Variations of paleoproductivity in the past decades and the environmental implications in the Changjiang Estuary in China

JIN Hai-yan; CHEN Jian-fang; WENG Huan-xin; LI Hong-liang; ZHANG Wei-yan; XU Jie; BAI You-cheng; WANG Kui

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Article Navigation > Haiyang Xuebao > 2009 > 31(2): 113-119

JIN Hai-yan, CHEN Jian-fang, WENG Huan-xin, LI Hong-liang, ZHANG Wei-yan, XU Jie, BAI You-cheng, WANG Kui. Variations of paleoproductivity in the past decades and the environmental implications in the Changjiang Estuary in China[J]. Haiyang Xuebao, 2009, 31(2): 113-119.

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Variations of paleoproductivity in the past decades and the environmental implications in the Changjiang Estuary in China

1.
Department of Geoscience, Zhejiang University, Hangzhou 310027, China;Laboratory of Marine Ecosystem and Biogeochemistry of State Oceanic Administration, Second Institute of Oceanography, State Oceanic Administration.Hangzhou 310012, China
2.
Laboratory of Marine Ecosystem and Biogeochemistry of State Oceanic Administration, Second Institute of Oceanography, State Oceanic Administration.Hangzhou 310012, China
3.
Department of Geoscience, Zhejiang University, Hangzhou 310027, China
4.
Laboratory of Submarine Geosciences of State Oceanic Administration, Second Institute of Oceanography, State Oceanic Administration, Hangzhou 310012, China

Received Date: 2008-06-06
Rev Recd Date: 2008-12-16

Abstract

Abstract

Stable organic carbon isotope, biogenic silicate and chlor in were studied from a sediment core for discussing the variation of paleoproductivity and environmental implications in the past decades in the Changjiang Estuary.The shifting of structures of phytoplankton community in the past decades were disscused using the records of these biomarkers with the long-term variations of nutrient concentrations and their ratios.The results show that δ¹³C values range from - 26.15×10^-3 to - 19.5×10^-3, suggesting the mixing of organic carbon sources of riverine with marine or ganisms.The biogenic proxies present three stages of paleoproductivity changes: before the 1950s with low production; the 1950s——the 1980s with increasing production dominated by diatoms, consistent with increasing of nutrient concentrations; shallower before the 1980s with decreasing production.In this stage, the diatom production decreased while the production of other phytoplankton communities increased affected by high nutrients inputs and high content ratios of nitrogen to phosphorus and phosphorus to silicon in the Changjiang Estuary.The sedimentation records also indicated that the riverine organic carbon increased after the 1980s.
- paleoproductivity,
- stable organic carbon isotope,
- biogenic silicate,
- chlorin,
- Changjiang Estuary

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