摘要
以宁夏平罗县陶乐镇马太沟村220 hm^2暗管排水工程为研究区域,通过野外观测试验,利用10个观测井监测了暗管排水改良盐碱地的地下水动态、全盐量和pH值的自然变化特征。结果表明:暗管排水工程对地下水埋深的控制作用明显,可将地下水埋深控制在1.5~2.0 m;暗管排水条件下,土壤全盐量受地下水埋深下降影响而降低,二级暗管强排区的表层土壤全盐量降到1.74 g/kg以下,一级排水区降到0.7 g/kg以下,下层土壤均已下降到0.98 g/kg以下,即含盐量小于0.3%不影响作物出苗率;暗管排水条件下,土壤的pH值在灌溉季有微弱上升,但灌溉结束后pH值下降,总体下降到9以下。
220 hectares submerged tube drainage project of Ma Tai Gou Village,Tao Le Town,Pingluo County,Ningxia Hui Autonomous Region was taken as the study area.Through the field observation test,the dynamic changes of groundwater,total salt content and pH of salinized soils were monitored by 10 observation wells.The results show that the underground pipe drainage controls the underground water depth significantly.The groundwater depth is controlled between 1.5 to 2.0 m;On the condition of pipe drainage,the total salt content of soil decreases with groundwater depth decreasing.In top soil of the second-level underground pipe,the total salt content is less than 1.74 g/kg and in first-level drainage area it is below 0.7 g/kg.What’s more,the salt content has been reduced to below 0.98 g/kg in the lower soil(less than 0.3%salinity),which means it does not affect crop emergence rate.Under the condition of pipe drainage,there is a slight increase on pH of the soil in the irrigation season.But after irrigation pH would decrease.In the end,pH would drop to below 9 overall.
作者
纪敬辉
王红雨
JI Jinghui;WANG Hongyu(School of Civil Engineering and Hydraulic Engineering,Ningxia University,Yinchuan 750021,China;Engineering and Technology Research Center of Water-Saving and Water Resource Regulation in Ningxia,Yinchuan 750021,China)
出处
《宁夏工程技术》
CAS
2018年第1期71-75,共5页
Ningxia Engineering Technology
基金
国家自然科学基金资助项目(41462010)
宁夏大学研究生创新资助项目(GIP201635)
关键词
暗管排水
地下水埋深
全盐量
PH值
pipe drainage
groundwater depth
total salt content
pH
