Size structure and potential export of phytoplankton primary production in the southern Huanghai(Yellow) Sea

FU Ming-zhu; WANG Zong-ling; SUN Ping; LI Yan; LI Rui-xiang

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FU Ming-zhu, WANG Zong-ling, SUN Ping, LI Yan, LI Rui-xiang. Size structure and potential export of phytoplankton primary production in the southern Huanghai(Yellow) Sea[J]. Haiyang Xuebao, 2009, 31(6): 100-109.

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Size structure and potential export of phytoplankton primary production in the southern Huanghai(Yellow) Sea

1.
First Institute of Oceanography, SOA, Qingdao 266061, China;Key Lab of Science and Engineering for Marine Ecological Environment, SOA, Qingdao 266061, China;Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China
2.
First Institute of Oceanography, SOA, Qingdao 266061, China;Key Lab of Science and Engineering for Marine Ecological Environment, SOA, Qingdao 266061, China

Received Date: 2009-05-28
Rev Recd Date: 2009-08-27

Abstract

Abstract

The distribution and environmental control of total and size-fractionated phytoplankton primary production in the Southern Huanghai(Yellow) Sea were studied based on the investigation conducted under summer stratification and winter mixing conditions in 2006.The mean level of euphotic zone integrated primary production in summer and winter were 30.69 mg/(m²·h) and 21.73 mg/(m²·H) respectively.High levels of primary production were observed in the Changjiang River diluted water influenced area in summer, while in winter the high level zone shifted northerly to the adjacent of Haizhou Bay. The relative contributions of different size fractions of phytoplankton were in the sequence of micro(42.8%) >nano (29.6%)>pico(27.6%) in summer and pico(41.2%)> nano(36.5%) > micro(22.3%) in winter. The relationships between the primary production and environmental factors showed that the variations of nutrients availability and light regimes driven by the hydrodynamic conditions were the main causes of primary production distribution features. The food-web mediated carbon pathway and potential export were also qualitatively analyzed with simple ecological ratios. Microbial food web played important roles both in summer and in winter, and in general the pelagic ecosystem of the southern Huanghai Sea showed a weak carbon export potential.
- southern Huanghai(Yellow) Sea,
- phytoplankton,
- primary production,
- size structure,
- carbon pathway

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