DOI: 10.1007/s10533-014-9974-1
Scopus记录号: 2-s2.0-84900792403
论文题名: The role of vegetation in methane flux to the atmosphere: Should vegetation be included as a distinct category in the global methane budget?
作者: Carmichael M.J. ; Bernhardt E.S. ; Bräuer S.L. ; Smith W.K.
刊名: Biogeochemistry
ISSN: 0168-2563
EISSN: 1573-515X
出版年: 2014
卷: 119, 期: 2018-01-03 起始页码: 1
结束页码: 24
语种: 英语
英文关键词: Biogeochemistry
; C cycle
; Methane
; Vegetation
Scopus关键词: anthropogenic effect
; biogeochemistry
; carbon cycle
; coarse woody debris
; global change
; litter
; methane
; oxic conditions
; vegetation dynamics
; wetland
英文摘要: Currently, the global annual flux of methane (CH4) to the atmosphere is fairly well constrained at ca. 645 Tg CH4 year-1. However, the relative magnitudes of the fluxes generated from different natural (e.g. wetlands, deep seepage, hydrates, ocean sediments) and anthropogenic sources remain poorly resolved. Of the identified natural sources, the contribution of vegetation to the global methane budget is arguably the least well understood. Historically, reviews of the contribution of vegetation to the global methane flux have focused on the role of plants as conduits for soil-borne methane emissions from wetlands, or the aerobic production of methane within plant tissues. Many recent global budgets only include the latter pathway (aerobic methane production) in estimating the importance of terrestrial vegetation to atmospheric CH4 flux. However, recent experimental evidence suggests several novel pathways through which vegetation can contribute to the flux of this globally important, trace greenhouse gas (GHG), such as plant cisterns that act as cryptic wetlands, heartwood rot in trees, the degradation of coarse woody debris and litter, or methane transport through herbaceous and woody plants. Herein, we synthesize the existing literature to provide a comprehensive estimate of the role of modern vegetation in the global methane budget. This first, albeit uncertain, estimate indicates that vegetation may represent up to 22 % of the annual flux of methane to the atmosphere, contributing ca. 32-143 Tg CH4 year-1 to the global flux of this important trace GHG. Overall, our findings emphasize the need to better resolve the role of vegetation in the biogeochemical cycling of methane as an important component of closing the gap in the global methane budget. © 2014 Springer International Publishing Switzerland. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/83630
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, Wake Forest University, Winston-Salem, NC, 27109, United States; Department of Biology, Duke University, Durham, NC, 27708, United States; Department of Biology, Appalachian State University, Boone, NC, 28608, United States
Recommended Citation:
Carmichael M.J.,Bernhardt E.S.,Bräuer S.L.,et al. The role of vegetation in methane flux to the atmosphere: Should vegetation be included as a distinct category in the global methane budget?[J]. Biogeochemistry,2014-01-01,119(2018-01-03)