globalchange  > 气候变化与战略
DOI: 10.1111/geb.13034
论文题名:
Thresholds of fire response to moisture and fuel load differ between tropical savannas and grasslands across continents
作者: Alvarado S.T.; Andela N.; Silva T.S.F.; Archibald S.
刊名: Global Ecology and Biogeography
ISSN: 1466822X
出版年: 2020
卷: 29, 期:2
语种: 英语
英文关键词: ecosystem models ; fire regimes ; fuel build-up ; fuel moisture ; future scenarios ; tropical savannas
Scopus关键词: annual variation ; ecosystem modeling ; fire behavior ; fuel ; future prospect ; grassland ; moisture ; rainfall ; remote sensing ; savanna ; threshold ; tropical environment
英文摘要: Aim: An emerging framework for tropical ecosystems states that fire activity is either “fuel build-up limited” or “fuel moisture limited”, that is, as you move up along rainfall gradients, the major control on fire occurrence switches from being the amount of fuel, to the moisture content of the fuel. Here we used remotely sensed datasets to assess whether interannual variability of burned area is better explained by annual rainfall totals driving fuel build-up, or by dry season rainfall driving fuel moisture. Location: Pantropical savannas and grasslands. Time period: 2002–2016. Methods: We explored the response of annual burned area to interannual variability in rainfall. We compared several linear models to understand how fuel moisture and fuel build-up effect (accumulated rainfall during 6 and 24 months prior to the end of the burning season, respectively) determine the interannual variability of burned area and explore if tree cover, dry season duration and human activity modified these relationships. Results: Fuel and moisture controls on fire occurrence in tropical savannas varied across continents. Only 24% of South American savannas were fuel build-up limited against 61% of Australian savannas and 47% of African savannas. On average, South America switched from fuel limited to moisture limited at 500 mm/year, Africa at 800 mm/year and Australia at 1,000 mm/year of mean annual rainfall. Main conclusions: In 42% of tropical savannas (accounting for 41% of current area burned) increased drought and higher temperatures will not increase fire, but there are savannas, particularly in South America, that are likely to become more flammable with increasing temperatures. These findings highlight that we cannot transfer knowledge of fire responses to global change across ecosystems/regions—local solutions to local fire management issues are required, and different tropical savanna regions may show contrasting responses to the same drivers of global change. © 2019 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/159716
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作者单位: Instituto de Geociências e Ciências Exatas, Ecosystem Dynamics Observatory, Universidade Estadual Paulista (UNESP), Rio Claro, São Paulo, Brazil; Programa de Pós-graduação em Agricultura e Ambiente, Universidade Estadual do Maranhão (UEMA), Balsas, Maranhão, Brazil; Programa de Pós-graduação em Geografia,Natureza e Dinâmica do Espaço, Universidade Estadual do Maranhão (UEMA), Sao Luis, Maranhão, Brazil; Biospheric Sciences Laboratory, NASA Goddard Space Flight Center, Greenbelt, MD, United States; Faculty of Natural Sciences, Stirling University, Stirling, United Kingdom; Centre for African Ecology, School of Animal, Plant and Environmental Sciences, University of the Witwatersrand, Johannesburg, South Africa

Recommended Citation:
Alvarado S.T.,Andela N.,Silva T.S.F.,et al. Thresholds of fire response to moisture and fuel load differ between tropical savannas and grasslands across continents[J]. Global Ecology and Biogeography,2020-01-01,29(2)
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