DOI: 10.1016/j.scitotenv.2019.136052
论文题名: Changing riverine organic C:N ratios along the Pearl River: Implications for estuarine and coastal carbon cycles
作者: Liu Q. ; Liang Y. ; Cai W.-J. ; Wang K. ; Wang J. ; Yin K.
刊名: Science of the Total Environment
ISSN: 489697
出版年: 2020
卷: 709 语种: 英语
英文关键词: Anthropogenic perturbation
; Coastal ocean carbon cycle
; Organic C:N ratio
; Pearl River
; Riverine organic carbon flux
Scopus关键词: Biogeochemistry
; Budget control
; Estuaries
; Gems
; Marine biology
; Nitrogen
; Phytoplankton
; Rivers
; Anthropogenic perturbation
; C:N ratio
; Coastal ocean
; Organic carbon fluxes
; Pearl River
; Organic carbon
; fresh water
; inorganic compound
; organic carbon
; organic matter
; organic nitrogen
; anthropogenic source
; carbon cycle
; carbon flux
; carbon isotope ratio
; carbon sink
; nitrogen cycle
; perturbation
; Article
; carbon cycle
; carbon source
; correlational study
; estuary
; priority journal
; seashore
; stream (river)
; urban area
; water sampling
; China
; Guangdong
; Zhujiang Estuary
英文摘要: In the traditional view, riverine organic matter typically has a higher C:N ratio than marine phytoplankton 6.7:1 and has therefore been thought to be a carbon source in estuaries and coastal waters. Thus, a decrease in the riverine organic C:N ratio to <6.7:1 would potentially switch riverine organic matter from a coastal carbon source to sink. However, few studies have paid an attention to such a change. Our field investigation showed that organic C:N ratio was 11.8:1 in the pristine upstream section of a natural reserve, but decreased after the river passed through several urban cities, reaching 5.0:1 in near the Pearl River estuary. Along the river, dissolved inorganic nitrogen, total organic carbon and nitrogen all increased and they were highly negatively correlated with organic C:N ratios. The observation has a great implication that organic matter with a decreased C:N ratio from the Pearl River would potentially switch from a coastal carbon source of 2.8 × 1011 g C/year to a sink of 2.2 × 1011 g C/year. This carbon sink (2.2 × 1011 g C/year) contributes to 56% of the previous estimate of the Pearl River estuarine-coastal net carbon sink. Such a decrease in organic C:N ratio also occurs in some other large rivers, which should be considered in the assessment of global coastal carbon budgets and metabolic balance. © 2019 The Authors Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/158656
Appears in Collections: 气候变化与战略
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作者单位: School of Marine Sciences/Guangdong Key Laboratory of Marine Resources and Coastal Engineering, Sun Yat-Sen University, Guangzhou, 510275, China; Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai), Zhuhai, China; School of Marine Science and Policy, University of Delaware, Newark, DE 19716, United States; National Marine Environmental Monitoring Center, Ministry of Ecology and Environment, Dalian, 116023, China
Recommended Citation:
Liu Q.,Liang Y.,Cai W.-J.,et al. Changing riverine organic C:N ratios along the Pearl River: Implications for estuarine and coastal carbon cycles[J]. Science of the Total Environment,2020-01-01,709