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黄土高原小流域坝地水分时空分布特征 预览

Impact of Layered Deposition on Temporal and Spatial Distribution Characteristic of Soil Moisture of Check Dam Land
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摘要 为有效认识黄土高原淤地坝坝地土壤水分时空分布特征,通过对王茂沟小流域2号坝坝地土壤水分长期监测,分析了坝地土壤水分的统计特征。结果表明:(1)坝地各层土壤水分均表现为中等变异,表层土壤含水量的极差较大,0~2.40m土层土壤平均含水量变化范围为9.92%~23.70%,随深度的增加,土壤平均含水量表现为先减小后增大的趋势;(2)坝地土壤水分具有明显的分层现象,多数监测点的土壤水分在时间上属于中等变异,表层土壤水分变化剧烈,随着深度的增加变异系数开始变小,水分变化程度减弱;根据变异系数的大小,坝地土壤水分可以划分为4个层次:水分剧变层(0~0.20m),水分活跃层(0.20~0.60m),水分次活跃层(0.60~1.40m),水分相对稳定层(1.40m以下);(3)坝前各层土壤含水量均明显高于坝中和坝后,在0~0.40m坝地的含水量明显高于坡地,0.40~1.40m坡地含水量高于坝地,1.40m以下坝地含水量高于坡地,且坝地各层土壤含水量随时间的变异系数均小于坡地。 In order to effectively understand the spatial and temporal distribution characteristics of soil moisture in the check dam land of the Loess Plateau,we analyzed the statistical characteristic of soil moisture in check dam land through the long-term monitoring of soil moisture of the check dam No.2 in the Wangmaogou watershed.The results showed that:(1)the soil moisture in different soil layers moderately varied,among which the range of the surface layer was relatively larger;the water content of layer 0~2.4 m was between 9.92%and 23.70%,which tended to decrease at first and then increase with the increase of soil depth;(2)soil moisture of check dam land had an obvious stratification,which were moderately variable over time in most monitoring sites;the surface soil moisture changed sharply and its variation coefficient began to decrease with the increase of depth,which means the water change degree reduced;based on the variation coefficient,the soil moisture of check dam land could be divided into four levels:the drastic change layer(0~0.20 m),the active layer(0.20~0.60 m),the less active layer(0.60~1.40 m),the relatively stable layer(below1.40 m);(3)soil moisture contents of the different layers in front of dam were obviously higher than those of the dam and behind the dam.The soil moisture between 0~0.4 m and below 1.4 m layers of check dam land were significantly higher than that of slope land,while those between 0.40~1.40 m layer showed an opposite trend,and the variation coefficients of water contents over time of different soil layers in check dam land were all less than those of slope land.
作者 袁水龙 李占斌 张扬 董起广 王丹 YUAN Shuilong;LI Zhanbin;ZHANG Yang;DONG Qiguang;WANG Dan(Institute of Land Engineering and Technology,Shaanxi Provincial Land Engineering Construction Group Co.,Ltd.,Xi′an 710075,China;State Key Laboratory Base of Eco-Hydraulic Engineering in Arid Area,Xi′an University of Technology,Xi′an 710048,China;State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau,Institute of Soil and Water Conservation,Chinese Academy of Sciences and Ministry of Water Resources,Yangling,Shaanxi 712100,China)
出处 《水土保持研究》 CSCD 北大核心 2018年第3期29-34,共6页 Research of Soil and Water Conservation
基金 国家自然科学基金重点项目黄土高原生态建设的生态-水文过程响应机理研究(No.41330858) 陕西省重点科技创新团队计划项目(2016KCT-23).
关键词 淤地坝 分层淤积 土壤水分 时空分布 check dam layered deposition soil moisture temporal and spatial distribution
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