北疆滴灌春小麦参考作物蒸发蒸腾量与气象因子的关系

The Relationship Between Reference Crop Evapotranspiration and Meteorological Factors of Spring Wheat Under Drip Irrigation Systems in Northern Xinjiang

根据2011年气象资料,应用Penman-Monteith公式计算滴灌春小麦生育期内逐日ET0值,采用相关分析法研究了ET0与气象因子之间的关系。结果表明:滴灌春小麦生育期内ET0的变化规律为先增大后减小,到抽穗期达到最大。在滴灌春小麦生育期内,缺乏气象数据资料的情况下,可以利用日平均气温和净辐射估算ET0,日平均湿度及日平均风速与ET0之间基本不存在线性关系,不能用日平均湿度及日平均风速估算ET0;各气象因子的累积量与ET0累积量相关系数均达到极显著线性相关水平,可以用各气象因子累积量计算ET0的累积值。

Based on the meteorological data in 2011,we use Penman-Monteith formula to calculate daily ET0 values of the spring whea under drip irrigation systems during the growth period,and then use correlation analysis method to study the relationship beiween ET0 and meteorological factors. The results show that ETo values during the spring wheat growth period increase first and then deercase, and reach the maximum at the heading stage. In the case of lack of meteorological data,we can take advantage of the daily awerage temperature and net radiation to estimates the ET0 of spring wheat during the growth period. The average daily humidity arid average daily wind speed don＇t have linear relationship with ETo and thus we can not use them to estimate ET0. The cumulative amount of meteorological factors have highly significant linear correlation with ETo cumulative amount, which could be used to calculate ET0 cumulative value.