DOI: 10.1111/gcb.14498
Scopus记录号: 2-s2.0-85056485756
论文题名: Tree stem bases are sources of CH4 and N2O in a tropical forest on upland soil during the dry to wet season transition
作者: Welch B. ; Gauci V. ; Sayer E.J.
刊名: Global Change Biology
ISSN: 13541013
出版年: 2019
卷: 25, 期: 1 起始页码: 361
结束页码: 372
语种: 英语
英文关键词: leaf litter
; methane
; nitrous oxide
; soil
; trace greenhouse gases
; tree stem emissions
; upland tropical forest
Scopus关键词: dry season
; greenhouse gas
; leaf litter
; methane
; nitrous oxide
; stem
; trace gas
; tropical forest
; upland region
; wet season
; methane
; nitrous oxide
; rain
; greenhouse gas
; metabolism
; Panama
; plant stem
; season
; tree
; tropic climate
; Greenhouse Gases
; Methane
; Nitrous Oxide
; Panama
; Plant Stems
; Rain
; Seasons
; Trees
; Tropical Climate
英文摘要: Tropical forests on upland soils are assumed to be a methane (CH4) sink and a weak source of nitrous oxide (N2O), but studies of wetland forests have demonstrated that tree stems can be a substantial source of CH4, and recent evidence from temperate woodlands suggests that tree stems can also emit N2O. Here, we measured CH4 and N2O fluxes from the soil and from tree stems in a semi-evergreen tropical forest on upland soil. To examine the influence of seasonality, soil abiotic conditions and substrate availability (litter inputs) on trace greenhouse gas (GHG) fluxes, we conducted our study during the transition from the dry to the wet season in a long-term litter manipulation experiment in Panama, Central America. Trace GHG fluxes were measured from individual stem bases of two common tree species and from soils beneath the same trees. Soil CH4 fluxes varied from uptake in the dry season to minor emissions in the wet season. Soil N2O fluxes were negligible during the dry season but increased markedly after the start of the wet season. By contrast, tree stem bases emitted CH4 and N2O throughout the study. Although we observed no clear effect of litter manipulation on trace GHG fluxes, tree species and litter treatments interacted to influence CH4 fluxes from stems and N2O fluxes from stems and soil, indicating complex relationships between tree species traits and decomposition processes that can influence trace GHG dynamics. Collectively, our results show that tropical trees can act as conduits for trace GHGs that most likely originate from deeper soil horizons, even when they are growing on upland soils. Coupled with the finding that the soils may be a weaker sink for CH4 than previously thought, our research highlights the need to reappraise trace gas budgets in tropical forests. © 2018 John Wiley & Sons Ltd Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/117557
Appears in Collections: 气候变化与战略
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Recommended Citation:
Welch B.,Gauci V.,Sayer E.J.. Tree stem bases are sources of CH4 and N2O in a tropical forest on upland soil during the dry to wet season transition[J]. Global Change Biology,2019-01-01,25(1)