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Impacts of drainage, restoration and warming on boreal wetland greenhouse gas fluxes
- Source :
- Science of The Total Environment. 647:169-181
- Publication Year :
- 2019
- Publisher :
- Elsevier BV, 2019.
-
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. (C) 2018 Elsevier B.V. All rights reserved.
- Subjects :
- Environmental Engineering
Peat
Peatland
010504 meteorology & atmospheric sciences
CUT-AWAY PEATLAND
WATER-TABLE-LEVEL
NORTHERN PEATLAND
Wetland
010501 environmental sciences
Carbon sequestration
Greenhouse gas
01 natural sciences
Open top chamber
METHANE EMISSIONS
Environmental Chemistry
Ecosystem
Leaf area index
VEGETATION COMPOSITION
Waste Management and Disposal
Restoration ecology
1172 Environmental sciences
0105 earth and related environmental sciences
TEMPERATE PEATLAND
Hydrology
4112 Forestry
geography
geography.geographical_feature_category
BIOMASS EQUATIONS
Carbon sink
15. Life on land
Pollution
CARBON BALANCE
Forestry drainage
13. Climate action
Restoration
Land use
Environmental science
INTERANNUAL VARIABILITY
SOUTHERN FINLAND
Subjects
Details
- ISSN :
- 00489697
- Volume :
- 647
- Database :
- OpenAIRE
- Journal :
- Science of The Total Environment
- Accession number :
- edsair.doi.dedup.....1f07d4e4750591cede904fa1e1dd9588
- Full Text :
- https://doi.org/10.1016/j.scitotenv.2018.07.390