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Biogeochemistry

, Volume 108, Issue 1–3, pp 77–90 | Cite as

Temperature sensitivity of greenhouse gas production in wetland soils of different vegetation

  • K. S. Inglett
  • P. W. Inglett
  • K. R. Reddy
  • T. Z. Osborne
Article

Abstract

Organic matter decomposition regulates rates of carbon loss (CO2 and CH4) in wetlands and has implications for carbon sequestration in the context of changing global temperature. Here we determined the influence of temperature and vegetation type on both aerobic and anaerobic decomposition of organic matter in subtropical wetland soils. As in many other studies, increased temperature resulted in higher rates of respiration and methanogenesis under both aerobic and anaerobic conditions, and the positive effect of temperature depended on vegetation (source of carbon substrate to soil). Under anaerobic incubations, the proportion of gaseous C (CO2 and CH4) lost as CH4 increased with temperature indicating a greater sensitivity of methanogenesis to temperature. This was further supported by a wider range of Q10 values (1.4–3.6) for methane production as compared with anaerobic CO2 (1.3–2.5) or aerobic CO2 (1.4–2.1) production. The increasing strength of positive linear correlation between CO2:CH4 ratio and the soil organic matter ligno-cellulose index at higher temperature indicated that the temperature sensitivity of methanogenesis was likely the result of increased C availability at higher temperature. This information adds to our basic understanding of decomposition in warmer subtropical and tropical wetland systems and has implications for C models in wetlands with different vegetation types.

Keywords

Decomposition Subtropical Q10 Methane CO2 

Notes

Acknowledgments

This work was supported by funding from the St Johns River water management district, Palatka, Florida. We sincerely appreciate the critical reviews provided by the anonymous reviewers, which greatly improved the overall quality of our paper.

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Copyright information

© Springer Science+Business Media B.V. 2011

Authors and Affiliations

  • K. S. Inglett
    • 1
  • P. W. Inglett
    • 1
  • K. R. Reddy
    • 1
  • T. Z. Osborne
    • 1
  1. 1.Soil and Water Science DepartmentUniversity of FloridaGainesvilleUSA

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