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冬小麦生育期潜水蒸发估算模型研究

Research on Estimation Model of Phreatic Water Evaporation in Winter Wheat Growth Period

  • 摘要: 潜水是作物生长可利用的水源之一。采用五道沟实验站1991年10月-2020年5月潜水蒸发和水文气象长系列实测资料,分析了冬小麦生育期不同埋深潜水(0~5 m)蒸发与水面蒸发、地表温度、空气绝对湿度和气温4个因素的变化趋势,计算了冬小麦各生育期地下水位不同埋深下潜水蒸发量分别与4个气象因子的比值(潜水蒸发系数),从而构建了潜水蒸发系数与埋深的函数关系。结果表明:基于4个气象因子的潜水蒸发系数与埋深的拟合关系,均表现为:出苗-分蘖期指数函数拟合效果最好,其他生育期二项式函数拟合效果最好,R2均达到0.89以上,拟合精度较高,可用于淮北地区黄潮土冬小麦生育期间潜水蒸发量的估算。

     

    Abstract: Phreatic water is one of the available water sources for crop growth. In this paper,the long-term observation data of phreatic water evaporation and hydrometeorology at Wudaogou Experiment Station from October 1991 to May 2020 are used,the variation trend of phreatic water evaporation and water surface evaporation,surface temperature,air absolute humidity and air temperature at different buried depths(0~5 m)in winter wheat growth period are analyzed,the ratios of phreatic water evaporation to four meteorological factors at different depths of groundwater table in different growth stages of winter wheat are calculated(evaporation coefficient of phreatic water),the functional relationship between evaporation coefficient of phreatic water and buried depth is constructed. The results show that based on four meteorological factors,the fitting relationship between phreatic water evaporation coefficient and buried depth is analyzed,the results show that all of them are positive:the exponential function of emergence tillering stage is the best,and binomial function of other growth stages is the best,the R2 is above 0.89,the fitting accuracy is high,it can be used to estimate the phreatic water evaporation of Winter Wheat in yellow fluvo aquic soil in Huaibei Area.

     

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