期刊
NATURE ECOLOGY & EVOLUTION
卷 5, 期 4, 页码 504-+出版社
NATURE PORTFOLIO
DOI: 10.1038/s41559-021-01401-7
关键词
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资金
- NOAA Climate and Global Change postdoctoral fellowship programme
- USDA National Institute of Food and Agriculture [2018-67012-28077]
- Gordon and Betty Moore Foundation
- Cedar Creek Long Term Ecological Research programme [DEB 1234162, 0620652, 1831944, DBI 2021898]
- National Park Service
- South African National Parks
- Lawrence Fellow award - LLNL-LDRD Program [20-ERD-055]
- Sequoia Parks Conservancy
This study examines the impacts of changes in fire frequency on tree communities in 29 different sites, revealing that repeated burning generally reduces stem density and basal area. The most pronounced effects are observed in savanna ecosystems and sites with strong wet or dry seasons.
Global change has resulted in chronic shifts in fire regimes. Variability in the sensitivity of tree communities to multi-decadal changes in fire regimes is critical to anticipating shifts in ecosystem structure and function, yet remains poorly understood. Here, we address the overall effects of fire on tree communities and the factors controlling their sensitivity in 29 sites that experienced multi-decadal alterations in fire frequencies in savanna and forest ecosystems across tropical and temperate regions. Fire had a strong overall effect on tree communities, with an average fire frequency (one fire every three years) reducing stem density by 48% and basal area by 53% after 50 years, relative to unburned plots. The largest changes occurred in savanna ecosystems and in sites with strong wet seasons or strong dry seasons, pointing to fire characteristics and species composition as important. Analyses of functional traits highlighted the impact of fire-driven changes in soil nutrients because frequent burning favoured trees with low biomass nitrogen and phosphorus content, and with more efficient nitrogen acquisition through ectomycorrhizal symbioses. Taken together, the response of trees to altered fire frequencies depends both on climatic and vegetation determinants of fire behaviour and tree growth, and the coupling between fire-driven nutrient losses and plant traits. Using tree community data from 29 tropical and temperate sites that have experienced multi-decadal alterations in fire frequency, the authors show repeated burning generally reduces stem density and basal area, with most pronounced effects in savanna ecosystems and in sites with strong wet seasons or strong dry seasons.
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