DOI: 10.1029/2017JG004369
Scopus记录号: 2-s2.0-85049859168
论文题名: Flooding Alters Plant-Mediated Carbon Cycling Independently of Elevated Atmospheric CO2 Concentrations
作者: Jones S.F. ; Stagg C.L. ; Krauss K.W. ; Hester M.W.
刊名: Journal of Geophysical Research: Biogeosciences
ISSN: 21698953
出版年: 2018
卷: 123, 期: 6 起始页码: 1976
结束页码: 1987
语种: 英语
Scopus关键词: aboveground biomass
; C4 plant
; carbon cycle
; carbon dioxide
; carbon sequestration
; climate change
; concentration (composition)
; decomposition
; depth
; flooding
; hydrological regime
; plant community
; saltmarsh
; Louisiana
; United States
英文摘要: Plant-mediated processes determine carbon (C) cycling and storage in many ecosystems; how plant-associated processes may be altered by climate-induced changes in environmental drivers is therefore an essential question for understanding global C cycling. In this study, we hypothesize that environmental alterations associated with near-term climate change can exert strong control on plant-associated ecosystem C cycling and that investigations along an extended hydrologic gradient may give mechanistic insight into C cycling. We utilize a mesocosm approach to investigate the response of plant, soil, and gaseous C cycling to changing hydrologic regimes and elevated atmospheric carbon dioxide (CO2) concentrations expected by 2100 in a coastal salt marsh in Louisiana, USA. Although elevated CO2 had no significant effects on C cycling, we demonstrate that greater average flooding depth stimulated C exchange, with higher rates of labile C decomposition, plant CO2 assimilation, and soil C respiration. Greater average flooding depth also significantly decreased the soil C pool and marginally increased the aboveground biomass C pool, leading to net losses in total C stocks. Further, flooding depths along an extended hydrologic gradient garnered insight into decomposition mechanisms that was not apparent from other data. In C-4 dominated salt marshes, sea level rise will likely overwhelm effects of elevated CO2 with climate change. Deeper flooding associated with sea level rise may decrease long-term soil C pools and quicken C exchange between soil and atmosphere, thereby threatening net C storage in salt marsh habitats. Manipulative studies will be indispensable for understanding biogeochemical cycling under future conditions. ©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/113741
Appears in Collections: 气候减缓与适应
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作者单位: Coastal Plant Ecology Lab, Department of Biology, University of Louisiana at Lafayette, Lafayette, LA, United States; DeFelice Marine Center, Louisiana Universities Marine Consortium, Chauvin, LA, United States; Wetland and Aquatic Research Center, U.S. Geological Survey, Lafayette, LA, United States
Recommended Citation:
Jones S.F.,Stagg C.L.,Krauss K.W.,et al. Flooding Alters Plant-Mediated Carbon Cycling Independently of Elevated Atmospheric CO2 Concentrations[J]. Journal of Geophysical Research: Biogeosciences,2018-01-01,123(6)