为了研究气候变化条件下辽宁省参考作物腾发量(ET0)的变化特征,以辽宁省56个站点1954—2016年的气象数据为基础,采用FAO推荐的Penman-Monteith公式对该地区的ET0进行推算;并利用干旱指数综合分带法,将辽宁省分为半干旱地区和半湿润地区;并在半干旱和半湿润地区分别选择4 个气象站,对其ET0的时空变化特征进行分析.结果表明:全省多年平均ET0大致呈下降趋势;但该趋势不明显,倾向率仅为-0.000 1 mm·10 a;全省1954～2016年日均ET0的多年平均值为2.382 mm,日均ET0在(2.380±0.300) mm的范围内波动.8个站点中喀左站、朝阳站、康平站、桓仁站、沈阳站和鞍山站ET0呈极显著下降趋势,阜新站和大连站呈显著上升趋势.对ET0的年际变化影响较显著的气象因素是相对湿度、日照时数.%To study the daily reference evapotranspiration (ET0) variation characteristics under the condition of climate change in Liaoning province, the daily ET0were estimated using FAO Penman-Monteith equation based on the daily meteorological measurements of 56 meteorological stations in Liaoning from 1954 to 2016.Using the meth-od of comprehensive drought index zoning, Liaoning province can be divided into semi-humid areas and semi-arid areas.Four weather stations were chosen to analyse their spatial and temporal variations of ET0in semi-humid areas and semi-arid areas.Results showed that ET0were roughly in a decreasing trend in Liaoning province, but the trend is not obvious and the tendency rate is only -0.001 mm·10 a;The average daily ET0was 2.382 mm from 1954 to 2016,and it ranged in (2.380±0.300) mm.Significant decreasing trends were observed in Kazuo sta-tion, Chaoyang station, Kangping station, Huanren station, Shenyang station and Anshan station, and significant decreasing trends were observed in Fuxin station and Dalian station.The significant meteorological factor that im-pacted on reference evapotranspiration were relative humidity and sunshine radiation.
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