Hydrologic restoration decreases greenhouse gas emissions from shrub bog peatlands in southeastern US

Wetlands
By: , and 

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Abstract

Peatlands play a disproportionate role in the global carbon cycle. However, many peatlands have been ditched to lower the water table and converted into agriculture, which contributes to anthropogenic greenhouse gas emissions. Hydrologic restoration of drained peatlands could offset greenhouse gas emissions from these actions, but field examples that consider various greenhouse gases are still rare. Here, we examined emissions of carbon dioxide (CO2), methane (CH4), and nitrous oxide (N2O) from soils in drained shrub bogs in North Carolina, USA, before and after hydrologic restoration. We used static chamber methods and a before-and-after, control-impact (BACI) experimental design. We found that hydrologic manipulation (akin to restoration) increased water table levels by 65%, even with the impact of two hurricanes before and one after hydrologic manipulation. Increased water table levels led to a 58% decrease in CO2 fluxes, and an increase in CH4 (251%) and N2O fluxes (85%). Water table depth and soil temperature explained 43% of variation in CO2, while water table depth explained 25% and 18% of variation in CH4 and N2O fluxes, respectively. Despite the increases in CH4 and N2O, the higher magnitude of fluxes and large decline in CO2 lead to an overall lowering of greenhouse gas emissions after hydrologic restoration. Our results suggest that raising the water table in this shrub bog peatland decreased overall greenhouse gas emissions, illustrating that hydrologic restoration of peatlands can be a valuable climate mitigation practice.

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Publication type Article
Publication Subtype Journal Article
Title Hydrologic restoration decreases greenhouse gas emissions from shrub bog peatlands in southeastern US
Series title Wetlands
DOI 10.1007/s13157-022-01605-y
Volume 42
Year Published 2022
Language English
Publisher Springer
Contributing office(s) Wetland and Aquatic Research Center
Description 81, 10 p.
Country United States
State North Carolina
Other Geospatial Pocosin Lakes National Wildlife Refuge
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