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General Session 3: Biological oceanography & global change |
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Plankton respiration in the northern South China Sea during summer and winter
GS3-68-S
Xiangxi Zeng* , Department of Fishery Science, Tianjin Agricultural Unversity; Second Institute of Oceanography, State Oceanic Administration
Qiang Hao, Second Institute of Oceanography, State Oceanic Administration
Fengfeng Le, Second Institute of Oceanography, State Oceanic Administration
Presenter Email: zengxiangxi1221@163.com
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| Abstract: Plankon respiration is an important part of carbon cycle and significantly effects the balance of autotrophic assmilation and hetertrophic production in the oceanic ecosystem. In the present study, the euphotic zone planktonic community respiration rates (CReu), size fractionated chlorophyll concertration (Chl) , bacterial abundance (BAC) and dissolved oxygen concentration (DO) were investigated during the winter and summer in the northern South China Sea (nSCS). The results showed that CReu had obviously spatial and temporal variation in the nSCS (ranged from 0.03 to 1.10 μmol·L-1·h-1). CReu in winter (0.53±0.27 μmol·L-1·h-1) was two times higher than that in summer (0.26±0.20 μmol·L-1·h-1), and decreased from the coastal zone to the open sea. The distribution of CReu was impacted by the coupled physical-chemical-biological processes, driven by the monsoon. The results alsoshowed that Chl , BAC, and DO had postive correlations with CReu, and BAC contributed the highest variability of CReu. Furthermore, the step multiple linear regression results suggested that bacteria and phytoplankton were the dominant factors of CReu (R2=0.80) in the nSCS. Based on this relationship, the integrated water column respiration rate (CRint) was estimated, and was compared with modeled primary production in the study area. We found the net community production was positive in the coastal zone and negative in the open sea in the both of seasons. Key words: northern of South China Sea, planktonic community, respiration rate, phytoplanton, bacteria |
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