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Tropical wetlands: A missing link in the global carbon cycle?

Sjögersten, S and Black, CR and Evers, SL and Hoyos-Santillan, J and Wright, EL and Turner, BL (2014) Tropical wetlands: A missing link in the global carbon cycle? GLOBAL BIOGEOCHEMICAL CYCLES, 28 (12). pp. 1371-1386. ISSN 0886-6236

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Abstract

Tropical wetlands are not included in Earth system models, despite being an important source of methane (CH4) and contributing a large fraction of carbon dioxide (CO2) emissions from land use, land use change, and forestry in the tropics. This review identifies a remarkable lack of data on the carbon balance and gas fluxes from undisturbed tropical wetlands, which limits the ability of global change models to make accurate predictions about future climate. We show that the available data on in situ carbon gas fluxes in undisturbed forested tropical wetlands indicate marked spatial and temporal variability in CO2 and CH4 emissions, with exceptionally large fluxes in Southeast Asia and the Neotropics. By upscaling short-term measurements, we calculate that approximately 90 ± 77 Tg CH4 year−1 and 4540 ± 1480 Tg CO2 year−1 are released from tropical wetlands globally. CH4 fluxes are greater from mineral than organic soils, whereas CO2 fluxes do not differ between soil types. The high CO2 and CH4 emissions are mirrored by high rates of net primary productivity and litter decay. Net ecosystem productivity was estimated to be greater in peat-forming wetlands than on mineral soils, but the available data are insufficient to construct reliable carbon balances or estimate gas fluxes at regional scales. We conclude that there is an urgent need for systematic data on carbon dynamics in tropical wetlands to provide a robust understanding of how they differ from well-studied northern wetlands and allow incorporation of tropical wetlands into global climate change models.

Item Type: Article
Additional Information: Sjögersten, S., C. R. Black, S. Evers, J. Hoyos-Santillan, E. L. Wright, and B. L. Turner (2014), Tropical wetlands: A missing link in the global carbon cycle?, Global Biogeochem. Cycles, 28, 1371–1386, doi:10.1002/ 2014GB004844.
Uncontrolled Keywords: 0401 Atmospheric Sciences, 0402 Geochemistry
Subjects: G Geography. Anthropology. Recreation > GE Environmental Sciences
Divisions: Natural Sciences and Psychology
Publisher: American Geophysical Union (AGU)
Date Deposited: 30 Sep 2016 10:47
Last Modified: 07 Sep 2017 08:26
DOI or Identification number: 10.1002/2014GB004844
URI: http://researchonline.ljmu.ac.uk/id/eprint/4224

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