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基于河西内陆河流域17个气象站1961—2008年逐日气象数据,采用Penman-Monteith公式计算了逐日参考作物蒸散量(ET0),利用GIS空间分析功能,采用反距离空间插值方法研究了年和季节ET0的时空特征.结果表明:1961—2008年,河西内陆河流域年均ET0(700～1330mm)由东南向西北逐渐增加;黑河流域和疏勒河流域年均ET0高值区呈显著下降趋势(P<0.05),其气候倾向率在-53～-10mm·(10a)-1,石羊河流域年均ET0低值区呈微弱增加趋势;研究区各流域ET0年际波动较大,并以临泽为较大的波动中心,分别向西北和东南两个方向降低.春季和夏季是河西内陆河流域ET0的集中季节,且疏勒河流域一直是四季ET0值最高的地区.研究区ET0气候倾向率依次为夏季>春季>秋季>冬季.影响河西内陆河流域ET0变化的主要气候因子是风速和最高温度,其中风速是引起疏勒河和黑河流域ET0呈现减少趋势的主导因子,最高温度和日照时数是引起石羊河流域ET0呈现增加趋势的主导因子.
Based on daily meteorological data of 17 meteorological stations in the Hexi Inland River Basin from 1961 to 2008, the daily reference evapotranspiration (ET0) was calculated by the Penman-Monteith formula. Using the spatial analysis function of GIS, the inverse interval spatial interpolation method was used to study the annual The results showed that the average annual ET0 (700 ~ 1330mm) of inland river basins in Hexi area increased gradually from southeast to northwest from 1961 to 2008, and the annual mean ET0 of Heihe River and Shulehe River basins dropped significantly (P0.05). The trend of climate tended to be -53 ~ -10mm · (10a) -1. The annual average ET0 in Shiyang River basin tended to increase slightly. In the study area, And takes Linze as the larger center of fluctuation and decreases in both northwest and southeast respectively.The spring and summer are the concentration season of ET0 in the Hexi Inland River Basin and the Shulehe River Basin has been the area with the highest ET0 value in all seasons The main climatic factors influencing the ET0 change in the Hexi Inland River Basin are the wind speed and the maximum temperature, of which the wind speed is the dominant factor that causes the decrease of ET0 in the Shulehe and Heihe River basins, The highest temperature and According to the number of hours the Shiyang River Basin is causing rising trend of ET0 dominant factor.