期刊
SCIENCE OF THE TOTAL ENVIRONMENT
卷 674, 期 -, 页码 592-602出版社
ELSEVIER
DOI: 10.1016/j.scitotenv.2019.04.176
关键词
N-2 fixation; Daya Bay; Northern South China Sea; Carbon fixation; Dissolved organic carbon (DOC); Heterotrophic diazotrophs
资金
- National Basic Research Program of China [2015CB452903, 2015CB452902]
- National Natural Science Foundation of China [41676174, 41721005]
- Chinese Ministry of Science and Technology [2017FY201403]
We present the first concurrent measurements of N-2 fixation rates (N-15(2) uptake), primary production (C-14 uptake), dissolved organic carbon (DOC) concentrations, and diazotrophic community composition derived from nitrogenase (nifH) abundance in the subtropical Daya Bay (DB) of the coastal northern South China Sea (NSCS) from 2015 to 2017. N-2 fixation rates ranged from n.d. -4.51 nmol N L-1 h(-1). Such values were generally higher than those reported in the neighbouring NSCS open waters and several well-studied oligotrophic waters, thereby suggesting that N-replete conditions do not prevent N-2 fixation in coastal waters. N-2 fixation rates were positively and significantly correlated with the primary production and the concentration of DOC in DB in the spring and summer. Combined with other lines of evidence, we suggest that N-2 fixation may be facilitated by non-diazotrophic phytoplankton via a probable regulation of the quantity and quality (bioavailability) of DOC in DB. Since DB represents a suitable site that has experienced dramatic human-induced changes in environmental conditions, our results likely provide insights in understanding how N-2 fixation and relevant biogeochemical processes may respond to intensified global anthropogenic forcing in similar coastal settings. (C) 2019 Elsevier B.V. All rights reserved.
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