参考作物蒸散量计算方法在西宁的适用性分析

An Analysis of Applicability of Reference Crop Evapotranspiration Calculation Methods in Xining

利用青海西宁气象站点1970-2016年的逐日气象资料,以Penman-Monteith估算结果作为计算参考作物蒸散量(ET0)的标准,讨论Hargreaves-Samani法、Mc Cloud法与1948 Penman法3种方法在青海省西宁地区的适用性。结果表明:1948 Penman法和Hargreaves-Samani法优于Mc Cloud法;Mc Cloud估算结果显著偏小;Hargreaves-Samani法,在ET0较小时估算值与Penman-Monteith方法计算值相当,在ET0较大时,估算结果显著高于标准值;1948 Penman法与Penman-Monteith法相关系数较高,一致性最好,可以对1948 Penman法的估算值乘以一个常数就能够近似代替PenmanMonteith公式的估算值,提高估算精度。

Based on the daily meteorological data of Xining meteorological stations from 1970 to 2016,by using Hargreaves-Samani method,Mc Cloud method and 1948 penman method with the Penman-Monteith method as the standard of calculating reference crop evapotranspiration（ ET0）,this paper is an attempt to estimate applicability of the three methods in Xining. The results show that 1948 penman method and the Hargreaves-Samani method is superior to Mc Cloud; the result of Mc Cloud estimating is significantly smaller; Hargreaves-Samani method has the same calculating values with the Penman-Monteith in small ET0,and estimates significantly higher than the standard value in high ET0;the correlation coefficient between 1948 penman method and Penman-Monteith method is high,and its has the best consistency,the estimate value of Penman-Monteith equation can replace 1948 penman method by multipling a constant approximately and improve the accuracy of estimation.