摘要
为探明微润灌对土壤水盐运移的影响,以南疆盐碱土为研究对象,采用室内模拟试验,分析了不同初始含水率(0%、4%、8%、12%)条件下微润灌土壤水盐分布特征。结果表明,土壤累计入渗量及平均入渗率均随着土壤含水率的升高而逐渐下降,成负相关关系;不同初始含水率湿润体在垂直方向上均处于微润带埋设位置偏下,水平方向上成左右对称关系;土壤初始含水率对湿润锋运移距离及湿润体的大小影响较小;随着初始含水率的逐渐增大,等值线图逐渐变疏,土壤水势梯度降低;初始含水率对湿润体内平均含水率影响较小;土壤脱盐区范围及脱盐率随着初始含水率的增大逐渐降低,两者成负相关关系。
In order to identify the effect of moistube-irrigation on water and salt movement,the saline-alkali soil irrigated by moistube was selected as the research object,the soil water and salt distribution characteristics were analyzed under different initial water content(0%,4%,8%,12%)by laboratory simulation test.The results showed that soil cumulative infiltration rate and the average infiltration rate were decreased with the increase of soil water content;each horizontal distribution of moisture was symmetric about the center of buried moistube.Each vertical distribution of moisture area under different buried depths was under the buried depths.Soil wetting pattern was under the embedding position and symmetric about the center of buried moistube.The size of the wetting front transport distance and wetting body changed small.Contour map was gradually sparse,soil water potential gradient was reduced.The average water content in the soil wetting pattern was small changed with initial soil water content.The range of soil desalting and desalting rate were decreased with the increase of initial soil water content.
作者
张强伟
亢勇
ZHANG Qiang-wei;KANG Yong(College of Water Resource and Architectural Engineering,Tarim University,Alar Xinjiang 843300)
出处
《现代农业科技》
2018年第13期183-186,共4页
Modern Agricultural Science and Technology
基金
塔里木大学大学生创新训练计划项目(201610757064)
关键词
盐碱土
初始含水率
微润灌
土壤水盐
saline-alkali soil
initial water content
moistube-irrigation
soil water and salt
