Lacustrine environment responses to human activities in the past 300 years in Longgan Lake catchment,southeast China |
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Authors: | Yang Xiangdong Wang Sumin Shen Ji Zhu Yuxin Zhang Zhenke and Wu Yanhong |
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Institution: | 1. Nanjing Institute of Geography and Limnology,Chinese Academy of Sciences,Nanjing 210008,China 2. Department of Urban and Resource Science,Nanjing University,Nanjing 210093,China |
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Abstract: | The chronology of a gravity core sediment from Longgan Lake center was defined by210Pb, combining with historic events recorded by document and sediment. The relationship between vegetation, soil erosion and
lake nutrient state was discussed based on pollen, magnetic parameters, diatoms, phosphorus and pigments. The results show
that the lake has undergone twice obvious transformations from oligotrophic to mesotrophic condition. Two eutrophications
occurring at about 1768AD and the beginning of the 20th century respectively were related to external nutrient loading increase
resulting from the enhanced human activities in the lake catchment. It is probable that strength of human actions in historic
periods was influenced more or less by climatic changes. The lake eutrophication presented a more serious tendency because
of the wide use of chemical fertilizer, reclamation of wetland and wetland vegetation destruction around the lake in the last
40 years. |
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Keywords: | historic periods catchment of Longgan Lake human activities lake eutrophication |
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