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。日变化过程呈现"U"型,最低点出现在中午(低于50 s/m),最高点出现在早晨8∶00和傍晚18∶00(高于100 s/m)。
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 ETo 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 ε/m） and maximum point appears at 8：00 and 18：00（higher than 100 s/m）.
出处
《干旱地区农业研究》
CSCD
北大核心
2009年第5期107-111,共5页
Agricultural Research in the Arid Areas
基金
教育部高校青年教师奖
关键词
参考作物蒸发蒸腾量
冠层阻力
苜蓿
reference crop evapotranspiration
canopy resistance
alfalfa
