太湖大浦湖区近百年来湖泊记录的环境信息

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Abstract The environmental evolution characteristics of Dapu area in Taihu Lake in the last 100 years are discussed through multi-proxy analysis of ¹³⁷Cs, grain size, TOC, TN, TP and geochemical elements from the core TJ-2. The results indicate that most metal elements such as Al, Mn, Cu, Cr, Ni, Zn in the sediments deposited prior to 1950s have good correlativities with the content of clay (the correlations are between 0.74 and 0.82). In that stage, the productivity was not high, the water environment was relatively good, and the sediments was characterized by a relatively lower content of nutrient elements. From 1950s to 1990s, the Dapu area got into the period of modern environmental lake, whose productivity remarkably increased, human activities seriously disturbed the lake system and the lake area reached eutrophication rapidly, which is shown by a drop of Fe/ Mn value and a sharp increase of the values of TOC, TN, TP and heavy metal elements. The changes of heavy metal elements are different from the curves of grain size and Al element. After 1990s, the content of clay increased, the nutrient elements decreased a little and various indexes of heavy metals did not change obviously. These characteristics show that the lake area kept the eutrophication character with a tendency of eutrophication being slowed down. Environmental information reflected by the core T-2 coincides with the practical environmental monitoring results.

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	Liu Jianjun
	Wu Jinglu

Key words： Taihu Lake Dapu area sediments lake eutrophication

Received: 08 December 2005

ZTFLH:

X131.2

About author: Liu Jianjun, born in 1981, is a candidate for a master' s degree in Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences and is mainly engaged in lake environmental geochemistry E mail: liujj2029@163 com.

Cite this article:

Liu Jianjun,Wu Jinglu. Environmental information of recent 100 years recorded sediments of Dapu area in Taihu Lake[J]. JOPC, 2006, 8(4): 559-564.

URL:

http://www.gdlxb.cn/EN/ OR http://www.gdlxb.cn/EN/Y2006/V8/I4/559

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