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为计算气象资料匮乏地区的参考作物需水量,以新疆额敏灌区为例,分别采用Penman-Monteith方法和Blaney-Criddle方程计算参考作物需水量旬变化过程。结果表明,两种方法计算参考作物需水量均呈抛物线变化规律,5月前变化趋势一致,5月后变化过程差异较大。以Penman-Monteith方法计算结果为标准,采用回归分析方法修订了Blaney-Criddle方程,应用表明修订方程可较好地模拟灌区参考作物需水量变化过程。
In order to calculate the reference crop water demand in meteorological data-deprived areas, taking Emin Irrigation District in Xinjiang as an example, Penman-Monteith method and Blaney-Criddle equation were used to calculate the change of reference crop water requirement. The results showed that both methods had a parabolic curve for the reference crop water requirement, the trend of change was the same before May, and the difference was significant after May. Based on the Penman-Monteith method, the Blaney-Criddle equation was revised by regression analysis. The application shows that the revised equation can simulate the process of reference crop water demand better.