| Isotopic Tracing of Trophication Processes over the Last Millennia on Lake Chenghai |
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| 作者姓名： | 吴敬禄 王苏民 夏威岚 |
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| 作者单位： | Nanjing Institute of Geography & Limnology，Chinese Acad emy of Sciences，Nanjing Institute of Geography & Limnology，Chinese Acad emy of Sciences，Nanjing Institute of Geography & Limnology，Chinese Acad emy of Sciences Nanjing 210008，China，Nanjing 210008，China，Nanjing 210008，China |
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| 基金项目： | theKeyInnovationProjectofChineseAcademyofSciences (KZCX1 SW 0 1 1 5)，theNationalNaturalScienceFoundationofChina (GrantNo .40 2 730 0 4 ) |
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| 摘 要： | Multi-parameter studies (stable isotopes in carbonate and organic matter, pigment,organic carbon and nitrogen contents) from a 660-yr continuous sediment core from Lake Cheng-hai, a closed, eutropic lake in southern China, provide information on lake historical eutrophi-cation. During the last 660 years, great changes have taken place in productivity and eutrophi-cation of Lake Chenghai in response to human activities. In 1690, the productivity of the lakebegan to increase as Lake Chenghai became closed from agriculture in the lake‘‘ s watershed. In 1942, Lake Chenghai evolved to eutrophic state, marked by an increase in organic carbon, ni-trogen, CaC03, pigment contents and obvious negative values of stable isotopes, which is more or less simultaneous with the large-scale population immigration during the period. In 1984, in-tensive human activities induced modern lacustrine productivity and eutrophic level. Human-in-duced trophic changes during the past few decades have affected the Lake Chenghai ecosystem tosuch an extent that it has never experienced before in the last 660 years.
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| 关 键 词： | 稳定同位素 Chenghai湖 超营养作用 同位素地质学 营养过程 湖泊沉积 |
Isotopic tracing of trophication processes over the last millennia on Lake Chenghai |
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| Wu?Jinglu,Wang?Sumin,Xia?Weilan.Isotopic Tracing of Trophication Processes over the Last Millennia on Lake Chenghai[J].Chinese Journal of Geochemistry,2003,22(3):271-279. |
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| Authors: | Wu Jinglu Wang Sumin Xia Weilan |
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| Institution: | (1) Nanjing Institute of Geography & Limnology, Chinese Academy of Sciences, 210008 Nanjing, China |
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| Abstract: | Multi-parameter studies (stable isotopes in carbonate and organic matter, pigment, organic carbon and nitrogen contents) from
a 660-yr continuous sediment core from Lake Chenghai, a closed, eutropic lake in southern China, provide information on lake
historical eutrophication. During the last 660 years, great changes have taken place in productivity and eutrophication of
Lake Chenghai in response to human activities. In 1690, the productivity of the lake began to increase as Lake Chenghai became
closed from agriculture in the lake’s watershed. In 1942, Lake Chenghai evolved to eutrophic state, marked by an increase
in organic carbon, nitrogen, CaCO3, pigment contents and obvious negative values of stable isotopes, which is more or less simultaneous with the large-scale
population immigration during the period. In 1984, intensive human activities induced modem lacustrine productivity and eutrophic
level. Human-induced trophic changes during the past few decades have affected the Lake Chenghai ecosystem to such an extent
that it has never experienced before in the last 660 years.
This study was supported by the Key Innovation Project of Chinese Academy of Sciences (KZCX1-SW-01-15), and the National Natural
Science Foundation of China (Grant No. 40273004). |
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| Keywords: | stable isotope pigment content lake eutrophication productivity L ake Chenghai |
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