Plankton respiration in the northern South China Sea during summer and winter

被引:0
|
作者
Xiangxi Zeng
Qiang Hao
Guangdong Zhou
Fengfeng Le
Chenggang Liu
Wenli Zhou
机构
[1] Second Institute of Oceanography,Key Laboratory of Marine Ecosystem and Biogeochemistry
[2] State Oceanic Administration,Center for Marine Ranching Engineering Science Research of Tianjin
[3] Tianjin Bohai Sea Fisheries Research Institute,Tianjin Key Laboratory of Aqua
[4] State Key Laboratory of Satellite Ocean Environment Dynamics,ecology and Aquaculture, College of Fisheries
[5] Tianjin Agricultural University,undefined
来源
Acta Oceanologica Sinica | 2018年 / 37卷
关键词
northern South China Sea; plankton community; respiration; phytoplankton; bacteria;
D O I
暂无
中图分类号
学科分类号
摘要
Plankton respiration is an important part of the carbon cycle and significantly affects the balance of autotrophic assimilation and heterotrophic production in oceanic ecosystems. In the present study, respiration rates of the euphotic zone plankton community (CReu), size fractionated chlorophyll a concentration (Chl a), bacterial abundance (BAC), and dissolved oxygen concentration (DO) were investigated during winter and summer in the northern South China Sea (nSCS). The results show that there were obvious spatial and temporal variations in CReu in the nSCS (ranging from 0.03 to 1.10 µmol/(L·h)), CReu in winter ((0.53±0.27) µmol/(L·h)) was two times higher than that in summer ((0.26±0.20) µmol/(L·h)), and decreased gradually from the coastal zone to the open sea. The distribution of CReu was affected by coupled physical-chemical-biological processes, driven by monsoon events. The results also show that CReu was positively correlated with Chl a, BAC, and DO,and that BAC contributed the highest CReu variability. Furthermore, the results of the stepwise multiple linear regression suggest that bacteria and phytoplankton were the dominant factors in determining CReu (R2 = 0.82, p<0.05) in the nSCS. Based on this relationship, we estimated the integrated water column respiration rate (CRint) within 100 m of the investigated area, and found that the relationship between the biomass of the plankton community and respiration may be nonlinear in the water column.
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页码:74 / 83
页数:9
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