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西辽河流域在区域和国家粮食安全中的地位重要,随着社会经济的发展,用水量增加导致水资源紧缺,参考作物蒸散量可为该区作物灌溉和区域灌溉需水量提供定量依据,本文采用Penman-Monteith模型计算了西辽河流域11个气象台站1952年～2007年来的月和年参考作物蒸散量,采用Kendall秩次相关法,对变化趋势进行了相关分析。研究结果表明:①西辽河流域多年平均蒸散量介于861～1330mm之间,空间分布呈现中部高,四周低的态势,月最高气温是西辽河流域年内参考作物蒸散量变化的主导因素;②近55年来,西辽河流域年际蒸散量变化整体呈增加趋势,但增加不显著,季节分布情况而言,多数站点春季和夏季参考作物蒸散量呈增加趋势,秋季和冬季呈减少趋势;③夏季蒸散量的变化是西辽河流域年蒸散量变化的主导因素。
With the development of society and economy, the increase of water consumption leads to the shortage of water resources. The reference of crop evapotranspiration can provide quantitative basis for crop irrigation and regional irrigation water demand in this area. In this paper, Penman-Monteith model was used to calculate the monthly and annual reference crop evapotranspiration of 11 meteorological stations in the Xiliaohe River Basin from 1952 to 2007, and the correlation analysis was made by using the Kendall rank correlation method. The results show that: ①The annual evapotranspiration in the Xiliaohe River Basin ranges from 861 to 1330 mm, the spatial distribution is high in the middle part and low in the four weeks. The monthly maximum air temperature is the dominant factor of the reference crop evapotranspiration in the Xiliaohe River Basin in recent years. In the past 55 years, the annual variation of evapotranspiration in the Xiliaohe River Basin showed an overall trend of increase, but with no significant increase and seasonal distribution, the spring and summer reference evapotranspiration at most sites showed an increasing trend, while the autumn and winter declines; ③ summer evapotranspiration The change of quantity is the dominant factor of the annual evapotranspiration in the Xiliaohe River Basin.