Lateral expansion and carbon exchange of a boreal peatland in Finland resulting in 7000 years of positive radiative forcing

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http://hdl.handle.net/10138/224230

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Mathijssen , P J H , Kahkola , N , Tuovinen , J-P , Lohila , A , Minkkinen , K , Laurila , T & Väliranta , M 2017 , ' Lateral expansion and carbon exchange of a boreal peatland in Finland resulting in 7000 years of positive radiative forcing ' , Journal of Geophysical Research : Biogeosciences , vol. 122 , no. 3 , pp. 562-577 . https://doi.org/10.1002/2016JG003749

Title: Lateral expansion and carbon exchange of a boreal peatland in Finland resulting in 7000 years of positive radiative forcing
Author: Mathijssen, Paul J. H.; Kahkola, Noora; Tuovinen, Juha-Pekka; Lohila, Annalea; Minkkinen, Kari; Laurila, Tuomas; Väliranta, Minna
Contributor: University of Helsinki, Environmental Sciences
University of Helsinki, Department of Forest Sciences
University of Helsinki, Environmental Sciences
Date: 2017-03
Language: eng
Number of pages: 16
Belongs to series: Journal of Geophysical Research : Biogeosciences
ISSN: 2169-8953
URI: http://hdl.handle.net/10138/224230
Abstract: Data on past peatland growth patterns, vegetation development, and carbon (C) dynamics during the various Holocene climate phases may help us to understand possible future climate-peatland feedback mechanisms. In this study, we analyzed and radiocarbon dated several peat cores from Kalevansuo, a drained bog in southern Finland. We investigated peatland succession and C dynamics throughout the Holocene. These data were used to reconstruct the long-term atmospheric radiative forcing, i.e., climate impact of the peatland since initiation. Kalevansuo peat records revealed a general development from fen to bog, typical for the southern boreal zone, but the timing of ombrotrophication varied in different parts of the peatland. Peat accumulation patterns and lateral expansion through paludification were influenced by fires and climate conditions. Long-term C accumulation rates were overall lower than the average values found from literature. We suggest the low accumulation rates are due to repeated burning of the peat surface. Drainage for forestry resulted in a nearly complete replacement of typical bog mosses by forest species within 40 years after drainage. The radiative forcing reconstruction suggested positive values ( warming) for the first similar to 7000 years following initiation. The change from positive to negative forcing was triggered by an expansion of bog vegetation cover and later by drainage. The strong relationship between peatland area and peat type with radiative forcing suggests a possible feedback for future changing climate, as high-latitude peatlands may experience prominent regime shifts, such as fen to bog transitions.
Subject: GREENHOUSE-GAS FLUXES
WATER-LEVEL DRAWDOWN
DRAINED PINE MIRES
NORTHERN PEATLAND
SOUTHERN FINLAND
CLIMATE-CHANGE
VEGETATION SUCCESSION
ACCUMULATION RATES
FINNISH LAPLAND
HOLOCENE CARBON
1172 Environmental sciences
1171 Geosciences
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