| 引用本文: | 苗正伟,徐利岗,张 薇.京津冀地区参考作物蒸散量变化特征与成因分析[J].灌溉排水学报,2018,37(5):39-50. |
| MIAO Zhengwei,XU Ligang,ZHANG Wei.京津冀地区参考作物蒸散量变化特征与成因分析[J].灌溉排水学报,2018,37(5):39-50. |
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| 摘要: |
| 【目的】分析京津冀地区参考作物蒸散量（ET0）的变化特征及其影响因子。【方法】基于京津冀地区24个气象站 1961―2016年的逐日气象资料，采用Penman-Monteith公式计算了各站及区域ET0，采用气候倾向率、Mann-Kendall突变检测、Morlet小波分析、敏感性系数等方法对京津冀地区ET0的时空变化及其影响因素进行了分析。【结果】1961―2016年，京津冀地区全年和四季ET0均呈下降趋势，在空间上表现出随海拔增加而减小的基本特征；全年和秋季ET0分别在1975年和2009年发生了由减少到显著减少的突变；全年、春季、夏季、秋季、冬季ET0的典型周期分别为7、11、16、19、19 a；ET0在年、春季、秋季、冬季均对相对湿度最敏感，在夏季则对最高气温最敏感。【结论】在全年、春季、秋季、冬季，风速的显著下降是ET0减少的主要原因，而在夏季，ET0减少的主要原因是日照时间的显著减少；ET0的在时间上变化不显著，是气候因子综合贡献率与ET0相对变化率差别较大的重要原因。 |
| 关键词: 京津冀； Penman-Monteith公式； 敏感性； 参考作物蒸散量 |
| DOI：10.13522/j.cnki.ggps.2017.0639 |
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| Spatiotemporal Variation of the Reference Crop Evapotranspiration and the Factors Affecting It in Beijing-Tianjin-Hebei Region |
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MIAO Zhengwei, XU Ligang , ZHANG Wei
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Department of Hydraulic Engineering, Hebei University of Water Resources and Electric Engineering, Cangzhou 061001, China;The Scientific Research Institute of the Water Conservancy of Ningxia, Yinchuan 750021, China
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| Abstract: |
| 【Objective】 The aim of this paper is to analyse the spatiotemporal variation of the reference crop evapotranspiration (ET0) and the factors affecting it in Beijing-Tianjin-Hebei Region. 【Method】 We first calculated ET0 using the Penman-Monteith formula and the daily measured data at 24 meteorological stations from 1961 to 2016 across the region, and then analysed its spatiotemporal variation using the climate tendency rate, Mann-Kendall test and the Morlet wavelet analysis. The factors affecting the variation of ET0 were analysed using the sensitivity coefficients of ET0 to other climatic factors. 【Result】 The annual and seasonal ET0 across the regions has been in decline over the past 55 years; spatially, ET0 decreases with increasing altitude. There were abrupt changes in annual and autumn ET0 in 1975 and 2009. The annual and seasonal ET0 had periodic cycles of 7, 11, 16, 19 and 19 years. Sensitivity analysis revealed that annual ET0 was most sensitive to relative humidity. Seasonally, relative humidity was most sensitive to ET0 in spring, autumn and winter, whilst the highest temperature was most sensitive in summer for ET0. 【Conclusion】 In spring, autumn, winter, as well as annual average, the temporal changes in ET0 are primarily caused by decrease in wind speed, while in summer it is due to the decrease in sunshine duration. |
| Key words: Beijing-Tianjin-Hebei; Penman-Monteith equation; sensitivity analysis; reference crop evapotranspiration |
