土壤水分动力学原理和水量平衡原理，分析计算改造微地形的土壤水分特征曲线、土壤水分通量、导水率和扩散率，结果表明：微地形改造后，强化了降雨的入渗，水平沟整地和水平台整地分别能将89%和83%的降雨转化为土壤水分，而自然坡面只有22%的天然降雨转化为土壤水分，集中降雨后，土壤水分以垂直入渗为主，土壤水分以零通量面为界，在零通量面以上水分向上运动，零通量面以下向下运动，改造后微地形土壤水分运移动速度明显增大，最大运移速度大约为15～17 cm/d，但随着坡度增加，土壤水分的侧向损失有所增加，在集中降雨条件下，水平台、水平沟整地后能使拦截的降雨在0-200 cm土层范围进行分配，且缓坡上的水平台能使100 cm以下的土壤水分得到明显改善，而自然坡面入渗的水分主要在0-100 cm范围分配，且改善土壤水分效果不好，100 cm以下土层，降雨后土壤水分仍维持在较低水平。
- Abstract:
- Taking reconstructed micro-slope on typical slope in Yuanmou dry-hot river valley as research object, by monitoring soil water dynamics, this paper analyzes and calculates soil water characteristic curve, soil water flux, conductivity and diffusivity of reconstructed micro-slope with soil water dynamics principle and water equilibrium principle. The results show that reconstructed micro-slope enhances the permeating of rain, contour terrace and contour trench could respectively converse 89% and 83% rainfall into soil water, but natural slope only could converse 22% rainfall into soil water. Soil water mainly permeates at perpendicular direction, and moves upward on zero flux noodles, gets down under zero flux noodles after concentration rain. Reconstructing micro-slope makes the speed of water movement increase, and the biggest speed increased 15~17 cm/d. With the depth increases of soil profile, the lost of soil water on the side increases correspondently. The intercepted rain of contour terrace and contour trench can be assigned in 0-200 cm soil layer, contour terrace on gentle slop may make water under 0-100 cm soil layer increase obviously, and the permeating water of natural slop mainly is assigned in 0-100 cm soil layer, water under 0-100 cm soil layer always keeps very low.
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相似文献/References:
[1]杨艳鲜,纪中华,方海东,等.元谋干热河谷旱坡地复合生态农业模式效益研究初评[J].水土保持研究,2005,12(04):88.
YANG Yan-xian,JI Zhong-hua,FANG Hai-dong,et al.Study and Preliminary Evaluation on the Benefit of Models of Compound Eco-agriculture on Dry Slope Land in Yuanmou Dry Hot Valley[J].Research of Soil and Water Conservation,2005,12(04):88.
备注/Memo
收稿日期:2007-9-20。
基金项目:国家自然科学基金项目（30660037）；云南省科技计划项目（2006SG20）；云南省自然科学基金项目（2006D0041M）；云南省教育厅基金项目04Y424B资助
作者简介:李艳梅（1978- ），女，云南昆明人，讲师，硕士，从事退化生态系统生态恢复理论与技术研究。E-mail：kmlymei@126.com
通讯作者:王克勤（1964- ），男，甘肃庄浪人，教授，主要从事小流域综合治理的理论与技术研究。E-mail：kqwang@swfc.edu.cn