分别利用Hargreaves和PM公式计算西北干旱区ET_0的比较  

Comparison of estimating ET_0 in arid-area of Northwest China by Hargreaves equation and Penman-Monteith equation

作　　者：王新华[1] 郭美华[2] 徐中民[1] 

机构地区：[1]中国科学院寒区旱区环境与工程研究所冻土工程国家重点实验室,兰州730000 [2]兰州理工大学材料科学与工程学院,兰州730050

出　　处：《农业工程学报》2006年第10期21-25,共5页Transactions of the Chinese Society of Agricultural Engineering

基　　金：国家自然科学基金重点项目(40235053);国家自然科学青年基金项目(40201019);多地区和部门的气候变化影响和适应性评价项目(AS25)

摘　　要：该文根据甘肃张掖气象站1991～2000年的气象资料,利用Hargreaves公式和Penman-Monteith公式计算了参照作物需水量（ET0）.对比分析结果表明：Hargreaves公式计算的ET0H年值比Penman-Monteith公式的计算ET0PM偏低,而在年内6、7、8月份,ET0H＞ET0PM,9月份两种方法计算结果几乎相等,其他月份ET0H＜ET0PM.造成这种结果的原因是风速和降雨的影响.根据两种方法的计算结果,提出了适合西北干旱区ET0的计算公式.According to the climate data from 1991 to 2000 at Zhangye weather station, using Hargreaves equation and Penman-Monteith equations, the reference crop evapotranspiration （ET0） was calculated. Results show that the annual value of ET0 calculated by Hargreaves equation is lower than that calculated by Penman-Monteith equation. ET0H will be greater than ET0PM in June, July and August. The calculating value will almost be equal in September, and ET0H will be lower than ET0PM in other months. The difference is caused by precipitation and wind speed. Based on the estimating ET0 by the two equations, the ET0 calculating equation applied in arid-area of Northwest China is put forward.

关 键 词：Hargreaves公式 PENMAN-MONTEITH公式 参照作物需水量 

分 类 号：S152.7[农业科学—土壤学]