DOI: 10.1002/2018JG004418
Scopus记录号: 2-s2.0-85045526704
论文题名: Nitrogen Fixation in the Intertidal Sediments of the Yangtze Estuary: Occurrence and Environmental Implications
作者: Hou L. ; Wang R. ; Yin G. ; Liu M. ; Zheng Y.
刊名: Journal of Geophysical Research: Biogeosciences
ISSN: 21698953
出版年: 2018
卷: 123, 期: 3 起始页码: 936
结束页码: 944
语种: 英语
英文关键词: eutrophication
; hypereutrophic estuary
; nifH gene
; nitrogen fixation
; sediment
Scopus关键词: benthic environment
; environmental conditions
; estuarine sediment
; eutrophic environment
; eutrophication
; intertidal environment
; nitrogen
; nitrogen fixation
; nitrogen isotope
; sediment chemistry
; China
; Yangtze Estuary
英文摘要: Nitrogen fixation is a microbial-mediated process converting atmospheric dinitrogen gas to biologically available ammonia or other molecules, and it plays an important role in regulating nitrogen budgets in coastal marine ecosystems. In this study, nitrogen fixation in the intertidal sediments of the Yangtze Estuary was investigated using nitrogen isotope tracing technique. The abundance of nitrogen fixation functional gene (nifH) was also quantified. The measured rates of sediment nitrogen fixation ranged from 0.37 to 7.91 nmol N g−1 hr−1, while the abundance of nifH gene varied from 2.28 × 106 to 1.28 × 108 copies g−1 in the study area. The benthic nitrogen fixation was correlated closely to the abundance of nifH gene and was affected significantly by salinity, pH, and availability of sediment organic carbon and ammonium. It is estimated that sediment nitrogen fixation contributed approximately 9.3% of the total terrigenous inorganic nitrogen transported annually into the Yangtze estuarine and coastal environment. This result implies that the occurrence of benthic nitrogen fixation acts as an important internal source of reactive nitrogen and to some extent exacerbates nitrogen pollution in this aquatic ecosystem. ©2018. American Geophysical Union. All Rights Reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/114386
Appears in Collections: 气候减缓与适应
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作者单位: State Key Laboratory of Estuarine and Coastal Research, East China Normal University, Shanghai, China; School of Geographic Sciences, East China Normal University, Shanghai, China; Key Laboratory of Geographic Information Science (Ministry of Education), East China Normal University, Shanghai, China
Recommended Citation:
Hou L.,Wang R.,Yin G.,et al. Nitrogen Fixation in the Intertidal Sediments of the Yangtze Estuary: Occurrence and Environmental Implications[J]. Journal of Geophysical Research: Biogeosciences,2018-01-01,123(3)