气象资料匮乏地区参考作物需水量的一种简化算法

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。

A Simplified Algorithm of Reference Crop Evapotranspiration in Meterological Data-deficiency Region

To obtain the reference crop evapotranspiration (ET0) for meterological data deficiency region, taking Ermin irrigation district in Xinjiang Autonomous Region for an example, Penman Monteith approach and Blaney Criddle equation are adopted to calculate the variation process of reference crop evapotranspiration in a period of ten days. The results show that the change process of ET0 with two methods is parabola type; the variation is similar before May, but quite different in the remaining months. Taking calculated results of Penman Monteith equation as standard, Blaney Criddle formula has been revised by regression analysis. Application demonstrates that the revised Blaney Criddle formula can simulate ET0 change of irrigation area commendably.