^(137)Cs tracing of lacustrine sediments in the Dalian Lake,Qinghai Province,China

查看全文 作　　者：VAN Ping, DONG Guangrong & DONG ZhibaoChina Certer of Desert Research at Beijing Normal University, Beijing100875, China:Key Laboratory of Environmental Change and Natural Disaster, the Ministry of Education of China, Beijing Normal University, Beijing 100875, China;Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730000, China

出　　处：《Chinese Science Bulletin》索引2001年第46卷第S1期,共5页

基　　金：This work was supported by the National Key Basic Research Program of China (Grant No. 0048702) ; the National Natural Science Founda- tion of China (Grant No. 40001001). 摘　　要：Based upon the analysis of Cs and grain-size parameters, the total amounts of 137Cs deposition by wind and water in the Dalian Lake of Gonghe Basin, Qinghai Province are defined. The vertical profile of 137Cs in the lacustrine sediments exhibits three 137Cs activity maxima and one minimum. The major maximum corresponds to the global I37Cs fallout in 1963; the two secondary maxima correspond to the leakage of the Chernobyl reactor in 1986 and complete desiccation of the lake in 1994, respectively. The minimum corresponds to aeolian deposition caused by extensive reclamation in the late 1980s and early 1990s. The 137Cs data set was used to evaluate average sedimentation rate of the Dalian Lake since 1963. The deposition was stable in 1963-1986 and 1994-1998, and it was rapid during 1986?994. This preliminary study reveals that l37Cs has the same potential to trace environmental changes introduce by human interference in arid/semiarid regions as in humid regions. 关键词：137Cs technique DALIAN LAKE SEDIMENTATION rate.

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^(137)Cs tracing of lacustrine sediments in the Dalian Lake,Qinghai Province,China

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