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当前位置: 首页 > 文章 > 负水头条件下水质对湿润体运移及水盐分布的影响 农业机械学报 2013,44 (5) 101-107
Position: Home > Articles > 负水头条件下水质对湿润体运移及水盐分布的影响 Transactions of the Chinese Society for Agricultural Machinery 2013,44 (5) 101-107

负水头条件下水质对湿润体运移及水盐分布的影响

作  者：
肖娟;江培福;郭秀峰;邱照宁;范肖予
单  位：
山西农业大学林学院;中国水利水电科学研究院水利研究所;太原理工大学水利科学与工程学院
关键词：
负水头灌溉;水质;钠吸附比;湿润体;水盐分布
摘  要：
通过室内试验,分析了负水头供水条件下,灌溉水钠吸附比和盐分浓度对湿润体运移及水盐分布的影响.结果表明,湿润体的最大水平湿润距离、最大垂直湿润距离以及累积入渗量均与时间呈幂指数关系,并随着灌溉水盐分浓度的增加和钠吸附比的减小而增加;湿润体内土壤含水率和电导率的分布近似为一组同心椭球面,并与湿润体半椭圆在水平方向的半轴平方呈线性关系,随着半轴的增加,土壤含水率减小,而电导率增加;灌溉水盐分浓度一定的条件下,随着钠吸附比的增加,湿润体内的平均含水率减小,平均电导率增加,在钠吸附比一定的条件下,灌溉水盐分浓度对两者的影响较小.
单  位：
College of Water Resources Science and Engineering,Taiyuan University of Technology,Taiyuan 030024,China Department of Irrigation and Drainage,China Institute of Water Resources and Hydropower Research,Beijing 100048,China College of Forestry,Shanxi Agricultural University,Taigu 030801,China
关键词：
Negative hydraulic irrigation Water quality Sodium adsorption ratio Wetted soil volume Salt-water distribution
摘  要：
Effect of the sodium adsorption ratio(SAR) and salt concentration of irrigated water on soil water infiltration and salt-water distribution in wetted soil volume under negative hydraulic head were analyzed by laboratory experiments.Results indicated that the relationships between each next parameter and time,maximal horizontal wetted distance(X),maximal vertical wetted distance(Z),and accumulated infiltration(I) were a power function.X,Z and I increased with the increasing of salt concentration and decreasing of SAR.The distribution of water content and electric conductivity in wetted soil volume could be described as a series of concentric ellipsoid,and had the linear relationship with the square of semi-axis of ellipse(A2).With the increasing of A,water content decreased and electric conductivity increased in wetted soil volume.With the increasing of SAR,average soil water content decreased and average electric conductivity increased under certain salt concentration.Salt concentration had no significant impact on average soil water content and average electric conductivity under certain SAR.

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