LAKE ENVIRONMENTAL CHARACTERISTICS RECOREDED BY ISOTOPES IN SEDIMENTS OF DAPU AREA IN LAKE TAIHU

XU Longsheng; WU Jinglu

doi:10.3724/SP.J.1140.2013.02137

Marine Geology & Quaternary Geology > 2013 > 33(2): 137-142. > DOI: 10.3724/SP.J.1140.2013.02137

XU Longsheng, WU Jinglu. LAKE ENVIRONMENTAL CHARACTERISTICS RECOREDED BY ISOTOPES IN SEDIMENTS OF DAPU AREA IN LAKE TAIHU[J]. Marine Geology & Quaternary Geology, 2013, 33(2): 137-142. DOI: 10.3724/SP.J.1140.2013.02137

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LAKE ENVIRONMENTAL CHARACTERISTICS RECOREDED BY ISOTOPES IN SEDIMENTS OF DAPU AREA IN LAKE TAIHU

XU Longsheng^1,2,
WU Jinglu¹

1. State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography & Limnology, CAS, Nanjing 210008, China;
2. Graduate university of the Chinese Academy of sciences, Beijing 100039, China

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Received Date: May 28, 2012
Revised Date: July 12, 2012

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Abstract

Abstract

Through the determinations of δ¹³C, δ¹⁵N, total organic C, total N, total P in sediments of Dapu area in the Taihu Lake, this paper analyzed the eutrophication process of this area. The results showed that δ¹³C, δ¹⁵N in sediments had a significant change in patferns with the water evolution from low nutrition to eutrophication. Before 1950s, primary productivity of the lake was low and the water environment was good. Moreover, the impact of human activities was weak, and the lake sediments record showed a high value of δ¹³C and low values of δ¹⁵N, TOC, TN, TP. In 1990s, the lake environment changed significantly and the primary productivity increased substantially. As the result, the water environment deteriorated and the nutrition level increased rapidly resulting in eutrophication. Accordingly, the value of δ¹³C decreased rapidly, but δ¹⁵N increased, and the correlation showed significant reverse(R=-0.81). However, the correlation between δ¹³C and δ¹⁵N was significantly positive(R=0.96). This phenomenon reflected that the isotopic elements of different lakes responded differently to environmental changes, and the eutrophication patterns of grass-type lake and algae-type lake were initially established.
- lake sediment,
- stable isotope,
- eutrophication,
- Taihu Lake

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References (35)

References

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LAKE ENVIRONMENTAL CHARACTERISTICS RECOREDED BY ISOTOPES IN SEDIMENTS OF DAPU AREA IN LAKE TAIHU