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中国农学通报

中国农学通报 ›› 2005, Vol. 21 ›› Issue (12): 105-105.

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参考作物蒸发蒸腾量计算简化方法

吴宏霞, ,彭世彰,,徐俊增,   

  • 出版日期:2005-12-05 发布日期:2005-12-05

Simplified Method of Reference Evapotranspiration Calculation

Wu Hongxia,, Peng Shizhang,, Xu Junzeng,   

  • Online:2005-12-05 Published:2005-12-05

摘要： 基于国家“863”节水农业重大专项子课题示范现场的气象资料，对参考作物蒸发蒸腾量及其影响因素进行了相关性分析。选取净辐射和空气饱和差建立了参考作物蒸发蒸腾量的简化计算公式，并引入风速函数进行修正。研究结果表明：参考作物蒸发蒸腾量与净辐射相关系数最大，然后依次是空气饱和差、日照时数和温度；且与净辐射和空气饱和差呈直线关系，与日照时数和温度呈指数关系，而与相对湿度呈负相关关系；考虑风速修正后的简化公式与标准方法（FAO56 Penman-Monteith）的计算结果有较高的一致性。

Abstract: Based on the meteorological data derived from the national “863” special project, relationship between reference evapotranspiration(ET0) and the effected factors was analyzed. Net radiation (Rn) and vapor pressure deficit (VPD) were selected as influence factors to construct the regressive formula to calculate ET0. Then the influence of wind was considered. Results show that: Rn is the greatest influence factor, following by VPD, sunshine hour (N) and temperature (T). Liner relationship is found between ET0 and Rn or VPD, exponential relationship between ET0 and N or T, and negative relative relationship to relative humidity (Rh). Simplified fomular modified by wind can get great coherence with Penman-Monteith method commended by FAO.