不同灌水量下设施土壤水盐运移规律及数值模拟  

Movement and Numerical Simulation of Soil Water and Salt of Greenhouse Under Different Irrigation Amount

作　　者：吴漩[1] 郑子成[1] 李廷轩[1] 曾礼[1] 

机构地区：[1]四川农业大学资源环境学院,成都611130

出　　处：《水土保持学报》2014年第2期63-68,共6页Journal of Soil and Water Conservation

基　　金：国家自然科学基金项目(40901138);四川省学术和技术带头人培养资金资助项目(2012)

摘　　要：为了寻求防治设施土壤次生盐渍化的最佳灌水量,通过室内土柱模拟试验,分析不同灌水量下设施土壤剖面水分、土壤电导率的变化特征,在此基础上模拟土壤水盐变化趋势,并将模拟结果与试验实测结果进行对比分析。结果表明,不同灌水量对土壤含水量的影响主要集中在30cm以上土层,灌水量过高时土壤剖面含水量反而较低;灌水后25d,各灌水处理在0-30cm土层形成脱盐区,30cm以下土层形成积盐区。土壤水盐分布的模拟结果表明,HYDRUS-1D模型可较好的描述土壤中水盐变化趋势。根据各灌水处理土壤剖面中的水盐分布情况,提出600ml为本试验条件下的最适灌水量。In order to explore the most suitable irrigation amount that could prevent the secondary salinization of greenhouse soil, an indoor soil column test was conducted to study the variation characteristics of soil pro- file moisture and soil electrical conductivity under different irrigation amount. A corresponding model was al- so used to forecast the change trends of soil water and salt. The simulated data had been verified using the measured data. The experiment results showed that variation of soil water content under different irrigation amount mainly concentrated in the layer of 0--30 cm. Water content in soil profile decreased with increasing irrigation amount. The desalt zone of different treatments were formed in the layer of 0--30 cm, and salt ac- cumulation zone were formed in the layer of 30--50 cm. The water and salt prediction showed that HYDRUS --1D model had a high precision for the simulation of water and salt movement. According to the distribution of water and salt under different treatments in the soil profile, 600 ml was considered as the most suitable ir- rigation amount under the experimental conditions.

关 键 词：设施土壤 灌水量 水盐运移 数值模拟 

分 类 号：S275.4[农业科学—农业水土工程] S153.5[农业科学—农业工程]