Methane emissions from five wetland plant communities with different hydroperiods in the Big Cypress Swamp region of Florida Everglades

  • Villa J
  • Mitsch W
  • 50

    Readers

    Mendeley users who have this article in their library.
  • 11

    Citations

    Citations of this article.

Abstract

The majority of the methane (CH4) emitted from wetlands comes from tropical and subtropical zones. On a global scale, the variability of these emissions had been attributed to water table variations; however, at landscape scales this variability is poorly understood. We measured CH4fluxes from five characteristic wetland plant communities of southwest Florida representing a gradient in inundation periods. From wettest to driest conditions, communities were designated as deep slough, bald cypress, wet prairie, pond cypress and hydric pine flatwood. Non-steady-state rigid chambers were deployed at each community sequentially at three different times of the day during a 24-month period. CH4fluxes did not show a discernible daily pattern, in contrast to a marked seasonal increase in emissions during inundation. All wetland communities acted as temporary sinks of CH4, but overall were net sources. Median and mean ± standard error fluxes in CH4-C m-2d-1were higher in deep slough (11 and 55.3 ± 21.5), followed by the wet prairie (9.01 and 53.3 ± 26.6), bald cypress (3.31 and 5.54 ± 2.51) and pond cypress (1.49, 4.55 ± 3.35). The pine flatwood community acted as a net sink during the study period (0.0 and-1.22 ± 0.81). Seasonality in CH4emissions was positively correlated with water levels, but not with soil temperature. However, longer inundation periods did not necessarily result in higher CH4emissions. These findings add to our current knowledge of CH4fluxes from subtropical wetland ecosystems and have implications for modeling at ecosystem scales in heterogeneous wetland landscapes.

Author-supplied keywords

  • Climate change
  • Cypress swamp
  • Florida
  • Hydroperiod
  • Methane emissions
  • Southwest
  • Subtropical wetlands

Get free article suggestions today

Mendeley saves you time finding and organizing research

Sign up here
Already have an account ?Sign in

Find this document

Cite this document

Choose a citation style from the tabs below

Save time finding and organizing research with Mendeley

Sign up for free