| First investigation of desert Lake Hongjiannao, Shannxi Province based on its sediment study |
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| 作者姓名： | 汪勇 沈吉 羊向东 张恩楼 刘兴起 刘恩峰 肖霞云 |
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| 作者单位： | Nanjing Institute of Geography and Limnology Chinese Academy of Sciences Nanjing 210008 China，Graduate School Chinese Academy of Sciences Beijing 100039 China，Nanjing Institute of Geography and Limnology Chinese Academy of Sciences Nanjing 210008 China，Nanjing Institute of Geography and Limnology Chinese Academy of Sciences Nanjing 210008 China，Nanjing Institute of Geography and Limnology Chinese Academy of Sciences Nanjing 210008 China，Nanjing Institute of Geography and Limnology Chinese Academy of Sciences Nanjing 210008 China，Nanjing Institute of Geography and Limnology Chinese Academy of Sciences Nanjing 210008 China，Nanjing Institute of Geography and Limnology Chinese Academy of Sciences Nanjing 210008 China |
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| 基金项目： | SponsoredbyProject“973”(2004CB720205)ofNationalKeyBasicResearchDevelopmentPlanningandKeyResearchDirectionProject“Re-lationbetweensandstormsandenvironment”ofInnovationProjectofCAS. |
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| 摘 要： | 1IntroductionGlobal change studies on the decennial and cen-tennial timescales,which can help put together the in-formation from long timescale study and meteorologicalstudy,is crucial for predicting future global changes(Hegerl,1998;Wang Pinxian and Jian Zhimin,1999;Wang Sumin et al.,1998).Lacustrine sedi-ments characterized by their continuity,major sedi-mentation rate,and high resolution can provide usefulinformation for reconstructing the past global changes(Steven,1996;Wang Sumin and …
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| 关 键 词： | 陕西 荒漠化 湖泊 沉积物 全球气候变化 |
| 收稿时间： | 29 March 2005 |
First investigation of desert Lake Hongjiannao, Shannxi Province based on its sediment study |
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| Wang Yong,Shen Ji,Yang Xiangdong,Zhang Enlou,Liu Xingqi,Liu Enfeng,Xiao Xiayun.First investigation of desert Lake Hongjiannao, Shannxi Province based on its sediment study[J].Chinese Journal of Geochemistry,2006,25(3):285-294. |
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| Authors: | Wang Yong Shen Ji Yang Xiangdong Zhang Enlou Liu Xingqi Liu Enfeng Xiao Xiayun |
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| Institution: | (1) Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, 210008 Nanjing, China;(2) Graduate School, Chinese Academy of Sciences, 100039 Beijing, China |
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| Abstract: | By multi-proxy analysis of grain-size, magnetic susceptibility (MS), Fe/Mn and Rb/Sr ratios, TOC and other chemical elements, environmental changes in the Hongjiannao Lake over the past 80 years were discussed. It is revealed that the lake formed during 1928-1952 A.D., characterized by relatively high Fe/Mn ratio and lower Rb/Sr ratio, MS value and lake productivity. During this period sandstorms were prevalent with three extremes occurring in 1936, 1939 and 1941 A.D., respectively. In the short time period of 1952-1960 A.D., the water level of the lake rose remarkably, as shown by a sharp increase in coarse slit and MS value, as well as the obvious dilution of geochemical element concentrations in lake sediments. The lake expansion is ascribed to both much more rainfall and human activities, especially in about 1958 A.D., when a great deal of channeled-off water from the around swamps was let to inpour into the lake. The lithological characteristics and sediment proxies reflect that the Hongjiannao Lake has already developed into a stable deep lake since the 1960s, characterized by the higher lake productivity and Rb/Sr ratio and lower Fe/Mn ratio. The frequency and intensity of sandstorms have also reduced greatly since the 1960s due to natural conservation activities. The drop of water level since the middle of the 1990s may be related to a warm and dry climate. |
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| Keywords: | lacustrine sediment lake evolution history paleosandstorm characteristics Hongjiannao Lake |
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