强小嫚,蔡焕杰,周新国,王健.参考条件下苜蓿冠层阻力变化规律试验研究[J].干旱地区农业研究,2009,27(5):107~111
参考条件下苜蓿冠层阻力变化规律试验研究
Experimental study on alfalfa’s canopy resistance and its variation under reference condition
  
DOI：10.7606/j.issn.1000-7601.2009.05.20
中文关键词:  参考作物蒸发蒸腾量  冠层阻力  苜蓿
英文关键词:reference crop evapotranspiration  canopy resistance  alfalfa
基金项目:教育部高校青年教师奖
作者单位
强小嫚 Key Laboratory for Agricultural Soil and Water Engineering in Arid Area of Ministry of Education Northwest A＆F University， Yangling， Shaanxi 712100， China；Farmland Irrigation Research Institute CAAS， Xinxiang， He’nan 453003， China 
蔡焕杰 Key Laboratory for Agricultural Soil and Water Engineering in Arid Area of Ministry of Education Northwest A＆F University， Yangling， Shaanxi 712100， China 
周新国 ；Farmland Irrigation Research Institute CAAS， Xinxiang， He’nan 453003， China 
王健 Key Laboratory for Agricultural Soil and Water Engineering in Arid Area of Ministry of Education Northwest A＆F University， Yangling， Shaanxi 712100， China 
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中文摘要:
      冠层阻力是参考作物蒸发蒸腾量计算公式中的一个重要参数,对准确计算参考作物蒸发蒸腾量(ET0)及诊断作物缺水等都有非常重要的意义。本研究以FAO(1994)推荐的ET0公式(Penman-Monteith公式)假定条件为出发点,结合ET0值的实测资料,对经过修剪的苜蓿冠层阻力进行试验分析。结果表明:在参考条件下,冠层阻力随着作物生育期的延长,呈递增趋势。日变化过程呈“U”型,最低点出现在中午(低于50 s·m-1),最高点出现在早晨8∶00和傍晚18∶00(高于100 s·m-1)。
英文摘要:
      Canopy resistance, an important parameter for calculation formula of reference crop evapotranspiration, has momentous significance for accurate calculation of reference crop evapotranspiration and diagnosing Crop-Water-Stress.With the presumed conditions of ET0 equation by FAO as a starting point, this article studies alfalfa's canopy resistance with measured data.The results show that the variation of canopy resistance increases with growth proceeding.The diurnal variation curve of canopy resistance takes the shape of “U”, whose minimum point appears at noon (lower than 50 s·m-1) and maximum point appears at 8∶00 and 18∶00 (higher than 100 s·m-1) .
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