DOI: 10.1007/s10533-017-0312-2
Scopus记录号: 2-s2.0-85014988488
论文题名: Elevated CO2 and nitrogen addition accelerate net carbon gain in a brackish marsh
作者: Pastore M.A. ; Megonigal J.P. ; Langley J.A.
刊名: Biogeochemistry
ISSN: 0168-2563
EISSN: 1573-515X
出版年: 2017
卷: 133, 期: 1 起始页码: 73
结束页码: 87
语种: 英语
英文关键词: Carbon gain
; CO2 enrichment
; Greenhouse gases
; Methane
; Nitrogen pollution
; Nitrous oxide
Scopus关键词: brackish water
; carbon cycle
; carbon dioxide
; experimental study
; greenhouse gas
; marsh
; methane
; nitrogen
; nitrogen cycle
; nitrous oxide
; organic matter
; radiative forcing
; soil carbon
; wetland
英文摘要: Wetlands have an inordinate influence on the global greenhouse gas budget, but how global changes may alter wetland contribution to future greenhouse gas fluxes is poorly understood. We determined the greenhouse gas balance of a tidal marsh exposed to nine years of experimental carbon dioxide (CO2) and nitrogen (N) manipulation. We estimated net carbon (C) gain rates by measuring changes in plant and soil C pools over nine years. In wetland soils that accrete primarily through organic matter inputs, long-term measurements of soil elevation, along with soil C density, provide a robust estimate of net soil C gain. We used net soil C gain along with methane and nitrous oxide fluxes to determine the radiative forcing of the marsh under elevated CO2 and N addition. Nearly all plots exhibited a net gain of C over the study period (up to 203 g C m−2 year−1), and C gain rates were greater with N and CO2 addition. Treatment effects on C gain and methane emissions dominated trends in radiative forcing while nitrous oxide fluxes in all treatments were negligible. Though these soils experience salinities that typically suppress methane emissions, our results suggest that elevated CO2 can stimulate methane emissions, overcoming positive effects of elevated CO2 on C gain, converting brackish marshes that are typically net greenhouse gas sinks into sources. Adding resources, either CO2 or N, will likely increase “blue carbon” accumulation rates in tidal marshes, but importantly, each resource can have distinct influences on the direction of total greenhouse forcing. © 2017, Springer International Publishing Switzerland. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/83290
Appears in Collections: 气候减缓与适应 气候变化事实与影响
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作者单位: Department of Biology, Villanova University, 800 Lancaster Avenue, Villanova, PA, United States; Department of Ecology, Evolution, and Behavior, University of Minnesota, 1479 Gortner Ave., 140 Gortner Laboratory, St. Paul, MN, United States; Smithsonian Environmental Research Center, 647 Contees Wharf Road, Edgewater, MD, United States
Recommended Citation:
Pastore M.A.,Megonigal J.P.,Langley J.A.. Elevated CO2 and nitrogen addition accelerate net carbon gain in a brackish marsh[J]. Biogeochemistry,2017-01-01,133(1)