净辐射计算方法对参考作物蒸发蒸腾量计算值的影响
Evaluation of Radiation Calculating Methods in the Determination of Reference Crop Evapotranspiration by FAO-56PM
净辐射是参考作物蒸发蒸腾量计算所不可缺少的重要参数。由于净辐射计算涉及参数较多，采用不同辐射参数计算方法，会对净辐射计算结果乃至参考作物蒸发蒸腾量产生很大的影响。本文采用FAO-56PM公式、Kotsopoulos和Babajimopoulos(1997)、Hargreaves,G(1985)、Kreider, J(1979)、Allen et al.(1989)、Irmak et al.(2003b)、Allen(1996)、Harrington,G.J.和Stahl,K.M.(1985)计算公式，将不同方法所得净辐射和参考作物蒸发蒸腾量计算结果进行了比较。结果表明，不同辐射参数计算值对净辐射的计算结果影响不同， （大气边缘辐射）计算结果对 （境辐射）影响很大，Irmak et al.(2003b)、Allen(1996)、Harrington,G.J.和Stahl,K.M.(1985)方法所得净辐射与FAO-56PM结果较一致。进一步以不同方法所得净辐射代入FAO-56PM公式计算日参考作物蒸发蒸腾量。Irmak et al.(2003b)、Allen(1996)方法值与FAO-56PM公式计算值较一致。敏感性分析表明：净辐射值波动100%，ET0值波动在70%左右，净辐射值对ET0值的影响很大。在中亚热带低丘岗地区估算ET0时，可考虑用Irmak et al.(2003b)、Allen(1996)方法来估算净辐射。
alculating net radiation is necessary in the calculation of reference crop evapotranspiration. There are some parameters to be calculated in the calculation of net radiation. Based on the daily meteorological date of Yujiang Jiangxi Province, some parameters ( , , , ) and net radiation were calculated, according to formulas which are derived from FAO-56PM, Kotsopoulos and Babajimopoulos(1997), Hargreaves,G(1985), Kreider, J(1979),Allen et al.(1989),Irmak et al.(2003b), Allen(1996), Harrington,G.J. and Stahl,K.M.(1985).Calculating different parameters have different influence on calculation of net radiation. The calculation of extraterrestrial radiation has more influence than calculation of other parameters. The results of calculating net radiation which are derived from Measures of Irmak et al.(2003b), Allen(1996) are identical with calculating results of FAO-56PM. Calculating reference crop evapotranspiration on the results of different measures, the results tell us that measures of Irmak et al.(2003b), Allen(1996) can be used to calculate extraterrestrial radiation and clear-sky shortwave radiation in the subtropics low earthen mound hillock area. Sensitivity analyses show that one unit error in the result of net radiation will produce 0.7 unit error in the result of reference crop evapotranspiration.
徐俊增、丁加丽、罗玉峰、张莉 、彭世彰
农业科学研究农业基础科学
参考作物蒸发蒸腾量，FAO-56PM公式，净辐射，辐射参数。
net radiation reference crop evapotranspiration FAO-56PM parameters of radiation.
徐俊增,丁加丽,罗玉峰,张莉 ,彭世彰.净辐射计算方法对参考作物蒸发蒸腾量计算值的影响[EB/OL].(2007-05-30)[2025-06-20].http://www.paper.edu.cn/releasepaper/content/200705-520.点此复制
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