邯郸市永年区不同PM修正模型麦田蒸散模拟对比

为探究不同PM修正模型在邯郸市永年区麦田的结构适应性、模拟准确性,以田间水量平衡计算结果为参照,分别选取了3种不同结构形式的PM修正模型命名为PM-1、PM-2和PM-3模型,模拟了永年区冬小麦关键生长期(4—5月)内的农田蒸散,并对比评价其模拟效果。结果表明:模拟精度方面,PM-1模型模拟的决定性系数和整体评价指标的平均值最高,分别为0.773和3.105,而PM-3模型模拟的两个指标最低,分别为0.701和-2.904；PM-1模型时间分布均衡度最高,PM-2模型最低；3种修正模型各具优点和局限性,对永年区蒸散模拟PM-1模型更具适应性。

Simulation comparison of wheat field evapotranspiration with different PM models in Yongnian District of Handan City

In order to illustrate the structural adaptability, precision and accuracy of different PM correction models in wheat fields of Yongnian District of Handan City, the field evapotranspiration during key growth stages (from April to May) of winter wheat was simulated respectively through PM-1, PM-2 and PM-3, and simulation results were compared with the water balance results. The results show that the simulated evapotranspiration precision of PM-1 is the highest, of which the corresponding R 2 and GPI values are 0.773 and 3.105 respectively; the precision of PM-3 is the lowest, of which the corresponding R 2 and GPI are 0.701 and -2.904 respectively. The temporal distribution equilibrium of PM-1 simulated evapotranspiration is the best and that of PM-2 is the worst. These PM correction models have their own advantages and limitations, and PM-1 is more suitable for the evapotranspiration simulation of Yongnian District. The results can supply reference to the disclosure of wheat-fields evapotranspiration law in key growth stages and provide basis for the inversion and revision of remote sensing evapotranspiration in large scale.