DOI: 10.1111/gcb.13172
论文题名: Effects of experimental fuel additions on fire intensity and severity: unexpected carbon resilience of a neotropical forest
作者: Brando P.M. ; Oliveria-Santos C. ; Rocha W. ; Cury R. ; Coe M.T.
刊名: Global Change Biology
出版年: 2016
卷: 22, 期: 7 起始页码: 2516
结束页码: 2525
语种: 英语
英文关键词: Amazon
; Brazil
; carbon emissions
; forest degradation
; tree mortality
Scopus关键词: canopy
; carbon cycle
; carbon emission
; experimental study
; forest fire
; forest management
; mortality
; tree
; Amazonia
; Brazil
英文摘要: Global changes and associated droughts, heat waves, logging activities, and forest fragmentation may intensify fires in Amazonia by altering forest microclimate and fuel dynamics. To isolate the effects of fuel loads on fire behavior and fire-induced changes in forest carbon cycling, we manipulated fine fuel loads in a fire experiment located in southeast Amazonia. We predicted that a 50% increase in fine fuel loads would disproportionally increase fire intensity and severity (i.e., tree mortality and losses in carbon stocks) due to multiplicative effects of fine fuel loads on the rate of fire spread, fuel consumption, and burned area. The experiment followed a fully replicated randomized block design (N = 6) comprised of unburned control plots and burned plots that were treated with and without fine fuel additions. The fuel addition treatment significantly increased burned area (+22%) and consequently canopy openness (+10%), fine fuel combustion (+5%), and mortality of individuals ≥5 cm in diameter at breast height (dbh; +37%). Surprisingly, we observed nonsignificant effects of the fuel addition treatment on fireline intensity, and no significant differences among the three treatments for (i) mortality of large trees (≥30 cm dbh), (ii) aboveground forest carbon stocks, and (iii) soil respiration. It was also surprising that postfire tree growth and wood increment were higher in the burned plots treated with fuels than in the unburned control. These results suggest that (i) fine fuel load accumulation increases the likelihood of larger understory fires and (ii) single, low-intensity fires weakly influence carbon cycling of this primary neotropical forest, although delayed postfire mortality of large trees may lower carbon stocks over the long term. Overall, our findings indicate that increased fine fuel loads alone are unlikely to create threshold conditions for high-intensity, catastrophic fires during nondrought years. © 2016 John Wiley & Sons Ltd 资助项目: Brando, P.M.
; Instituto de Pesquisa Ambiental da Amazônia, SHIN CA 5, Bloco J2, Sala 309, Bairro, Brazil
; 电子邮件: pmbrando@ipam.org.br
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/61372
Appears in Collections: 影响、适应和脆弱性
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作者单位: Instituto de Pesquisa Ambiental da Amazônia, SHIN CA 5, Bloco J2, Sala 309, Bairro, Lago Norte, Brasília-DF, Brazil; Woods Hole Research Center, 149 Woods Hole Road, Falmouth, MA, United States; Carnegie Institution for Science, 260 Panama Street, Stanford, CA, United States; Programa de Pós-Graduação em Ciências Biológicas, Universidade Estadual de Londrina, Londrina-PR, Brazil
Recommended Citation:
Brando P.M.,Oliveria-Santos C.,Rocha W.,et al. Effects of experimental fuel additions on fire intensity and severity: unexpected carbon resilience of a neotropical forest[J]. Global Change Biology,2016-01-01,22(7)