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The Effects of Hydrological Management on Methane Emissions from Southeastern Shrub Bogs of the USA

Publication ,  Journal Article
Wang, H; Ho, M; Flanagan, N; Richardson, CJ
Published in: Wetlands
October 2021

Peatlands are responsible for the majority of methane (CH₄) emission from wetlands globally. Hydrological changes induced by climatic and anthropogenic disturbance may substantially alter CH₄ emission in peatlands. Here we measured CH₄ emission monthly for 1.5 years in natural, drained and restored shrub bogs in North Carolina, USA. Methane emissions from all sites were consistently low (< 0.05 mg CH₄ m⁻ ² h⁻ ¹). We occasionally detected markedly higher CH₄ emissions (> 1 mg CH₄ m⁻ ² h⁻ ¹) at sites where the water level remained close to the ground surface for 2–3 months, suggesting that surface litter mostly, not deep peat, contributes to CH₄ emission. We verified this inference by incubating 2-cm sections of peat sliced from intact soil cores for 6 months. Only the saturated surface litter emitted CH₄, which indicated a 5-cm threshold of ground water level for CH₄ emission in our shrub bogs. During a wet year, water levels in the wet sites (natural and restored) remained at least 5 cm below soil surface for about 90 % of the days. We thus demonstrate the CH₄ emission is negligible from these shrub bogs. This study also indicates that restoration through a non-inundated rewetting would not stimulate CH₄ emission in drained/degraded low-latitude shrub bogs, such as pocosins.

Duke Scholars

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Published In

Wetlands

DOI

ISSN

0277-5212

Publication Date

October 2021

Volume

41

Issue

7

Start / End Page

87

Related Subject Headings

  • Ecology
  • 41 Environmental sciences
  • 37 Earth sciences
  • 31 Biological sciences
  • 06 Biological Sciences
  • 05 Environmental Sciences
  • 04 Earth Sciences
 

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Wang, H., Ho, M., Flanagan, N., & Richardson, C. J. (2021). The Effects of Hydrological Management on Methane Emissions from Southeastern Shrub Bogs of the USA. Wetlands, 41(7), 87. https://doi.org/10.1007/s13157-021-01486-7
Wang, Hongjun, Mengchi Ho, Neal Flanagan, and Curtis J. Richardson. “The Effects of Hydrological Management on Methane Emissions from Southeastern Shrub Bogs of the USA.” Wetlands 41, no. 7 (October 2021): 87. https://doi.org/10.1007/s13157-021-01486-7.
Wang H, Ho M, Flanagan N, Richardson CJ. The Effects of Hydrological Management on Methane Emissions from Southeastern Shrub Bogs of the USA. Wetlands. 2021 Oct;41(7):87.
Wang, Hongjun, et al. “The Effects of Hydrological Management on Methane Emissions from Southeastern Shrub Bogs of the USA.” Wetlands, vol. 41, no. 7, Oct. 2021, p. 87. Epmc, doi:10.1007/s13157-021-01486-7.
Wang H, Ho M, Flanagan N, Richardson CJ. The Effects of Hydrological Management on Methane Emissions from Southeastern Shrub Bogs of the USA. Wetlands. 2021 Oct;41(7):87.
Journal cover image

Published In

Wetlands

DOI

ISSN

0277-5212

Publication Date

October 2021

Volume

41

Issue

7

Start / End Page

87

Related Subject Headings

  • Ecology
  • 41 Environmental sciences
  • 37 Earth sciences
  • 31 Biological sciences
  • 06 Biological Sciences
  • 05 Environmental Sciences
  • 04 Earth Sciences