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Impacts of fire on sources of soil CO2 efflux in a dry Amazon rain forest
Umeå University, Faculty of Science and Technology, Department of Ecology and Environmental Sciences. Department of Physical Geography and Ecosystem Science, Lund University, Lund, Sweden.ORCID iD: 0000-0001-8325-9269
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2018 (English)In: Global Change Biology, ISSN 1354-1013, E-ISSN 1365-2486, Vol. 24, no 8, p. 3629-3641Article in journal (Refereed) Published
Abstract [en]

Fire at the dry southern margin of the Amazon rainforest could have major consequences for regional soil carbon (C) storage and ecosystem carbon dioxide (CO2) emissions, but relatively little information exists about impacts of fire on soil C cycling within this sensitive ecotone. We measured CO2 effluxes from different soil components (ground surface litter, roots, mycorrhizae, soil organic matter) at a large-scale burn experiment designed to simulate a severe but realistic potential future scenario for the region (Fire plot) in Mato Grosso, Brazil, over 1year, and compared these measurements to replicated data from a nearby, unmodified Control plot. After four burns over 5 years, soil CO2 efflux (R-s) was similar to 5.5 t C ha(-1) year(-1) lower on the Fire plot compared to the Control. Most of the Fire plot R-s reduction was specifically due to lower ground surface litter and root respiration. Mycorrhizal respiration on both plots was around similar to 20% of R-s. Soil surface temperature appeared to be more important than moisture as a driver of seasonal patterns in R-s at the site. Regular fire events decreased the seasonality of R-s at the study site, due to apparent differences in environmental sensitivities among biotic and abiotic soil components. These findings may contribute toward improved predictions of the amount and temporal pattern of C emissions across the large areas of tropical forest facing increasing fire disturbances associated with climate change and human activities.

Place, publisher, year, edition, pages
John Wiley & Sons, 2018. Vol. 24, no 8, p. 3629-3641
Keywords [en]
Amazon tropical rain forest, burn experiment, carbon dioxide, climate change, fire, mycorrhizae, soil respiration partitioning
National Category
Climate Research
Identifiers
URN: urn:nbn:se:umu:diva-150650DOI: 10.1111/gcb.14305ISI: 000437284700030PubMedID: 29748988Scopus ID: 2-s2.0-85047797011OAI: oai:DiVA.org:umu-150650DiVA, id: diva2:1242776
Available from: 2018-08-29 Created: 2018-08-29 Last updated: 2018-08-29Bibliographically approved

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CiteExportLink to record
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