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Multiyear greenhouse gas balances at a rewetted temperate peatland.
Glob Chang Biol 2016; 22(12):4080-4095GC

Abstract

Drained peat soils are a significant source of greenhouse gas (GHG) emissions to the atmosphere. Rewetting these soils is considered an important climate change mitigation tool to reduce emissions and create suitable conditions for carbon sequestration. Long-term monitoring is essential to capture interannual variations in GHG emissions and associated environmental variables and to reduce the uncertainty linked with GHG emission factor calculations. In this study, we present GHG balances: carbon dioxide (CO2), methane (CH4) and nitrous oxide (N2 O) calculated for a 5-year period at a rewetted industrial cutaway peatland in Ireland (rewetted 7 years prior to the start of the study); and compare the results with an adjacent drained area (2-year data set), and with ten long-term data sets from intact (i.e. undrained) peatlands in temperate and boreal regions. In the rewetted site, CO2 exchange (or net ecosystem exchange (NEE)) was strongly influenced by ecosystem respiration (Reco) rather than gross primary production (GPP). CH4 emissions were related to soil temperature and either water table level or plant biomass. N2 O emissions were not detected in either drained or rewetted sites. Rewetting reduced CO2 emissions in unvegetated areas by approximately 50%. When upscaled to the ecosystem level, the emission factors (calculated as 5-year mean of annual balances) for the rewetted site were (±SD) -104 ± 80 g CO2 -C m-2 yr-1 (i.e. CO2 sink) and 9 ± 2 g CH4 -C m-2 yr-1 (i.e. CH4 source). Nearly a decade after rewetting, the GHG balance (100-year global warming potential) had reduced noticeably (i.e. less warming) in comparison with the drained site but was still higher than comparative intact sites. Our results indicate that rewetted sites may be more sensitive to interannual changes in weather conditions than their more resilient intact counterparts and may switch from an annual CO2 sink to a source if triggered by slightly drier conditions.

Authors+Show Affiliations

Earthy Matters Environmental Consultants, Glenvar, Co. Donegal, F92 HX03, Ireland.Bord na Móna, Tullamore, Co. Offaly, Ireland.Bord na Móna, Tullamore, Co. Offaly, Ireland.Justus Liebig University Giessen, Ludwigstraβe 23, 35390, Giessen, Germany.Justus Liebig University Giessen, Ludwigstraβe 23, 35390, Giessen, Germany. University College Dublin, Belfield, Dublin 4, D04 V1W8, Ireland.University College Dublin, Belfield, Dublin 4, D04 V1W8, Ireland.

Pub Type(s)

Journal Article

Language

eng

PubMed ID

27099183

Citation

Wilson, David, et al. "Multiyear Greenhouse Gas Balances at a Rewetted Temperate Peatland." Global Change Biology, vol. 22, no. 12, 2016, pp. 4080-4095.
Wilson D, Farrell CA, Fallon D, et al. Multiyear greenhouse gas balances at a rewetted temperate peatland. Glob Chang Biol. 2016;22(12):4080-4095.
Wilson, D., Farrell, C. A., Fallon, D., Moser, G., Müller, C., & Renou-Wilson, F. (2016). Multiyear greenhouse gas balances at a rewetted temperate peatland. Global Change Biology, 22(12), pp. 4080-4095. doi:10.1111/gcb.13325.
Wilson D, et al. Multiyear Greenhouse Gas Balances at a Rewetted Temperate Peatland. Glob Chang Biol. 2016;22(12):4080-4095. PubMed PMID: 27099183.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Multiyear greenhouse gas balances at a rewetted temperate peatland. AU - Wilson,David, AU - Farrell,Catherine A, AU - Fallon,David, AU - Moser,Gerald, AU - Müller,Christoph, AU - Renou-Wilson,Florence, Y1 - 2016/05/14/ PY - 2016/02/23/received PY - 2016/04/14/accepted PY - 2016/4/22/pubmed PY - 2017/8/3/medline PY - 2016/4/22/entrez KW - carbon dioxide KW - climate change mitigation KW - interannual variation KW - methane KW - peat soils KW - rewetting SP - 4080 EP - 4095 JF - Global change biology JO - Glob Chang Biol VL - 22 IS - 12 N2 - Drained peat soils are a significant source of greenhouse gas (GHG) emissions to the atmosphere. Rewetting these soils is considered an important climate change mitigation tool to reduce emissions and create suitable conditions for carbon sequestration. Long-term monitoring is essential to capture interannual variations in GHG emissions and associated environmental variables and to reduce the uncertainty linked with GHG emission factor calculations. In this study, we present GHG balances: carbon dioxide (CO2), methane (CH4) and nitrous oxide (N2 O) calculated for a 5-year period at a rewetted industrial cutaway peatland in Ireland (rewetted 7 years prior to the start of the study); and compare the results with an adjacent drained area (2-year data set), and with ten long-term data sets from intact (i.e. undrained) peatlands in temperate and boreal regions. In the rewetted site, CO2 exchange (or net ecosystem exchange (NEE)) was strongly influenced by ecosystem respiration (Reco) rather than gross primary production (GPP). CH4 emissions were related to soil temperature and either water table level or plant biomass. N2 O emissions were not detected in either drained or rewetted sites. Rewetting reduced CO2 emissions in unvegetated areas by approximately 50%. When upscaled to the ecosystem level, the emission factors (calculated as 5-year mean of annual balances) for the rewetted site were (±SD) -104 ± 80 g CO2 -C m-2 yr-1 (i.e. CO2 sink) and 9 ± 2 g CH4 -C m-2 yr-1 (i.e. CH4 source). Nearly a decade after rewetting, the GHG balance (100-year global warming potential) had reduced noticeably (i.e. less warming) in comparison with the drained site but was still higher than comparative intact sites. Our results indicate that rewetted sites may be more sensitive to interannual changes in weather conditions than their more resilient intact counterparts and may switch from an annual CO2 sink to a source if triggered by slightly drier conditions. SN - 1365-2486 UR - https://www.unboundmedicine.com/medline/citation/27099183/Multiyear_greenhouse_gas_balances_at_a_rewetted_temperate_peatland_ L2 - https://doi.org/10.1111/gcb.13325 DB - PRIME DP - Unbound Medicine ER -