【摘要】 通过对基于Penman-Monteith公式的作物系数研究,为Penman-Monteith公式在关中地区的推广应用提供参考。采用联合国粮农组织(FAO)先后推荐的Penman修正式与Penman-Monteith公式,计算关中地区30个气象站1961~2001年的参照作物腾发量,确定关中地区冬小麦和夏玉米基于Penman-Monteith公式的作物系数,比较分析基于Penman修正式与基于Penman-Moneith公式的作物系数的差异。在关中地区,冬小麦基于Penman修正式与基于Penman-Moneith公式的作物系数有显著差异;而夏玉米的没有显著差异。在关中地区推广应用Pen-man-Monteith公式计算作物需水量时,目前正在使用的基于Penman修正式的冬小麦作物系数需要校正;而夏玉米作物系数无须校正。更多还原

【Abstract】 The crop coefficient on the Penman-Monteith method was calculated to provide a theory for the application of Penman-Monteith formula in the Guanzhong area.The Penman and Penman-Monteith methods recommended afterwards by the FAO of the UN were adopted to calculate respectively the reference crop evapotranspiration from 1961 to 2001 in Guanzhong so as to work out the crop coefficient on Penman-Monteith method.And the crop coefficients on Penman and on Penman-Monteith formula will be analyzed and compared.there were significant differences between on Penman and on Penman-Monteith formula for the crop coefficient of winter wheat;but no significant differences for summer maize in Guanzhong.The crop coefficient of winter wheat on the Penman method need be updated with the use of Penman-Monteith for the crop water demand;while summer maize need not do.更多还原