控制性交替灌溉情况下土壤蒸发的预测研究  

Research on Prediction of Soil Evaporation under Controlled Alternative Irrigation

作　　者：李彩霞[1] 陈晓飞[2] 王铁良[2] 杨国范[2] 郑淑红[2] 汪明霞[2] 

机构地区：[1]中国农业科学院农田灌溉所,河南新乡453003 [2]沈阳农业大学水利学院,辽宁沈阳110161

出　　处：《节水灌溉》2007年第3期29-31,共3页Water Saving Irrigation

基　　金：国家自然科学基金资助项目(40272102)

摘　　要：为了了解沈阳地区潮棕壤土条件下玉米田不同控制性交替灌溉制度下的土壤蒸发变化规律,对土壤蒸发进行预报,采用Micro-lysimeters(MLS)对不同灌溉处理下的土壤蒸发量进行了测定,并建立了以气象因子、土壤含水率和叶面积指数为自变量的土壤蒸发的预报模型。结果表明,在本试验的条件下,各处理的相对土壤蒸发率(E/ET0)与表层土壤含水率(θ)的关系均呈指数函数形式,决定系数在0.72以上。各处理的E/ET0与LAI之间亦呈很好的指数函数关系,决定系数均在0.79以上。说明在缺少土壤蒸发资料的情况下,可以通过ET0与θ及叶面积指数LAI来预报土壤蒸发。To study the change rule of soil evaporation in maize field under different controlled alternative irrigation scheduling in Shengyang region and predict the soil evaporation, the soil evaporation under different irrigation treatments was measured with micro -lysimeters, and the predict model, which took weather factor, soil water content and leaf area index （LAI） as free variables, was set up in this paper. The research results showed that the relationship between the relative soil evaporation rate （E/ETo） and the surface soil water content θ of each treatment under controlled alternative irrigation was well fitted by exponential function, the determinant coefficient was more than 0. 72. The relationship between the relative soil evaporation rate （E/ETo） and the leaf area index （LAI） was well fitted by exponential function, the determinant coefficients was more than 0. 79. The results indicated that soil evaporation rate E could be predicted by ETo and LAI, or by meteorological data and θ when the soil evaporation data was absent.

关 键 词：土壤蒸发 土壤含水率 叶面积指数 控制性交替隔沟灌溉 

分 类 号：S165.2[农业科学—农业气象学]