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《Journal of Mountain Research》 2005-03
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The Tendency of Climatic Change and It’s Effect on Ecosystem Environment in the Past40Years of Hanjiang Valley South ,Shaanxi

ZHAO Defang1,2, SUN Hu1, YAN Junping1, Li Junyi1, Li Junlin1 (1.The college of Tourism and Environment, Shannxi Normal University, Xi’an710062, China; 2.Xi’an University of Arts And Science, Xi’an710065, China)  
Based on the atmospheric temperature records from 1953 to 2000, precipitation records from 1961 to2000 and the flow of Hanjiang River records from1961 to 1999 of the hanjiang valley South of Shaanxi province.Analyzed the temperature, recipitation and surface flow records, the result indicates , the increasing progressively rate of temperature has been 0.025℃/10a in the past 40 years of the hanjiang valley South of Shaanxi province, it is not obvious to increase warmly, precipitation changes relatively big.Its precipitation change behaves in 3 aspects: Firstly, precipitation is diminution and the trend is marked; Secondly, precipita- tion is asymmetry in a year, which increase during the summer and reduces in the autumn.Thirdly, the number of times and precipitation of torrential rain amount change of more than 70% Monitoring station written down to stand show as trend of increasing. The change is negative influence on ecological environment of the hanjiang valley South of Shaanxi province, cause the hanjiang valley aridity is strengthen to take, two sides of mountain area many kinds of envi- ronmental disaster frequently occur, and the tendency of loss by run-off soil is more and more serious.
【Fund】: 国家自然科学基金项目(编号:40071005);; 教育部科学技术研究重点项目(编号:105152)资助~~
【CateGory Index】: P467
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