| ZENG Xiangxi,HAO Qiang,ZHOU Guangdong,LE Fengfeng,LIU Chenggang,ZHOU Wenli. 2018. Plankton respiration in the northern South China Sea during summer and winter. Acta Oceanologica Sinica, 37(8):74－83 |
| Plankton respiration in the northern South China Sea during summer and winter |
| 南海北部冬、夏季浮游群落呼吸率 |
| Received:January 21, 2017 Revised:July 18, 2017 |
| DOI：10.1007/s13131-018-1213-5 |
| Key words:northern South China Sea plankton community respiration phytoplankton bacteria |
| 中文关键词: 南海北部 浮游群落 呼吸率 浮游植物 细菌 |
| 基金项目:The National Natural Science Foundation of China (NSFC) under contract Nos 90711006, 41306162 and 41006101; the National Key Research and Development Program of China under contract No. 2016YFC1401601; the National Programme on Global Change and Air-Sea Interaction under contract No. GASI-0301-03-03. |
| Author Name | Affiliation | E-mail | | ZENG Xiangxi | Key Laboratory of Marine Ecosystem and Biogeochemistry, Second Institute of Oceanography, State Oceanic Administration, Hangzhou 310012, China
Center for Marine Ranching Engineering Science Research of Tianjin, Tianjin Bohai Sea Fisheries Research Institute, Tianjin 300457, China
Tianjin Key Laboratory of Aqua-ecology and Aquaculture, College of Fisheries, Tianjin Agricultural University, Tianjin 300384, China | | | HAO Qiang | Key Laboratory of Marine Ecosystem and Biogeochemistry, Second Institute of Oceanography, State Oceanic Administration, Hangzhou 310012, China
State Key Laboratory of Satellite Ocean Environment Dynamics, Hangzhou 310012, China | haoq@sio.org.cn | | ZHOU Guangdong | Key Laboratory of Marine Ecosystem and Biogeochemistry, Second Institute of Oceanography, State Oceanic Administration, Hangzhou 310012, China | | | LE Fengfeng | Key Laboratory of Marine Ecosystem and Biogeochemistry, Second Institute of Oceanography, State Oceanic Administration, Hangzhou 310012, China | | | LIU Chenggang | Key Laboratory of Marine Ecosystem and Biogeochemistry, Second Institute of Oceanography, State Oceanic Administration, Hangzhou 310012, China
State Key Laboratory of Satellite Ocean Environment Dynamics, Hangzhou 310012, China | | | ZHOU Wenli | Tianjin Key Laboratory of Aqua-ecology and Aquaculture, College of Fisheries, Tianjin Agricultural University, Tianjin 300384, China | |
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| Abstract: |
| 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. |
| 中文摘要: |
| 浮游群落呼吸率是海洋碳循环的重要组成，对海洋生态系统自养同化和异养生产至关重要。本研究对冬夏季南海北部（nSCS）真光层内浮游群落呼吸率（CReu）、叶绿素a浓度（Chl a）、细菌丰度（BAC）以及溶解氧浓度（DO）进行观测。结果显示，南海北部CReu存在显著的时空变化（范围为0.03-1.10 μmol/（L·h））。冬季CReu（0.53±0.27 μmol/（L·h）），约为夏季CReu（0.26±0.20 μmol/（L·h））的2倍，且均呈现由近岸向开阔海域逐渐降低的趋势。这些分布差异取决于nSCS海域受季风驱动的“物理-化学-生物”耦合作用。结果同时表明，CReu与Chl a、BAC和DO呈正相关，且BAC对CReu可变性的贡献最高。进一步研究发现，在CReu与各环境因子的多元线性关系中，细菌和浮游植物生物量对CReu起决定性作用（R2=0.82，p<0.05）。基于上述经验关系，本文估算得到整个研究区域100 m内水柱浮游群落呼吸率，分析认为水柱内的浮游群落呼吸率与其生物量间可能存在着非线性关系。 |
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