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size fractionated biomass and productivity of phytoplankton and new production in the Prydz Bay and the adjacent Indian sector of the Southern Ocean during the austral summer 1998/1999

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Acta Oceanologica Sinica 2003年第4期22卷 651-670页

作者： Cai Yuming 1,3, Ning Xiuren 1,2,3, Zhu Genghai3, Shi Junxian3 1. Key Laborary of Submarine Geosciences of State Oceanic Administration,Hangzhou 310012,China. 2. Key Laborary of Ocean Dynamic Processes and Satellite Oceanography of State Oceanic Administration,Hangzhou 310012,China 3. Second Institute of Oceanography of State Oceanic Administration, Hangzhou 310012,China Key Lab. of Submarine Geosci. State Hangzhou 310012 China Second Inst. of Oceanogr. of State Hangzhou 310012 China Key Lab. of Ocean Dynamic Processes Hangzhou 310012 China

The paper deals with the studies on the cell abundance, the composition of dominant species, size fractionated biomass and productivity of phytoplankton, new production, the environmentally restricted mechanism in the Prydz Bay and the adjacent Indian sector of the Southern Ocean during the austral summer 1998/1999. The results showed that there was marked feature of spatial zonation in the sea areas investigated. In the Prydz Bay and its adjacent continental shelf, the biomass and productivity of phytoplankton were high; those of continental slope and open ocean area were obviously low. The nutrient concentration had opposite distribution trend, due to the consumption of phytoplankton. It mainly affected by the vertical stability of water column, grazing pressure of zooplankton, temperature and light etc. The results of size-fractionation showed that the average contribution of netplankton to total chlorophyll a in studied sea areas was 52.2 %, those of nano- and picoplankton were 29.4 % and 18.4 %, respectively. The average contribution of netplankton to total primary production was 52.4 %, those of nano- and picoplankton were 28.7 % and 18.9 %, separately. It is same as previous conclusion that the contribution of picoplankton to productivity is slightly larger than that to biomass of phytoplankton communities. The average new production and f-ratio were 230.6 mg/ (m(2.)d) and 0.43, respectively.

关键词： phytoplankton standing stock primary productivity size-fractionation new production the Southern Ocean

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Distribution characteristics of size-fractionated chlorophyll a, primary production and new production in the Laizhou Bay, July 1997

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Acta Oceanologica Sinica 2002年第1期21卷 135-146页

作者：蔡煜明宁修仁刘子琳刘诚刚 Key Lab of Ocean Dynamic Processes & Satellite Oceanography State Oceanic Administration Hangzhou 310012 ChinaSecond Institute of oceanography State Oceanic Administration Hangzhou 310012 China Second Institute of oceanography State Oceanic Administration Hangzhou 310012 China

The distributions of chlorophyll a concentration, primary production and new productionwere observed in the Laizhou Bay of the Bohai Sea in both spring and neap tides during July 1997. The results showed that there were marked features of spatial zonation in the surveyed area, due to the differences between the geographic environment and the hydrological conditions. Chlorophyll a, primary production and new production were all higher in spring tides than that in neap tides in the Laizhou Bay. The highest values of these parameters were encountered in the central regions of the bay. At most stations, chlorophyll a concentrations at the bottom were higher than that at the surface. The results of size-fractionated chlorophyll a and primary production showed that contributions of nanocombining pi-coplankton ( <20 μm) to total chlorophyll a and primary production were dominant in phytoplankton community biomass and production of the Laizhou Bay. The environmental factors, primary production and new production in the Laizhou Bay are compared with other sea areas.

关键词： The Laizhou Bay chlorophyll a primary production size-fractionation new production

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size-fractionated phytoplankton standing stock and primary production in the Bohai Sea during late spring

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Acta Oceanologica Sinica 2002年第3期21卷 423-435页

作者：宁修仁蔡昱明刘子琳柴扉 Key Lab of Ocean Dynamic Processes & Satellite Oceanography of State Oceanic Administraticn Hangzhou 310012 ChinaSecond Institute of Oceanography of State Oceanic Administration Hangzhou 310012 China Second Institute of Oceanography of State Oceanic Administration Hangzhou 310012 China School of Marine Sciences 5741 Libby Hall University of Marine Orono ME 04469-5741 USA

During June 1997 cruise by R/V Science No.l, observations on temporal and spatialvariations of the size-fractionated phytoplankton standing stock and primary production were carried out in the Bohai Sea. The size-fractionated chlorophyll a (Chl a) and primary production, photosynthet-ically available radiation (PAR), as well as the related physico-oceanographic and zooplanktonic parameters were measured at five time-series observation stations representing sub-areas of the sea. Results obtained show that there were the marked features of spatial zonation of Chl a and primary production in the Bohai Sea. The values in the Laizhou Bay, the Liaodong Gulf and the Bohai Gulf were high and showed close relation with tidal fluctuations, i.e. high Chi a concentration occurred during high tide in the Laizhou Bay, and during low tide in the Liaodong Gulf and the Bohai Gulf. In the strait and the central region of the Bohai Sea, the values were relatively low and no relationship with tidal fluctuation could be found. Chlorophyll a concentration vertically decreased from surface to bottom in the Liaodong Gulf and the Bohai Gulf, while it increased in the Laizhou Bay, the strait and the central region of the Bohai Sea, and the highest value was encountered at the bottom. size-fractionation results showed that nano - combining pico -plankton ( 20 μm), nano - (2- 20 fan) and picoplankton (< 2 μm) was 13% , 63% and 24% to total production, and 9% , 53% and 38% to total Chl a, respectively. It proved the importance of nano - and pico -plankton in phytoplankton communities in the Bohai Sea e-cosystems. In this paper the factors, such as light intensity and zooplankton grazing pressure, governing standing stock and production of phytoplankton in the Bohai Sea were also discussed.

关键词： Chlorophyll a primary production phytoplankton size-fractionation the Bohai Sea

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