Impacts of fire on sources of soil CO2 efflux in a dry Amazon rain forest

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Impacts of fire on sources of soil CO2 efflux in a dry Amazon rain forest. / Metcalfe, Daniel B.; Rocha, Wanderley; Balch, Jennifer K.; Brando, Paulo M.; Doughty, Christopher E.; Malhi, Yadvinder.

I: Global Change Biology, Vol. 24, Nr. 8, 08.2018, s. 3629-3641.

Forskningsoutput: TidskriftsbidragArtikel i vetenskaplig tidskrift

Harvard

Metcalfe, DB, Rocha, W, Balch, JK, Brando, PM, Doughty, CE & Malhi, Y 2018, 'Impacts of fire on sources of soil CO2 efflux in a dry Amazon rain forest', Global Change Biology, vol. 24, nr. 8, s. 3629-3641. https://doi.org/10.1111/gcb.14305

APA

Metcalfe, D. B., Rocha, W., Balch, J. K., Brando, P. M., Doughty, C. E., & Malhi, Y. (2018). Impacts of fire on sources of soil CO2 efflux in a dry Amazon rain forest. Global Change Biology, 24(8), 3629-3641. https://doi.org/10.1111/gcb.14305

CBE

MLA

Vancouver

Author

Metcalfe, Daniel B. ; Rocha, Wanderley ; Balch, Jennifer K. ; Brando, Paulo M. ; Doughty, Christopher E. ; Malhi, Yadvinder. / Impacts of fire on sources of soil CO2 efflux in a dry Amazon rain forest. I: Global Change Biology. 2018 ; Vol. 24, Nr. 8. s. 3629-3641.

RIS

TY - JOUR

T1 - Impacts of fire on sources of soil CO2 efflux in a dry Amazon rain forest

AU - Metcalfe, Daniel B.

AU - Rocha, Wanderley

AU - Balch, Jennifer K.

AU - Brando, Paulo M.

AU - Doughty, Christopher E.

AU - Malhi, Yadvinder

PY - 2018/8

Y1 - 2018/8

N2 - 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 1 year, and compared these measurements to replicated data from a nearby, unmodified Control plot. After four burns over 5 years, soil CO2 efflux (Rs) was ~5.5 t C ha-1 year-1 lower on the Fire plot compared to the Control. Most of the Fire plot Rs reduction was specifically due to lower ground surface litter and root respiration. Mycorrhizal respiration on both plots was around ~20% of Rs. Soil surface temperature appeared to be more important than moisture as a driver of seasonal patterns in Rs at the site. Regular fire events decreased the seasonality of Rs 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.

AB - 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 1 year, and compared these measurements to replicated data from a nearby, unmodified Control plot. After four burns over 5 years, soil CO2 efflux (Rs) was ~5.5 t C ha-1 year-1 lower on the Fire plot compared to the Control. Most of the Fire plot Rs reduction was specifically due to lower ground surface litter and root respiration. Mycorrhizal respiration on both plots was around ~20% of Rs. Soil surface temperature appeared to be more important than moisture as a driver of seasonal patterns in Rs at the site. Regular fire events decreased the seasonality of Rs 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.

KW - Amazon tropical rain forest

KW - Burn experiment

KW - Carbon dioxide

KW - Climate change

KW - Fire

KW - Mycorrhizae

KW - Soil respiration partitioning

UR - http://www.scopus.com/inward/record.url?scp=85047797011&partnerID=8YFLogxK

U2 - 10.1111/gcb.14305

DO - 10.1111/gcb.14305

M3 - Article

VL - 24

SP - 3629

EP - 3641

JO - Global Change Biology

JF - Global Change Biology

SN - 1354-1013

IS - 8

ER -