ngstrm-Prescott系数选取对参考作物蒸散量的影响—以黄河中游站点为例

中国农业气象

ngstrm-Prescott系数选取对参考作物蒸散量的影响—以黄河中游站点为例

刘晓英;李玉中;

中国农业科学院农业环境与可持续发展研究所,中国农业科学院农业环境与可持续发展研究所北京100081,北京100081

出版日期:2007-02-10 发布日期:2007-02-10
基金资助:
社会公益项目(2004DIB3J095)

Effect of Various ngstrm-Prescott Coefficients on Reference Crop Evapotranspiration—A Case Study for the Middle Reach of Yellow River

LIU Xiao-ying, LI Yu-zhong(Institute of Environment and Sustainable Development in Agriculture,Chinese Academy of Agricultural Sciences, Beijing 100081, China)

Online:2007-02-10 Published:2007-02-10

摘要/Abstract

摘要： 利用黄河中游三个站点近50a的气象资料,研究了ngstrm-Prescott系数不同取值对参考作物蒸散量的影响。结果显示,当ngstrm-Prescott系数as和bs分别相差56%和93%时,引起的ET0差异月值在0.6%~26.2%,年值在173.1~197.4mm(18.2%~21.9%)。ngstrm-Prescott系数不同取值对ET0的影响程度随地点而变化,即随海拔和日照时数的增加,对ET0的影响程度相应增大。因此在高海拔和高辐射地区,应对ngstrm-Prescott系数进行校正。尽管FAO56PM推荐的ngstrm-Prescott系数在世界各地广泛应用,但依据本文结果尚不能确定其在中国能否直接使用。随着辐射数据的不断积累,有必要对这些系数进一步研究、验证和校正。

关键词: ngstrm-Prescott, 参考作物蒸散量, Penman-Monteith

Abstract: Effect of different ngstrm-Prescott coefficients on the reference crop evapotranspiration (ET0) was studied,using data series in last 50 years from 3 meteorological stations in the middle reach of Yellow River. The results showed that 56% and 93% variation of the ngstrm-Prescott coefficients(as& bs )in this region resulted in 0.6% -26.2% monthly variation, and 18.2-31.9%(173.1-197.4mm)annual variation for ET0. The effect of ngstrm-Prescott coefficients on ET0 was spatial dependent. It increased with the increasing of altitude and sunshine hours. It suggested that ngstrm-Prescott coefficients should be calibrated in regions with high altitude and intensive radiation. Though the ngstrm-Prescott coefficients were recommended by the FAO 56 PM to apply to the world wide, they could not been applied to in China directly according to this result. It seemed necessary to be validated and calibrated further to these coefficients.

Key words: ngstrm-Prescott, ngstrm-Prescott, Reference crop evapotranspiration, Penman-Monteith

刘晓英;李玉中;. ngstrm-Prescott系数选取对参考作物蒸散量的影响—以黄河中游站点为例[J]. 中国农业气象.

LIU Xiao-ying, LI Yu-zhong(Institute of Environment and Sustainable Development in Agriculture,Chinese Academy of Agricultural Sciences, Beijing 100081, China). Effect of Various ngstrm-Prescott Coefficients on Reference Crop Evapotranspiration—A Case Study for the Middle Reach of Yellow River[J]. Chinese Journal of Agrometeorology.

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