豫北地区参考作物需水量计算方法比较与评价

Comparison and Evaluation of Calculation Methods of Reference Crop Water Requirement in the North Area of Henan Province

[目的]比较豫北地区参考作物需水量的计算方法。[方法]利用新乡站点连续47年气象资料,采用Hargreaves公式和Priestley Taylor公式计算参考作物需水量,以Penman-Monteith公式计算结果作为对照,用统计学方法对Hargreaves公式和Priestley Taylor公式计算结果进行对比评价。[结果]Hargreaves公式和Priestley Taylor公式计算结果均与Penman-Monteith公式结算结果呈线性关系,相关系数分别为0.946 1和0.922 2,拟合度分别为98%和97%。[结论]在豫北地区可以用Hargreaves公式和Priestley Taylor公式代替Penman-Monteith公式计算参考作物需水量,并且Hargreaves公式比Priestley Taylor公式计算更精准。

[Objective] The research aimed to compare the calculation methods of the reference crop water requirement in the north area of Henan Province. [ Method] Using the meteorological data in Xinxiang station for 47 consecutive years, the Hargreaves formula and the Priestley Taylor formula were used to calculate the reference crop water requirement,with the result of Penman-Monteith formula as control, the results of Hargreaves formula and Priestley Taylor formula were compared by statistical method. [ Result] Both the Hargreaves formula and the Priestley Tay- lor formula had a linear relationship with the Penman-Monteith formula,and the correlation coefficients were 0. 946 1 and 0. 922 2 ,respectively, and the fitting degrees were 98% and 97% ,respectively. [ Conclusion] In the northern area of Henan Province ,the reference crop water require- ment can be calculated using the Hargreaves formula and the Priestley Taylor formula instead of the Penman-Monteith formula, and the Hargreaves formula is more accurate than the Priestley Taylor formula.