Hydrology-driven ecosystem respiration determines the carbon balance of a boreal peatland Journal Article


Authors: Gazovic, Michal; Forbrich, Inke; Jager, Daniel F.; Kutzbach, Lars; Wille, Christian; Wilmking, Martin
Article Title: Hydrology-driven ecosystem respiration determines the carbon balance of a boreal peatland
Abstract: The carbon (C) balance of boreal peatlands is mainly the sum of three different C fluxes: carbon dioxide (CO2), methane (CH4) and dissolved organic carbon (DOC). lntra- and inter-annual dynamics of these fluxes are differentially controlled by similar factors, such as temperature and water-table. Different climatic conditions within and between years might thus result in varying absolute and relative contributions of each flux to net ecosystem productivity (NEP). In this study CO2 fluxes were measured at a boreal peatland in eastern Finland during a dry year (2006) and a wet year (2007) and combined with DOC and CH4 fluxes from the same site. CO2 uptake in the wet year was 65% higher than in the dry year, caused by higher water table (WT) and subsequently reduced rates of soil respiration. Two to three-fold increases in DOC and CH4 fluxes in the wet year did not completely offset the higher CO2 uptake in that year, resulting in NEP of -83.7 +/- 14 g C M-2 in the dry and 134.5 +/- 21 g C 111(-2) in the wet year. Thus, in our study, WT was identified as the most important factor responsible for variations in the C balance between the observed years. (C) 2013 Elsevier By. All rights reserved.
Keywords: EXCHANGE; TERRESTRIAL ECOSYSTEMS; DIOXIDE; CLIMATE-CHANGE; DISSOLVED ORGANIC-CARBON; METHANE; FLUXES; WATER-TABLE; EMISSIONS; Eddy covariance; carbon cycling; Environmental Sciences Ecology; Inter-annual variations; NORTHERN PEATLAND; FEN
Journal Title: Science of the Total Environment
Volume: 463
ISSN: 0048-9697
Publisher: Elsevier  
Publication Place: AMSTERDAM; PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS
Date Published: 2013
Start Page: 675
End Page: 682
Language: English
DOI/URL:
Notes: PT: J; NR: 48; TC: 0; J9: SCI TOTAL ENVIRON; PG: 8; GA: 236WW; UT: WOS:000325831200076