DOI: 10.1016/j.earscirev.2021.103658
论文题名: Biogeochemical cycling of iron (hydr-)oxides and its impact on organic carbon turnover in coastal wetlands: A global synthesis and perspective
作者: Yu C. ; Xie S. ; Song Z. ; Xia S. ; Åström M.E.
刊名: Earth Science Reviews
ISSN: 00128252
出版年: 2021
卷: 218 语种: 英语
中文关键词: Anaerobic carbon oxidation
; Carbon turnover
; Climate change
; Coastal wetland
; Dissimilatory Fe reduction
; Iron (hydr-)oxides
; Iron plaque
; Radial oxygen loss
; Sea-level rise
英文关键词: anoxic conditions
; biogeochemical cycle
; carbon cycle
; climate change
; coastal wetland
; iron
; methanogenesis
; organic carbon
; oxidation
; reaction kinetics
; reduction
; sea level change
英文摘要: Coastal wetlands host large and dynamic reservoirs of organic carbon (C) and are also biogeochemical hotspots for a wide range of Fe (hydr-)oxides with different chemical reactivities, properties, and functions. The cycling of these iron (hydr-)oxides is closely coupled to that of organic C, which in turn strongly influences the magnitude and dynamics of organic C turnover in these ecosystems. This review synthesizes and summarizes current knowledge of distribution, turnover, and controls of Fe (hydr-)oxides, as well as their ecological roles and impacts on organic C turnover in coastal wetland ecosystems globally. Regional hydro-geochemical processes and anthropogenic activities in the uplands as well as soil texture exert a first-order control on the abundance and distribution of Fe (hydr-)oxides in coastal wetland soils, while the activities of plant roots and macro-organisms act as important biological drivers for the formation, transformation, and turnover of Fe (hydr-)oxides as well as associated organic C in both rhizosphere/burrows and bulk soils. The reported rates of dissimilatory Fe reduction (DFeR) are correlated with incubation temperature and the sizes of reactive Fe(III) phases. However, the contributions of DFeR to total anaerobic carbon oxidation were found to be correlated only with the size of reactive Fe(III) pools, meaning that all the identified processes contributing to the accumulation and formation of Fe hydroxides could increase the importance of the DFeR-dominated respiratory pathway and suppress sulfate reduction and methanogenesis. Additionally, Fe plaques dominated by amorphous Fe hydroxides are formed and cycled in close interaction with the activities of wetland plant roots, and likely provide several important ecological functions and contribute to maintaining high levels of plant productivity in coastal wetlands under different environmental stresses. The features and findings presented in this review not only contribute to an improved understanding of the biogeochemical cycle and ecological roles of Fe (hydr-)oxides in coastal wetlands, but also provide a basis for future studies on some highlighted key research areas. Such future studies will further increase our ability to understand and predict how the size, stability, and turnover of Fe (hydr-)oxides and organic C in coastal wetlands will respond to and affect global climate change. © 2021 The Author(s) Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/166544
Appears in Collections: 气候变化与战略
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作者单位: Department of Biology and Environmental Science, Linnaeus UniversityKalmar 39231, Sweden; School of Earth Sciences, East China University of Technology, Nanchang, 330013, China; Faculty of Resource and Environment Science, Hunan Normal University, Changsha, 410081, China; Institute of Surface-Earth System Science, Tianjin University, Tianjin, 300072, China; Tianjin Key Laboratory of Earth Critical Zone Science and Sustainable Development in Bohai Rim, Tianjin University, Tianjin, 300072, China
Recommended Citation:
Yu C.,Xie S.,Song Z.,et al. Biogeochemical cycling of iron (hydr-)oxides and its impact on organic carbon turnover in coastal wetlands: A global synthesis and perspective[J]. Earth Science Reviews,2021-01-01,218