无压灌溉土壤湿润体含水率分布规律与模拟模型研究  

Distribution rule of soil moisture and simulation model in wetting front under non-pressure irrigation

作　　者：赵伟霞[1] 蔡焕杰[1] 陈新明[1] 单志杰[1] 王健[1] 

机构地区：[1]西北农林科技大学水建学院,杨凌712100

出　　处：《农业工程学报》2007年第3期7-12,共6页Transactions of the Chinese Society of Agricultural Engineering

基　　金：国家自然科学基金(50479051);农业科技成果转化资金(04EFN217100395);西北农林科技大学研究生创新教育计划

摘　　要：该文通过室内试验,分析研究了无压灌溉土壤入渗率变化过程和土壤湿润体内含水率分布规律。试验结果表明:无压灌溉的累计入渗量与时间呈幂指数关系,土壤入渗率趋于零是无压灌溉过程结束的标志。同时,引进场的概念,结合土壤含水率试验数据,建立了无压灌溉土壤湿润体内含水率分布的理论模拟模型,并用实测值进行了验证。该模型简单、实用、精度高,实测值与预测值之间具有较高的相关性,相关系数达0.899以上。该研究结果对大田土壤水分调节和管理具有指导作用。Through laboratory experiments, the variable process of soil infiltration rate and the distribution rule of soil moisture in wetting front were analyzed. Results show that the relationships between time and cumulative infiltration is a power function. The infiltration rate trend to zero is the sign to finish the infiltration. Through the concept of field and the experimental data of soil moisture, the simulation model of soil moisture in wetting front under non-pressure irrigation was established, and the model was tested with measured values. Results show that the experimental equation of soil moisture is simple, practical and has higher precision. The correlation coefficient between the measured value and the calculated value is above 0. 899. The research result is important to guide the soil water adjustment and management.

关 键 词：无压灌溉 入渗率 湿润体 含水率 模拟模型 

分 类 号：S275.4[农业科学—农业水土工程] S152.7[农业科学—农业工程]