*辽宁半干旱及半湿润地区ET0时空演变规律研究

为了研究气候变化条件下辽宁省ET₀的变化特征,本文以辽宁省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－0.0001mm.10a；全省1954-2016年日均ET₀的多年平均值为2.382mm,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。

Analysis of Reference Crop Evapotranspiration Spatio-Temporal Variation in semi-humid and semi-arid areas of Liaoning Province

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 in this paper. Using the method 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 ET₀ in semi-humid areas and semi-arid areas. Results showed that ET₀ were 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 ET₀ was 2.382 mm from 1954 to 2016 ,and it ranged in 2.380 ± 0.300 mm. Significant decreasing trends were observed in Kazuo station, 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 impacted on reference evapotranspiration were relative humidity and sunshine radiation.