DOI: 10.1111/gcb.12209
论文题名: Temperature and precipitation drive temporal variability in aquatic carbon and GHG concentrations and fluxes in a peatland catchment
作者: Dinsmore K.J. ; Billett M.F. ; Dyson K.E.
刊名: Global Change Biology
ISSN: 13541013
出版年: 2013
卷: 19, 期: 7 起始页码: 2133
结束页码: 2148
语种: 英语
英文关键词: Aquatic carbon
; Aquatic export
; CO2
; DOC
; Evasion
; Greenhouse gases
; Peatland
; POC
; Temporal variability
Scopus关键词: carbon
; fresh water
; atmosphere-biosphere interaction
; carbon dioxide
; carbon sequestration
; catchment
; climate change
; concentration (composition)
; dissolved inorganic carbon
; greenhouse gas
; methane
; nitrogen dioxide
; ombrotrophic environment
; organic carbon
; peatland
; precipitation assessment
; seasonal variation
; temperature effect
; article
; carbon cycle
; chemistry
; greenhouse effect
; growth, development and aging
; phylogeography
; Poaceae
; soil
; temperature
; United Kingdom
; water flow
; Carbon
; Carbon Cycle
; Fresh Water
; Greenhouse Effect
; Phylogeography
; Poaceae
; Scotland
; Soil
; Temperature
; Water Movements
; Scotland
; United Kingdom
英文摘要: The aquatic pathway is increasingly being recognized as an important component of catchment carbon and greenhouse gas (GHG) budgets, particularly in peatland systems due to their large carbon store and strong hydrological connectivity. In this study, we present a complete 5-year data set of all aquatic carbon and GHG species from an ombrotrophic Scottish peatland. Measured species include particulate and dissolved forms of organic carbon (POC, DOC), dissolved inorganic carbon (DIC), CO2, CH4 and N2O. We show that short-term variability in concentrations exists across all species and this is strongly linked to discharge. Seasonal cyclicity was only evident in DOC, CO2 and CH4 concentration; however, temperature correlated with monthly means in all species except DIC. Although the temperature correlation with monthly DOC and POC concentrations appeared to be related to biological productivity in the terrestrial system, we suggest the temperature correlation with CO2 and CH4 was primarily due to in-stream temperature-dependent solubility. Interannual variability in total aquatic carbon concentration was strongly correlated with catchment gross primary productivity (GPP) indicating a strong potential terrestrial aquatic linkage. DOC represented the largest aquatic carbon flux term (19.3 ± 4.59 g C m-2 yr-1), followed by CO2 evasion (10.0 g C m-2 yr-1). Despite an estimated contribution to the total aquatic carbon flux of between 8 and 48%, evasion estimates had the greatest uncertainty. Interannual variability in total aquatic carbon export was low in comparison with variability in terrestrial biosphere-atmosphere exchange, and could be explained primarily by temperature and precipitation. Our results therefore suggest that climatic change is likely to have a significant impact on annual carbon losses through the aquatic pathway, and as such, aquatic exports are fundamental to the understanding of whole catchment responses to climate change. © 2013 Blackwell Publishing Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/62394
Appears in Collections: 影响、适应和脆弱性
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作者单位: Centre for Ecology and Hydrology, Bush Estate, Penicuik, EH26 0QB, United Kingdom
Recommended Citation:
Dinsmore K.J.,Billett M.F.,Dyson K.E.. Temperature and precipitation drive temporal variability in aquatic carbon and GHG concentrations and fluxes in a peatland catchment[J]. Global Change Biology,2013-01-01,19(7)