修正双作物系数法估算不同计划湿润层深度下春玉米蒸散  

Estimation of Spring Maize Evapotranspiration Under Different Soil Wetted Depths Using the Modified Dual Crop Coefficient Method

作　　者：薛未 吴雅娟 肖娟[1] 靳忠豪 马新博 刘宏武 武朝宝 武金权 XUE Wei;WU Ya-juan;XIAO Juan;JIN Zhong-hao;MA Xin-bo;LIU Hong-wu;WU Chao-bao;WU Jin-quan(College of Water Resource Science and Engineering,Taiyuan University of Technology,Taiyuan 030024,China;Shanxi Province Central Irrigation Experimental station,Lüliang 032107,Shanxi Province,China)

机构地区：[1]太原理工大学水利科学与工程学院,太原030024 [2]山西省中心灌溉试验站,山西吕梁032107

出　　处：《节水灌溉》2024年第10期94-101,共8页Water Saving Irrigation

基　　金：山西省研究生科研创新项目(2023KY231);山西省基础研究计划青年科学研究项目(202203021212267);汾河灌区高校节水灌溉水肥一体化技术试验(RH2300002638)。

摘　　要：为利用修正后的双作物系数法来准确估算不同生育期计划湿润层深度下春玉米蒸散量(ET_(c))。根据不同生育期设定不同计划湿润层深度(T1、T2、T3),试验灌水下限设定为65%田间持水量(θ_(FC)),灌水上限为100%θ_(FC)。利用实测叶面积指数(LAI)修正双作物系数模型中的基础作物系数(K_(cb))和土壤蒸发系数(K_(e)),并结合山西省中心灌溉试验站的气象数据等估算了春玉米ETc,同时用实测数据对估算值进行适应性评价。2023年T1、T2、T3春玉米全生育期ETc分别为438.46 mm、397.68 mm和419.86 mm;估算的全生育期ET_(c)为454.08 mm、431.87 mm和452.47 mm。改正后的双作物系数法的决定系数(R^(2))、均方根误差(RMSE)、模型效率系数(E_(ns))、平均绝对误差(AAE),T1为0.82、0.67 mm/d、0.84和0.57 mm/d,T2为0.81、0.79 mm/d、0.78和0.55 mm/d,T3为0.75、0.90 mm/d、0.71和0.60 mm/d。灌水较多的T1和T2的R2和E_(ns)均高于T3,RMSE和AAE小于T3,T1和T2的参数相差不大,说明灌水量较少时会影响模型的估算精度,T1处理的灌水量最大,蒸散量最大,模型的拟合程度最高,T2和T3次之。因此,修正后的双作物系数法可用于不同湿润层深度下春玉米蒸散量的预测,该模型更适用于水分充足条件下春玉米蒸散量估算。The purpose of this study is to accurately estimate the evapotranspiration(ET_(c))of spring maize using dual crop coefficient method under different planned soil wetting layer depths.In this study,there were three levels of planned soil wetting layer depths(T1,T2,T3)in different growth stages.The lower limit of irrigation was set at 65%of field capacity(θ_(FC)),with a maximum irrigation limit of 100%θ_(FC).The measured leaf area index(LAI)was used to adjust the basal crop coefficient(K_(cb))and soil evaporation coefficient(K_(e))in the dual crop coefficient model.Moreover,the adaptability of the estimated values was evaluated using the measured data from large-scale weighing lysimeter.In the whole growth period,the modified dual crop coefficient model improved the accuracy of the estimated ETc,with the estimated ET_(c) being 454.08 mm,431.87 mm and 452.47 mm in T1,T2,T3 respectively,and the measured ETc being 438.46 mm,397.68 mm and 419.86 mm in T1,T2,T3,respectively.The R^(2),RMSE,E_(ns),and AAE of the dual crop coefficient method were 0.82,0.67 mm/d,0.84,0.57 mm/d for T1,0.81,0.79 mm/d,0.78,0.55 mm/d for T2,and 0.75,0.90 mm/d,0.71,0.60 mm/d for T3,respectively.The R^(2)and E_(ns)of T1 and T2 with more irrigation amount were higher than T3,and the RMSE and AAE were lower than T3.The differences in parameters between T1 and T2 were not significant.It indicated that the less irrigation amount will affect the estimation accuracy of the model.The irrigation amount and ETc of T1 were the largest,and the fitting degree of the model was the highest,followed by T2 and T3.Therefore,the modified dual crop coefficient model is reliable to estimate the ET_(c) of spring maize at different soil wetted depths.And the model is more suitable for estimating spring maize evapotranspiration under sufficient water conditions.

关 键 词：蒸散量估算 双作物系数法 蒸渗仪 土壤湿润层 春玉米 

分 类 号：S274.1[农业科学—农业水土工程]