Physical-biological coupling of N-2 fixation in the northwestern South China Sea coastal upwelling during summer
文献类型：期刊论文
| 作者 | Zhang, Run; Chen, Min; Yang, Qing; Lin, Yuanshao; Mao, Huabin; Qiu, Yusheng; Tong, Jinlu; Lv, E.; Yang, Zhi; Yang, Weifeng |
| 刊名 | LIMNOLOGY AND OCEANOGRAPHY
 |
| 出版日期 | 2015 |
| 卷号 | 60期号:4页码:1411-1425 |
| 通讯作者 | mchen@xmu.edu.cn |
| 中文摘要 | Here, 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. |
| 学科主题 | Marine & Freshwater Biology; Oceanography |
| 源URL | [http://ir.scsio.ac.cn/handle/344004/14965]  |
| 专题 | 南海海洋研究所_热带海洋环境国家重点实验室(LTO) |
| 推荐引用方式 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.,...&Cao, Jianping.(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. |
入库方式： OAI收割
来源：南海海洋研究所
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