globalchange  > 影响、适应和脆弱性
DOI: 10.1111/gcb.14305
Scopus记录号: 2-s2.0-85047797011
论文题名:
Impacts of fire on sources of soil CO2 efflux in a dry Amazon rain forest
作者: Metcalfe D.B.; Rocha W.; Balch J.K.; Brando P.M.; Doughty C.E.; Malhi Y.
刊名: Global Change Biology
ISSN: 13541013
出版年: 2018
卷: 24, 期:8
起始页码: 3629
结束页码: 3641
语种: 英语
英文关键词: Amazon tropical rain forest ; burn experiment ; carbon dioxide ; climate change ; fire ; mycorrhizae ; soil respiration partitioning
Scopus关键词: carbon cycle ; carbon dioxide ; carbon flux ; climate change ; forest fire ; rainforest ; soil carbon ; soil respiration ; soil temperature ; tropical forest ; Amazonia ; Brazil ; Mato Grosso
英文摘要: 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. © 2018 John Wiley & Sons Ltd
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/110315
Appears in Collections:影响、适应和脆弱性
气候变化事实与影响

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作者单位: Department of Physical Geography and Ecosystem Science, Lund University, Lund, Sweden; Department of Ecology and Environmental Science, Umeå University, Umeå, Sweden; Instituto de Pesquisa Ambiental da Amazônia, Canarana, Brazil; Department of Geography, University of Colorado-Boulder, Boulder, CO, United States; Woods Hole Research Center, Falmouth, MA, United States; School of Informatics, Computing, and Cyber Systems, Northern Arizona University, Flagstaff, AZ, United States; Environmental Change Institute, School of Geography and the Environment, University of Oxford, Oxford, United Kingdom

Recommended Citation:
Metcalfe D.B.,Rocha W.,Balch J.K.,et al. Impacts of fire on sources of soil CO2 efflux in a dry Amazon rain forest[J]. Global Change Biology,2018-01-01,24(8)
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