干旱区地理2024，Vol.47Issue(2)：192-202,11.DOI:10.12118/j.issn.1000-6060.2023.108
河西走廊潜在蒸散发时空格局变化与气象因素的关系
Relationship between changes in spatial and temporal patterns of potential evapotranspiration and meteorological factors in the Hexi Corridor
摘要
Abstract
Several factors affect the evapotranspiration process.Potential evapotranspiration(ET0)interacts with meteorological variables in a complex manner.Therefore,there is an urgent need to determine the response mech-anism of ET0 changes to meteorological variables.Based on meteorological data from 21 meteorological stations in the Hexi Corridor,Gansu Province,China and its surrounding areas,qualitative and quantitative methods were adopted to reveal the spatiotemporal variation of ET0 and to clarify the sensitivity of ET0 to changes in various meteorological factors and contributions by taking two spatial scales of the Hexi Corridor as a whole and three subdistricts.The results showed the following:(1)ET0 in both the Hexi Corridor and the subdistrict showed a sig-nificant fluctuating upward trend(Z>1.98),with a linear change rate of 2.94 mm·a-1,and the most obvious change was observed in the Heihe subdistrict.(2)ET0 increased from the southeast to northwest.It was smaller in the Shi-yang River subdistrict(1003.78 mm)and Heihe subdistrict(1031.30 mm)in the central and eastern parts of the Hexi Corridor,and larger in the Shule River subdistrict(1171.89 mm)in the western part of the Hexi Corridor.(3)The sensitivity of ET0 to changes in meteorological factors in the Hexi Corridor was ranked as relative humidi-ty(RH),daily maximum temperature(Tmax),sunshine duration(n),average wind speed(u),and daily rainfall(P),with ET0 being the most sensitive to decreases in RH and least sensitive to changes in P.(4)The increase in u was the main cause of the increase in ET0 in the Hexi Corridor,followed by a decrease in RH,increase in Tmax,and in-crease in n.(5)The ET0 in the subdistricts of the Shule River,Heihe River,and Shiyang River showed an increas-ing change,with the factors that contributed the most being Tmax(5.13%),u(8.22%),and Tmax(5.97%),respective-ly,and the factor that contributed the least being n.Variations in wind speed and air temperature were important factors that influenced the ET0 change in the Hexi Corridor.The research results are significant for the rational planning of irrigation water use and improvement of the utilization efficiency of agricultural water resources.关键词
潜在蒸散发/气象变量/响应/定量关系/河西走廊Key words
potential evapotranspiration/meteorological variables/response/quantitative relation/Hexi Corridor引用本文复制引用
马亚丽,牛最荣,孙栋元..河西走廊潜在蒸散发时空格局变化与气象因素的关系[J].干旱区地理,2024,47(2):192-202,11.基金项目
国家自然基金项目(42261003) （42261003）
寒旱区水文及水资源综合调控利用研究团队(GAU-XKTD-2022-08) （GAU-XKTD-2022-08）
甘肃农业大学水利水电工程学院科研团队建设专项资助项目(Gaucwky-04) （Gaucwky-04）
甘肃省重点研发计划项目(21YF5FA094,21YF5NA015) （21YF5FA094,21YF5NA015）
甘肃省水利厅水资源研究项目(GSAU-JSZX-2020-1205)资助 （GSAU-JSZX-2020-1205）
