三峡工程建成蓄水对库区参考作物蒸发蒸腾量的影响研究

Research on the Influence of Three Gorges Project Construction on Reference Crop Evapotranspiration ET in Reservoir Areas

采用M-K检验法对三峡库区参考作物蒸发蒸腾量ET0进行年际变化分析,借助通径分析法研究三峡工程首次135 m蓄水前、后不同气象因子对库区参考作物蒸发蒸腾量的影响。结果表明:在1961-2014年间,三峡库区年平均ET0总体呈现下降趋势,其中1961-2002年间表现为下降趋势,2003-2014年间表现为上升趋势。三峡工程首次135 m蓄水前,库区内影响年平均ET0的主要气象因子不完全相同,但2003年后,库区年平均ET0主要受年平均气温影响。

In this paper,the annual variation of reference crop evapotranspiration ET0 in the Three Gorges Reservoir area is analyzed by means of M-K method,and the path analysis method is used to explore the evapotranspiration of reference crops in different reference factors before and after the first 135 m water storage of the Three Gorges Project.The results show that during the period from 1961 to 2014,the annual average ET0 in the Three Gorges reservoir area showed a downward trend,among them,the period from 1961 to 2002 was a decline trend,and the performance was a rise trend from 2003 to 2014.Before the first 135 m impoundment of the Three Gorges Project,the meteorological factors affecting the annual average reference crop evapotranspiration ET0 in the reservoir area were different.After 2003,the annual average ET0 in the reservoir area was mainly affected by the annual average temperature.