University of Oulu

Laine, A., Mehtätalo, L., Tolvanen, A., Frolking, S., Tuittila, E. (2019) Impacts of drainage, restoration and warming on boreal wetland greenhouse gas fluxes. Science of the Total Environment, 647, 169-181. doi:10.1016/j.scitotenv.2018.07.390

Impacts of drainage, restoration and warming on boreal wetland greenhouse gas fluxes

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Author: Laine, A.M.1,2,3; Mehtätalo, L.4; Tolvanen, A.2,5;
Organizations: 1Department of Forest Science, University of Helsinki
2Department of Ecology and Genetics, University of Oulu
3School of Forest Sciences, University of Eastern Finland
4School of Computing, University of Eastern Finland
5Natural Resources Institute Finland (Luke)
6Institute for the Study of Earth, Oceans, and Space, University of New Hampshire
Format: article
Version: accepted version
Access: embargoed
Persistent link: http://urn.fi/urn:nbn:fi-fe2019032910501
Language: English
Published: Elsevier, 2019
Publish Date: 2020-07-31
Description:

Abstract

Northern wetlands with organic soil i.e., mires are significant carbon storages. This key ecosystem service may be threatened by anthropogenic activities and climate change, yet we still lack a consensus on how these major changes affects their carbon sink capacities. We studied how forestry drainage and restoration combined with experimental warming, impacts greenhouse gas fluxes of wetlands with peat. We measured CO₂ and CH₄ during two and N₂O fluxes during one growing season using the chamber method.

Gas fluxes were primarily controlled by water table, leaf area and temperature. Land use had a clear impact of on CO₂ exchange. Forestry drainage increased respiration rates and decreased field layer net ecosystem CO₂ uptake (NEE) and leaf area index (LAI), while at restoration sites the flux rates and LAI had recovered to the level of undrained sites. CH₄ emissions were exceptionally low at all sites during our study years due to natural drought, but still somewhat lower at drained compared to undrained sites. Moderate warming triggered an increase in LAI across all land use types. This was accompanied by an increase in cumulative seasonal NEE. Restoration appeared to be an effective tool to return the ecosystem functions of these wetlands as we found no differences in LAI or any gas flux components (PMAX, Reco, NEE, CH₄ or N₂O) between restored and undrained sites. We did not find any signs that moderate warming would compromise the return of the ecosystem functions related to C sequestration.

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Series: Science of the total environment
ISSN: 0048-9697
ISSN-E: 1879-1026
ISSN-L: 0048-9697
Volume: 647
Pages: 169 - 181
DOI: 10.1016/j.scitotenv.2018.07.390
OADOI: https://oadoi.org/10.1016/j.scitotenv.2018.07.390
Type of Publication: A1 Journal article – refereed
Field of Science: 1172 Environmental sciences
1181 Ecology, evolutionary biology
Subjects:
Funding: We acknowledge funding from the University of Helsinki and Kone foundation (A. M. Laine), the Natural Resources Institute Finland (A. Tolvanen), the Fulbright-Finland and Saastamoinen Foundations (S. Frolking), and the Academy of Finland (project code 287039) (E.-S. Tuittila).
Copyright information: © 2018. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http:/creativecommons.org/licenses/by-nc-nd/4.0/
  https://creativecommons.org/licenses/by-nc-nd/4.0/