Warming impacts on boreal fen CO2 exchange under wet and dry conditions

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Laine , A M , Mäkiranta , P , Laiho , R , Mehtätalo , L , Penttilä , T , Korrensalo , A , Minkkinen , K , Fritze , H & Tuittila , E-S 2019 , ' Warming impacts on boreal fen CO2 exchange under wet and dry conditions ' , Global Change Biology , vol. 25 , no. 6 , pp. 1995-2008 . https://doi.org/10.1111/gcb.14617

Title: Warming impacts on boreal fen CO2 exchange under wet and dry conditions
Author: Laine, A.M.; Mäkiranta, P.; Laiho, R.; Mehtätalo, L.; Penttilä, T.; Korrensalo, A.; Minkkinen, K.; Fritze, H.; Tuittila, E-S
Contributor organization: Department of Forest Sciences
Kari Minkkinen / Principal Investigator
Forest Ecology and Management
Date: 2019-06
Language: eng
Number of pages: 14
Belongs to series: Global Change Biology
ISSN: 1354-1013
DOI: https://doi.org/10.1111/gcb.14617
URI: http://hdl.handle.net/10138/313134
Abstract: Abstract Northern peatlands form a major soil carbon (C) stock. With climate change, peatland C mineralization is expected to increase, which in turn would accelerate climate change. A particularity of peatlands is the importance of soil aeration, which regulates peatland functioning and likely modulates the responses to warming climate. Our aim is to assess the impacts of warming on a southern boreal and a sub-arctic sedge fen carbon dioxide (CO2) exchange under two plausible water table regimes: wet and moderately dry. We focused this study on minerotrophic treeless sedge fens, as they are common peatland types at boreal and (sub)arctic areas, which are expected to face the highest rates of climate warming. In addition, fens are expected to respond to environmental changes faster than the nutrient poor bogs. Our study confirmed that CO2 exchange is more strongly affected by drying than warming. Experimental water level draw-down (WLD) significantly increased gross photosynthesis and ecosystem respiration. Warming alone had insignificant impacts on the CO2 exchange components, but when combined with WLD it further increased ecosystem respiration. In the southern fen, CO2 uptake decreased due to WLD, which was amplified by warming, while at northern fen it remained stable. As a conclusion, our results suggest that a very small difference in the WLD may be decisive, whether the C sink of a fen decreases, or whether the system is able to adapt within its regime and maintain its functions. Moreover, the water table has a role in determining how much the increased temperature impacts the CO2 exchange. This article is protected by copyright. All rights reserved.
Subject: 1172 Environmental sciences
4112 Forestry
carbon dioxide
ecosystem respiration
gross photosynthesis
water level drawdown
Peer reviewed: Yes
Rights: unspecified
Usage restriction: openAccess
Self-archived version: acceptedVersion

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