DOI: 10.1002/2015GL067388
论文题名: Enhanced terrestrial carbon preservation promoted by reactive iron in deltaic sediments
作者: Shields M.R. ; Bianchi T.S. ; Gélinas Y. ; Allison M.A. ; Twilley R.R.
刊名: Geophysical Research Letters
ISSN: 0094-9400
EISSN: 1944-9131
出版年: 2016
卷: 43, 期: 3 起始页码: 1149
结束页码: 1157
语种: 英语
英文关键词: carbon preservation
; iron
; lignin
; organic carbon
; river deltas
Scopus关键词: Binding sites
; Bins
; Coastal zones
; Coprecipitation
; Iron
; Lignin
; Organic carbon
; Binding mechanisms
; C values
; Chronosequences
; Lignin phenols
; Mississippi river
; Preferential binding
; River deltas
; Iron compounds
; adsorption
; delta
; deltaic sedimentation
; iron
; lignin
; organic carbon
; phenol
; precipitation (chemistry)
; preservation
; sediment chemistry
; terrestrial environment
; Atchafalaya Delta
; Louisiana
; Mississippi River
; United States
; Wax Lake Delta
英文摘要: We examined the role of reactive iron (FeR) in preserving organic carbon (OC) across a subaerial chronosequence of the Wax Lake Delta, a prograding delta within the Mississippi River Delta complex. We found that ∼15.0% of the OC was bound to FeR, and the dominant binding mechanisms varied from adsorption in the youngest subaerial region to coprecipitation at the older, vegetated sites. The δ13C of the iron-associated OC was more negative than the total OC (mean = -2.6‰), indicating greater preference for terrestrial material and/or compounds with more negative δ13C values. However, only the adsorbed OC displayed preferential binding of lignin phenols. We estimate that ∼8% of the OC initially deposited in deltaic systems is bound to FeR (equivalent to 6 × 1012 gC yr-1), and this percentage increases postdepositionally, as coprecipitation of FeR and OC allows for an even greater amount of OC to be bound to FeR. © 2016. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84976251275&doi=10.1002%2f2015GL067388&partnerID=40&md5=5626fbe8114ed2c232fb04a6a770d34e
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/10363
Appears in Collections: 科学计划与规划 气候变化与战略
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作者单位: Department of Geological Sciences, University of Florida, Gainesville, FL, United States
Recommended Citation:
Shields M.R.,Bianchi T.S.,Gélinas Y.,et al. Enhanced terrestrial carbon preservation promoted by reactive iron in deltaic sediments[J]. Geophysical Research Letters,2016-01-01,43(3).