DOI: 10.1111/gcb.12330
论文题名: Environmental controls of temporal and spatial variability in CO2 and CH4 fluxes in a neotropical peatland
作者: Wright E.L. ; Black C.R. ; Turner B.L. ; Sjögersten S.
刊名: Global Change Biology
ISSN: 13541013
出版年: 2013
卷: 19, 期: 12 起始页码: 3775
结束页码: 3789
语种: 英语
英文关键词: Carbon dioxide
; Methane
; Nutrient gradient
; Panama
; Peatland
; Tropical
Scopus关键词: carbon dioxide
; carbon flux
; diurnal variation
; methane
; Neotropical Region
; nutrient
; ombrotrophic environment
; peatland
; spatial variation
; temporal variation
; tropical environment
; vegetation
; Panama [Central America]
; Campnosperma
; Cyperus
; Raphia taedigera
; carbon dioxide
; methane
; article
; circadian rhythm
; metabolism
; nutrient gradient
; Panama
; peatland
; season
; Tropical
; wetland
; carbon dioxide
; methane
; nutrient gradient
; Panama
; peatland
; tropical
; Carbon Dioxide
; Circadian Rhythm
; Methane
; Panama
; Seasons
; Wetlands
英文摘要: Tropical peatlands play an important role in the global storage and cycling of carbon (C) but information on carbon dioxide (CO2) and methane (CH4) fluxes from these systems is sparse, particularly in the Neotropics. We quantified short and long-term temporal and small scale spatial variation in CO2 and CH4 fluxes from three contrasting vegetation communities in a domed ombrotrophic peatland in Panama. There was significant variation in CO2 fluxes among vegetation communities in the order Campnosperma panamensis > Raphia taedigera > Cyperus. There was no consistent variation among sites and no discernible seasonal pattern of CH4 flux despite the considerable range of values recorded (e.g. -1.0 to 12.6 mg m-2 h-1 in 2007). CO2 fluxes varied seasonally in 2007, being greatest in drier periods (300-400 mg m-2 h-1) and lowest during the wet period (60-132 mg m-2 h-1) while very high emissions were found during the 2009 wet period, suggesting that peak CO2 fluxes may occur following both low and high rainfall. In contrast, only weak relationships between CH4 flux and rainfall (positive at the C. panamensis site) and solar radiation (negative at the C. panamensis and Cyperus sites) was found. CO2 fluxes showed a diurnal pattern across sites and at the Cyperus sp. site CO2 and CH4 fluxes were positively correlated. The amount of dissolved carbon and nutrients were strong predictors of small scale within-site variability in gas release but the effect was site-specific. We conclude that (i) temporal variability in CO2 was greater than variation among vegetation communities; (ii) rainfall may be a good predictor of CO2 emissions from tropical peatlands but temporal variation in CH4 does not follow seasonal rainfall patterns; and (iii) diurnal variation in CO2 fluxes across different vegetation communities can be described by a Fourier model. © 2013 John Wiley & Sons Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/62264
Appears in Collections: 影响、适应和脆弱性
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作者单位: School of Biosciences, University of Nottingham, Nottingham, NG7 2RD, United Kingdom; Smithsonian Tropical Research Institute, Apartado 0843-03092, Balboa, Ancón, Panama
Recommended Citation:
Wright E.L.,Black C.R.,Turner B.L.,et al. Environmental controls of temporal and spatial variability in CO2 and CH4 fluxes in a neotropical peatland[J]. Global Change Biology,2013-01-01,19(12)