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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 1.98/1.99

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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., shi junxian3 1. key laborary of submarine Geosciences of state oceanic administration,{12.,{13., hangzhou 310012.china key Lab {1. Geosci {2. {3. Adm Hangzhou 310012 Peoples R China key Lab {1. Dynam Proc Satellite Oceanog State Ocean Adm Hangzhou 310012 Peoples R China Inst oceanog {1. ocean Adm 2 Hangzhou 310012 Peoples R 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 1.98/1.99. 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 2..4 % and 1..4 %, respectively. The average contribution of netplankton to total primary production was 52.4 %, those of nano- and picoplankton were 2..7 % and 1..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 2.0.6 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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