河南省参考作物蒸散量季节变化及其成因分析

Seasonal variation and climatic factors of reference crop evapotranspiration in Henan province

利用河南省99个气象站1965—2018年逐日气象资料,采用Penman-Monteith公式计算逐日参考作物蒸散量,利用气候倾向率、相关分析和偏相关分析等方法分析河南省参考作物蒸散量的季节变化特征,并对其主要影响因子进行探讨。结果表明,季参考作物蒸散量呈减少趋势,各季节参考作物蒸散量的气候倾向率绝对值由大到小依次为夏季、秋季、冬季、春季。春季参考作物蒸散量为北高南低的纬向型分布,夏、秋2季均为东高西低的经向型分布。风速的减小和日照时数的缩短是河南省参考作物蒸散量减少的主要原因。

Based on the daily data of 99 meteorological stations in Henan province from 1965 to 2018,the daily reference crop evapotranspiration was calculated by using of FAO Penman-Monteith equation.The spatiotemporal variation of reference crop evapotranspiration were analyzed by using trend analysis,and its climatic factors were analyzed by correlation analysis and partial correlation analysis.The results showed that the seasonal reference crop evapotranspiration was significant decreasing,and the decreased order of absolute value of climate tendency rate was summer,autumn,winter,spring.The distribution of reference crop evapotranspiration in spring was latitudinal,while that in summer and autumn were meridional.The decrease of wind speed and sunshine hours relative humidity were the main reason for the decrease of reference crop evapotranspiration in Henan province.