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王可纯 , 蔡少杰, 卫 琦, 吕玉平, 廖林仙, 徐俊增.小时与日尺度PM公式的参照作物腾发量及其水稻单作物系数值差异水资源与水工程学报[J].,2019,30(1):247-253
小时与日尺度PM公式的参照作物腾发量及其水稻单作物系数值差异
Difference in reference crop evapotranspiration calculated by PM equation and the corresponding single crop coefficient of rice between hourly scale and daily scale
  
DOI:10.11705/j.issn.1672-643X.2019.01.37
中文关键词:  ASCE PM公式; FAO56 PM公式  不同时间尺度; 参考作物腾发量; 作物系数; 水稻
英文关键词:ASCE penman-monteith formula  FAO56 penman-monteith formula  different temporal scales  reference crop evapotranspiration  crop coefficients  rice
基金项目:江苏水利科技项目(2015089)
作者单位
王可纯 1, 蔡少杰1, 卫 琦1,2, 吕玉平1, 廖林仙1, 徐俊增1,2 (1.河海大学 南方地区高效灌排与农业水土环境教育部重点实验室 江苏 南京 210098
2.河海大学 水文水资源与水利工程科学国家重点实验室 江苏 南京 210098) 
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中文摘要:
      以昆山试验站2012-2013年自动气象站观测的小时气象资料为依据,分别采用ASCE PM公式和FAO56 PM公式计算小时ET0,在对比两种小时ET0计算结果基础上,通过逐小时累积求和得到日ET0值(分别记作ET0-dhA和ET0-dhF),进而与日尺度参照作物腾发量ET0(记作ET0-d)进行对比,在明确ET0-d,ET0-dhA和ET0-dhF差异的基础上,分析了基于不同ET0确定的水稻单作物系数差异(分别记为Kc-d、Kc-dhA与Kc-dhF)。结果表明:在水稻不同生育阶段内,小时ET0值大致呈抛物线型日变化,在中午时ET0达到最大,午夜则最低;2种PM公式计算得到的小时ET0值存在微小差异,差异范围在-0.02 ~0.5 mm/h内,白天ASCE PM公式计算值偏大,夜间则无明显规律。在日尺度上,ET0-d,ET0-dhA和ET0-dhF三者之间具有良好的线性关系,大小关系表现为:ET0-dhA >ET0-d>ET0-dhF。总体上,由实测日腾发量ETa求得的节水灌溉水稻单作物系数大于按照FAO推荐方法确定的作物系数值,且采用不同日ET0计算结果得到的水稻Kc值之间的大小关系为:Kc-dhAc-dc-dhF,但其差异较小,差异程度在5%以内。
英文摘要:
      Based on the hourly meteorological data collected by an automatic meteorological station in Kunshan Experimental Station during 2012-2013, hourly ET0 were calculated by ASCE PM and FAO 56 PM formulas equations separately to show the difference in hourly ET0 calculated by two different equations. Then the hourly ET0 were summed up to obtain the daily ET0 (termed as ET0-dhA and ET0-dhF)and compared to the daily ET0 calculated by PM equation at daily scale(ET0-d). Differences among ET0-d,ET0-dhA and ET0-dhF were discussed, as well as the difference among the single crop coefficient of rice based on daily ET0 determined by different procedures. The results showed that hourly ET0 varied in parabolic shape, with the maximum observed at noon and minimum at midnight. Hourly ET0 were slightly different between two methods, with the difference fell in range of -0.02~0.5 mm/h. Hourly ET0 by ASCE PM were found slightly higher than by FAO56 PM in daytime. Daily ET0 were highly correlated to each other, and ranked in sequence of ET0-dhA >ET0-d>ET0-dhF. Local calibrated single crop coefficient Kc of rice were higher than the value determined following the procedure by FAO, and ranked in sequence of Kc-dhAc-dc-dhF, with the difference among them less than 5%.
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