SCSIO OpenIR  > 热带海洋环境国家重点实验室(LTO)
Physical-biological coupling of N-2 fixation in the northwestern South China Sea coastal upwelling during summer
Zhang, Run; Chen, Min; Yang, Qing; Lin, Yuanshao; Mao, Huabin; Qiu, Yusheng; Tong, Jinlu; Lv, E.; Yang, Zhi; Yang, Weifeng; Cao, Jianping; mchen@xmu.edu.cn
2015
Source PublicationLIMNOLOGY AND OCEANOGRAPHY
Volume60Issue:4Pages:1411-1425
AbstractHere, we present the first combined results of N-2 fixation rates (N-15(2) assay), dissolved iron (dFe,<0.2 m), and primary production (PP) (C-14 assay) in the northwestern South China Sea (NWSCS) coastal upwelling region during summer. Surface N-2 fixation rate ranged between 0.1 nmol N L-1 d(-1) and 5.6 nmol N L-1 d(-1) (average 1.0 nmol N L-1 d(-1), n=50) under nonbloom conditions. At a Trichodesmium bloom station, N-2 fixation rate was approximate to 3 orders of magnitude higher. Depth-integrated N-2 fixation rate ranged between 7.5 mol N m(-2) d(-1)and 163.1 mol N m(-2) d(-1) (average 46.4 mol N m(-2) d(-1)). Our results indicate that N-2 fixation is unlikely limited by Fe availability in the NWSCS continental waters, instead, the coastal upwelling-induced combined effects of physical and biological processes may have played a decisive role. With the upwelled cold, dFe-rich, nutrient-replete waters, nondiazotrophic phytoplankton growth would be preferentially enhanced while N-2 fixation was hindered due to relative deficiency of phosphate caused by massive phytoplankton utilization in the coastal upwelling. By comparison, N-2 fixation was notably elevated along with decreased PP in the offshore waters, probably due to a shift from P-deficiency to N-deficiency. Consistently, the contribution of N-2 fixation to PP (0.01-2.52%) also increased toward the open waters. As a significant external N source, summertime N-2 fixation is estimated to contribute a flux of 1.4 Gmol N to this area under nonbloom conditions. This study adds to the knowledge of N-2 fixation in the rarely studied subtropical coastal upwellings, and highlights the necessity of future comprehensive studies in such highly dynamic environments.
Department[Zhang, Run; Chen, Min; Yang, Qing; Lin, Yuanshao; Qiu, Yusheng; Tong, Jinlu; Lv, E.; Yang, Zhi; Yang, Weifeng; Cao, Jianping] Xiamen Univ, Coll Ocean & Earth Sci, Xiamen, Peoples R China; [Chen, Min; Qiu, Yusheng; Yang, Weifeng] Xiamen Univ, State Key Lab Marine Environm Sci, Xiamen, Peoples R China; [Yang, Qing] Natl Marine Environm Monitoring Ctr, Dalian, Peoples R China; [Mao, Huabin] Chinese Acad Sci, South China Sea Inst Oceanol, State Key Lab Trop Oceanog, Guangzhou, Guangdong, Peoples R China ; LTO
Subject AreaMarine & Freshwater Biology ; Oceanography
Document Type期刊论文
Identifierhttp://ir.scsio.ac.cn/handle/344004/14965
Collection热带海洋环境国家重点实验室(LTO)
Corresponding Authormchen@xmu.edu.cn
Recommended Citation
GB/T 7714
Zhang, Run,Chen, Min,Yang, Qing,et al. Physical-biological coupling of N-2 fixation in the northwestern South China Sea coastal upwelling during summer[J]. LIMNOLOGY AND OCEANOGRAPHY,2015,60(4):1411-1425.
APA Zhang, Run.,Chen, Min.,Yang, Qing.,Lin, Yuanshao.,Mao, Huabin.,...&mchen@xmu.edu.cn.(2015).Physical-biological coupling of N-2 fixation in the northwestern South China Sea coastal upwelling during summer.LIMNOLOGY AND OCEANOGRAPHY,60(4),1411-1425.
MLA Zhang, Run,et al."Physical-biological coupling of N-2 fixation in the northwestern South China Sea coastal upwelling during summer".LIMNOLOGY AND OCEANOGRAPHY 60.4(2015):1411-1425.
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