Distribution, sources and budgets of particulate phosphorus and nitrogen in the East China Sea
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- 作者：Yu Yu ; Jinming Song ; Xuegang Li ; Huamao Yuan ; Ning Li
- 关键词：Suspended matter ; Particulate phosphorus ; Particulate nitrogen ; Particulate nutrient budget ; Changjiang river ; East China Sea
- 刊名：Continental Shelf Research
- 出版年：2012
- 出版时间：15 July, 2012
- 年：2012
- 卷：43
- 期：Complete
- 页码：142-155
- 全文大小：2811 K
文摘
Suspended particles were collected from the northern East China Sea (ECS) in four spring and autumn cruises to study the sources and biogeochemical behavior of particulate inorganic and organic phosphorus and nitrogen (PIP, POP, PIN, and PON). PIP and PON were dominant forms of particulate P and N, accounting for 57.2 % of TPP and 78.2 % of TPN, respectively. PIP and POP concentrations decreased seaward from the estuary, and had high values near Zhoushan Islands and in the northern ECS. It was indicated that the Changjiang dilute water (CDW) and the Jiangsu coastal currents (JCC), which were rich in particulate phosphorus were the major sources of PIP and POP. PIN and PON concentrations exhibited decreasing trend from the middle shelf toward land and offshore, suggesting the dilution effect of N-depleted riverine particles on particulate nitrogen in coastal waters. The highest concentrations of PIN and PON were observed in the coast of Zhejiang and in the northern ECS, which were two productive areas in the ECS. PON and PIN were primarily of marine source and POP was also influenced by phytoplankton productivity. The concentrations, compositions and distribution of particulate nutrients varied between spring and autumn, in response to the seasonal variations of phytoplankton productivity and terrestrial input. Budget calculation demonstrated that the sediment flux of Changjiang accounted for 88 % of total input flux in spring and summer, indicating that the Changjiang River was the major particle source in the ECS. Particulate P was mainly from phytoplankton and the input of the Changjiang River, while the major source of particulate N was phytoplankton. Phytoplankton production contributed 70 % of TPP input flux and 95 % of TPN input flux in spring and summer, while 64 % of TPP input and 89 % of TPN input in autumn and winter. It was shown that riverine particles were enriched in inorganic P, whereas marine particles had high organic P and N content, which suggested that the component characteristics of particles could be used to identify the particle sources.