Wetlands

, Volume 35, Issue 4, pp 633–640

Patterns of Potential Methanogenesis Along Soil Moisture Gradients Following Drying and Rewetting in Midwestern Prairie Pothole Wetlands

  • Steven A. Kannenberg
  • Samuel T. Dunn
  • Sarah M. Ludwig
  • Seth A. Spawn
  • John D. Schade
Original Research

DOI: 10.1007/s13157-015-0653-3

Cite this article as:
Kannenberg, S.A., Dunn, S.T., Ludwig, S.M. et al. Wetlands (2015) 35: 633. doi:10.1007/s13157-015-0653-3

Abstract

Current models predict more intense rainstorms and extreme drought events in response to global climate change. In wetlands, greater variation in precipitation may increase fluctuation in wetland size, expanding the area of soil exposed to drying/rewetting cycles and periodic inundation. We investigated the potential impact of these changes on rates of methane (CH4) production from wetland soils along a moisture gradient encompassing open water through a zone of seasonal saturation to dry prairie. We used short (2 day) and long term (7 week) anoxic incubations of soils collected along our gradients to assess how soils exposed to varying levels of saturation would respond to drying/rewetting cycles and inundation. In both incubations, permanently-saturated soils showed the highest initial CH4 production potential. Seasonally-saturated (ephemeral) soils, however, generally produced more CH4 after short term drying and rewetting and after several weeks of anoxic incubation. Observed temporal delays in the onset of rapid CH4 production ranged from 5 to 30 days and were longer in ephemeral than in permanently wet soils. In addition, ephemeral soils showed larger increases in rates of CH4 production following temporal delays, suggesting increased CH4 production as wetlands become more hydrologically dynamic.

Keywords

Methanogenesis Temporal lag Ephemeral wetland Anoxic incubation Climate feedback 

Supplementary material

13157_2015_653_MOESM1_ESM.docx (71 kb)
Supplementary Fig. S1Examples of CH4 concentration time series data for COE and Bakko wetlands. Error bars indicate±1 standard error. (DOCX 70 kb)

Copyright information

© Society of Wetland Scientists 2015

Authors and Affiliations

  • Steven A. Kannenberg
    • 1
  • Samuel T. Dunn
    • 2
  • Sarah M. Ludwig
    • 3
  • Seth A. Spawn
    • 4
  • John D. Schade
    • 4
  1. 1.Department of BiologyIndiana UniversityBloomingtonUSA
  2. 2.Graduate Degree Program in EcologyColorado State UniversityFort CollinsUSA
  3. 3.Biology and Wildlife Department, Institute for Arctic ResearchUniversity of Alaska-FairbanksFairbanksUSA
  4. 4.Environmental Studies DepartmentSt. Olaf CollegeNorthfieldUSA

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