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Multi-year net ecosystem carbon balance of a restored peatland reveals a return to carbon sink.
Glob Chang Biol 2018; 24(12):5751-5768GC

Abstract

Peatlands after drainage and extraction are large sources of carbon (C) to the atmosphere. Restoration, through re-wetting and revegetation, aims to return the C sink function by re-establishing conditions similar to that of an undrained peatland. However, the time needed to re-establish C sequestration is not well constrained due to the lack of multi-year measurements. We measured over 3 years the net ecosystem exchange of CO2 (NEE), methane (<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msub><mml:mi>F</mml:mi> <mml:msub><mml:mi>CH</mml:mi> <mml:mn>4</mml:mn></mml:msub> </mml:msub> </mml:math>), and dissolved organic carbon (DOC) at a restored post-extraction peatland (RES) in southeast Canada (restored 14 years prior to the start of the study) and compared our observations to the C balance of an intact reference peatland (REF) that has a long-term continuous flux record and is in the same climate zone. Small but significant differences in winter respiration driven by temperature were mainly responsible for differences in cumulative NEE between years. Low growing season inter-annual variability was linked to constancy of the initial spring water table position, controlled by the blocked drainage ditches and the presence of water storage structures (bunds and pools). Half-hour <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msub><mml:mi>F</mml:mi> <mml:msub><mml:mi>CH</mml:mi> <mml:mn>4</mml:mn></mml:msub> </mml:msub> </mml:math> at RES was small except when Typha latifolia-invaded drainage ditches were in the tower footprint; this effect at the ecosystem level was small as ditches represent a minor fraction of RES. The restored peatland was an annual sink for CO2 (-90 ± 18 g C m-2 year-1), a source of CH4 (4.4 ± 0.2 g C m-2 year-1), and a source of DOC (6.9 ± 2.2 g C m-2 year-1), resulting in mean net ecosystem uptake of 78 ± 17 g C m-2 year-1 . Annual NEE at RES was most similar to wetter, more productive years at REF. Integrating structures to increase water retention, alongside re-establishing key species, have been effective at re-establishing the net C sink rate to that of an intact peatland.

Authors+Show Affiliations

Department of Natural Resource Sciences, McGill University, Ste-Anne-de-Bellevue, Québec, Canada.Department of Natural Resource Sciences, McGill University, Ste-Anne-de-Bellevue, Québec, Canada.Department of Geography and Environmental Management, University of Waterloo, Waterloo, Ontario, Canada.Department of Geography, McGill University, Montréal, Québec, Canada.Department of Plant Sciences, Université Laval, Québec City, Québec, Canada.

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

30225998

Citation

Nugent, Kelly A., et al. "Multi-year Net Ecosystem Carbon Balance of a Restored Peatland Reveals a Return to Carbon Sink." Global Change Biology, vol. 24, no. 12, 2018, pp. 5751-5768.
Nugent KA, Strachan IB, Strack M, et al. Multi-year net ecosystem carbon balance of a restored peatland reveals a return to carbon sink. Glob Chang Biol. 2018;24(12):5751-5768.
Nugent, K. A., Strachan, I. B., Strack, M., Roulet, N. T., & Rochefort, L. (2018). Multi-year net ecosystem carbon balance of a restored peatland reveals a return to carbon sink. Global Change Biology, 24(12), pp. 5751-5768. doi:10.1111/gcb.14449.
Nugent KA, et al. Multi-year Net Ecosystem Carbon Balance of a Restored Peatland Reveals a Return to Carbon Sink. Glob Chang Biol. 2018;24(12):5751-5768. PubMed PMID: 30225998.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Multi-year net ecosystem carbon balance of a restored peatland reveals a return to carbon sink. AU - Nugent,Kelly A, AU - Strachan,Ian B, AU - Strack,Maria, AU - Roulet,Nigel T, AU - Rochefort,Line, Y1 - 2018/10/09/ PY - 2018/06/28/received PY - 2018/07/31/accepted PY - 2018/9/19/pubmed PY - 2019/3/5/medline PY - 2018/9/19/entrez KW - carbon dioxide KW - eddy covariance KW - methane KW - net ecosystem carbon balance KW - peatland restoration SP - 5751 EP - 5768 JF - Global change biology JO - Glob Chang Biol VL - 24 IS - 12 N2 - Peatlands after drainage and extraction are large sources of carbon (C) to the atmosphere. Restoration, through re-wetting and revegetation, aims to return the C sink function by re-establishing conditions similar to that of an undrained peatland. However, the time needed to re-establish C sequestration is not well constrained due to the lack of multi-year measurements. We measured over 3 years the net ecosystem exchange of CO2 (NEE), methane (<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msub><mml:mi>F</mml:mi> <mml:msub><mml:mi>CH</mml:mi> <mml:mn>4</mml:mn></mml:msub> </mml:msub> </mml:math>), and dissolved organic carbon (DOC) at a restored post-extraction peatland (RES) in southeast Canada (restored 14 years prior to the start of the study) and compared our observations to the C balance of an intact reference peatland (REF) that has a long-term continuous flux record and is in the same climate zone. Small but significant differences in winter respiration driven by temperature were mainly responsible for differences in cumulative NEE between years. Low growing season inter-annual variability was linked to constancy of the initial spring water table position, controlled by the blocked drainage ditches and the presence of water storage structures (bunds and pools). Half-hour <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msub><mml:mi>F</mml:mi> <mml:msub><mml:mi>CH</mml:mi> <mml:mn>4</mml:mn></mml:msub> </mml:msub> </mml:math> at RES was small except when Typha latifolia-invaded drainage ditches were in the tower footprint; this effect at the ecosystem level was small as ditches represent a minor fraction of RES. The restored peatland was an annual sink for CO2 (-90 ± 18 g C m-2 year-1), a source of CH4 (4.4 ± 0.2 g C m-2 year-1), and a source of DOC (6.9 ± 2.2 g C m-2 year-1), resulting in mean net ecosystem uptake of 78 ± 17 g C m-2 year-1 . Annual NEE at RES was most similar to wetter, more productive years at REF. Integrating structures to increase water retention, alongside re-establishing key species, have been effective at re-establishing the net C sink rate to that of an intact peatland. SN - 1365-2486 UR - https://www.unboundmedicine.com/medline/citation/30225998/Multi_year_net_ecosystem_carbon_balance_of_a_restored_peatland_reveals_a_return_to_carbon_sink_ L2 - https://doi.org/10.1111/gcb.14449 DB - PRIME DP - Unbound Medicine ER -