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Respiration in Aquatic Ecosystems$
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Paul del Giorgio and Peter Williams

Print publication date: 2005

Print ISBN-13: 9780198527084

Published to Oxford Scholarship Online: September 2007

DOI: 10.1093/acprof:oso/9780198527084.001.0001

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Respiration in wetland ecosystems

Respiration in wetland ecosystems

(p.83) CHAPTER 6 Respiration in wetland ecosystems
Respiration in Aquatic Ecosystems

Charlotte L. Roehm

Oxford University Press

This chapter reviews the current state of knowledge of respiration and emissions of carbon from freshwater wetlands to the atmosphere. Data are drawn from an array of studies addressing carbon dioxide and methane production and fluxes in wetland soils both in situ and in laboratory experiments. Regional estimates of wetland coverage are used to estimate the annual contribution of carbon dioxide-C and methane-C from each latitudinal zone and wetland type. The estimated mean rates of carbon dioxide and methane respiration from freshwater wetlands range between 0.1 and 0.6 mol C/m2-d and between 0.6 and 12 mmol C/m2-d, respectively. The mean rate for methane from rice paddies is 28 mmol C/m2-d. The global estimates for total carbon respired from freshwater wetlands are 966 Tmol/a from carbon dioxide and 23 Tmol/a from methane. The data suggest that wetland ecosystems are very sensitive to change, implying that these ecosystems may easily shift to becoming significant sources of carbon in the atmosphere.

Keywords:   freshwater wetlands, carbon dioxide, methane production, wetland respiration, global respiration

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