Bottom-up control of phytoplankton growth in spring blooms in Central Yellow Sea,China |
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| Affiliation: | 1. Ocean Circulation and Climate Research Division, Korea Institute of Ocean Science and Technology, 1270 Sadong, Ansan 426-744, Republic of Korea;2. Faculty of Science, Hokkaido University, Sapporo, Japan;3. School of Earth and Environmental Sciences, Seoul National University, Seoul 151-742, Republic of Korea;1. Key Laboratory of Marine Chemistry Theory and Technology, Ministry of Education, Ocean University of China, 238 Songling Road, Qingdao 266100, China;2. First Institute of Oceanography, State Oceanic Administration, 6 Xianxialing Road, Qingdao 266061, China;3. Laboratory of Marine Ecology and Environmental Science, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266071, China |
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| Abstract: | The source and significance of three nutrients – nitrogen, phosphorous and silicon – were investigated by a modified dilution method performed on seawater samples from the Central Yellow Sea (CYS), in spring blooming period of 2007. This modified dilution method accounted for the phytoplankton growth rate, microzooplankton grazing mortality rate, the internal and external nutrient pools, as well as nutrients supplied through remineralization by microzooplankton grazing. The results indicate that phytoplankton growth during the bloom is mostly contributed by internal nutrient pools (KI=0.062–1.730). The external nutrient pools (KE=<0–0.362) are also of importance for phytoplankton growth during the bloom at some sampling sites. Furthermore, the contribution of the recycled-nutrient pool by remineralization (KR=<0–0.751) is significant when microzooplankton grazing rate was higher than 0.5 d−1 during the spring phytoplankton blooms in the Central Yellow Sea. Compared with internal phosphorus, internal nitrogen and silicon contribute more to the phytoplankton production at most sampling stations. |
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| Keywords: | External nutrient Internal nutrient Remineralized nutrient Central Yellow Sea Spring bloom Nutrient limitation |
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