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《Arid Zone Research》 2010-01
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Climate-Environmental Evolution in Desert-oasis Ecotone in the Hexi Corridor

GAO Zhen-rong~(1,2),LIU Xiao-yun~2,YANG Qing-hua~2,MA Ting-de~2 (1.Key Laboratory of Arid Climate Change and Disaster Reduction of Gansu Province,Key Laboratory of Arid Climate Change and Disaster Reduction of CMA,Institute of Arid Meteorology,China Meteorology Administration,Lanzhou 730020,China; 2.Jiuquan Meteorological Bureau,Jiuquan 735000,Gansu Province,China)  
Based on the air temperature,precipitation and evaporation data observed by the Dunhuang,Jinta and Minqin meteorological stations in the Hexi Corridor,Gansu Province during the period from 1960 to 2007,in this paper the climate change characteristics in desert-oasis ecotones in the Hexi Corridor are researched using the anomaly time series and the multi-order autoregression series analysis.The results show that there were two stages of annual temperature change in desert-oasis ecotones in the Hexi Corridor in recent 48 years from 1960 to 2007,that is,the temperature was low during the period from 1967 to 1986,but it began to increase from 1987,in which the temperature increase rates in Minqin,Jinta and Dunhuang were 0.051℃/a,0.060 6℃/a and 0.063 8℃/a respectively, and the annual temperature is currently at its historical peak stage.The annual evaporation is significantly increased,thus the topsoil moisture content is decreased by 3.546%/10 a.Moreover,the change of groundwater level in desert-oasis ecotones in the Hexi Corridor is also analyzed based on the data of irrigation areas and pumped groundwater volumes in the corridor during the period of 1980-2007.The results reveal that human activities, such as the enlargement of the areas under cultivation and over-pumped groundwater,is one of the main causes resulting in environmental degeneration in the corridor under the background of climatic warming.
【Fund】: 干旱气象科学研究基金项目(IMA 2008-02)
【CateGory Index】: P467
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