DOI: 10.1007/s10533-016-0253-1
Scopus记录号: 2-s2.0-84990978793
论文题名: Greenhouse trace gases in deadwood
作者: Covey K.R. ; de Mesquita C.P.B. ; Oberle B. ; Maynard D.S. ; Bettigole C. ; Crowther T.W. ; Duguid M.C. ; Steven B. ; Zanne A.E. ; Lapin M. ; Ashton M.S. ; Oliver C.D. ; Lee X. ; Bradford M.A.
刊名: Biogeochemistry
ISSN: 0168-2563
EISSN: 1573-515X
出版年: 2016
卷: 130, 期: 3 起始页码: 215
结束页码: 226
语种: 英语
英文关键词: Climate change
; Decomposition
; Methane
; Methanogenesis
; Nitrous oxide
; Nonstructural carbohydrates
; Trace gases
; woody debris
Scopus关键词: carbohydrate
; carbon dioxide
; carbon dioxide enrichment
; carbon sequestration
; concentration (composition)
; dead wood
; decomposition
; forest ecosystem
; greenhouse gas
; methane
; methanogenesis
; nitrous oxide
; oxygen
; trace gas
; woody debris
; United States
英文摘要: Deadwood, long recognized as playing an important role in storing carbon and releasing it as CO2 in forest ecosystems, is more recently drawing attention for its potential role in the cycling of other greenhouse trace gases. Across three Northeastern and Central US forests, mean methane (CH4) concentrations in deadwood were 23 times atmospheric levels (43.0 μL L−1 ± 12.3; mean ± SE), indicating a lower bound, mean radial wood surface area flux of ~6 × 10−4 μmol CH4 m−2 s−1. Site, decay class, log diameter, and species were all highly significant predictors of CH4 abundance in deadwood, and diameter and decay class interacted as important controls limiting CH4 concentrations in the smallest and most decayed logs. Nitrous oxide (N2O) concentrations were negatively correlated with CH4 (r2 = −0.20, p < 0.001) and on average ~25 % lower than ambient (276.9 nL L−1 ± 2.9; mean ± SE), indicating net consumption of nitrous oxide. Oxygen (O2) concentrations were uniformly near anaerobic (355.8 μL L−1 ±1.2; mean ± SE), and CO2 was elevated from atmospheric (9336.9 μL L−1 ± 600.6; mean ± SE). Most notably, our observations that CH4 concentrations were highest in the least decayed wood, may suggest that methanogenesis is not fuelled by structural wood decomposition but rather by consumption of more labile nonstructural carbohydrates. © 2016, Springer International Publishing Switzerland. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/83348
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: Yale School of Forestry and Environmental Studies, Yale University, 370 Prospect St., New Haven, CT, United States; Program in Environmental Studies, Middlebury College, Middlebury, VT, United States; Division of Natural Sciences, New College of Florida, 5800 Bay Shore Road, Sarasota, FL, United States; Connecticut Agricultural Experiment Station, New Haven, CT, United States; Department of Environmental Sciences, George Washington University, Washington, DC, United States
Recommended Citation:
Covey K.R.,de Mesquita C.P.B.,Oberle B.,et al. Greenhouse trace gases in deadwood[J]. Biogeochemistry,2016-01-01,130(3)