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《Journal of Mountain Science》 2007-02
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Temporal Variation in Annual Water Yield of the Jialingjiang River and the Formative Causes

XU Jiongxin1,SUN Ji2(1.Institute of Geographical Sciences and Natural Resources Research,Key Laboratory for Water Cycle and Related Land Surface Processes,Chinese Academy of Sciences,Beijing 100101,China;2.Southwest University of Science and Technology,Mianyang 621000,Sichuan,China)  
Based on data from the Jialingjiang River,the temporal variation in annual water yield and the formative cause have been studied,and the water reduction effect of soil and water conservation has been analyzed.The periods 1956-1980 and 1981-2000 were taken as the "baseline" period and the period with measures,and a regression equation between annual water yield and areal average precipitation has been established for the above two periods,respectively.Using the two equations,the water reduction by the decreased precipitation has been estimated as 84.3% and that by soil and water and conservation measures as 15.7%.The effect of human activity on water yield is dependent on annual precipitation.During the years with higher precipitation,the water reduction is lower,and during the years with lower precipitation,the water reduction is higher.When the annual precipitation exceeds a certain threshold,the water reduction may become negative.The temporal variation in annual runoff coefficient(R_c) is similar to that in water yield.Before 1980,no trend could be seen,but after 1980,the annual runoff coefficient tended to decrease.The effect of human activity on runoff coefficient is also dependent on annual precipitation.During the years with higher precipitation,the reduction in R_c is lower,and during the years with lower precipitation,the reduction in R_c is higher.When the annual precipitation exceeds a certain threshold,the R_c might increase.
【Fund】: 国家重点基础研究规划项目(2003CB415202 2002-2006)~~
【CateGory Index】: S157
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