Dominant drivers of seedling establishment in a fire-dependent obligate seeder: climate or fire regimes?

Smith, Annabel L., Blair, David, McBurney, Lachlan, Banks, Sam C., Barton, Philip S., Blanchard, Wade, Driscoll, Don A., Gill, A. Malcolm and Lindenmayer, David B. 2014, Dominant drivers of seedling establishment in a fire-dependent obligate seeder: climate or fire regimes?, Ecosystems, vol. 17, no. 2, pp. 258-270, doi: 10.1007/s10021-013-9721-9.

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Title Dominant drivers of seedling establishment in a fire-dependent obligate seeder: climate or fire regimes?
Author(s) Smith, Annabel L.
Blair, David
McBurney, Lachlan
Banks, Sam C.
Barton, Philip S.
Blanchard, Wade
Driscoll, Don A.ORCID iD for Driscoll, Don A.
Gill, A. Malcolm
Lindenmayer, David B.
Journal name Ecosystems
Volume number 17
Issue number 2
Start page 258
End page 270
Total pages 13
Publisher Springer
Place of publication Berlin, Germany
Publication date 2014-03
ISSN 1432-9840
Keyword(s) climate change
fire return interval
fire severity
forest management
plant functional type
range shift
regeneration niche
Summary Climate change is causing fire regime shifts in ecosystems worldwide. Plant species with regeneration strategies strongly linked to a fire regime, such as obligate seeders, may be particularly threatened by these changes. It is unclear whether changes in fire regimes or the direct effects of climate change will be the dominant threats to obligate seeders in future. We investigated the relative importance of fire-related variables (fire return interval andfire severity) and environmental factors (climate and topography) on seedling establishment in the world's tallest angiosperm, an obligate seeder, Eucalyptus regnans. Throughout its range, this species dominates the wet montane forests of south-eastern Australia and plays a keystone role in forest structure. Following major wildfires, we investigated seedling establishment in E. regnanswithin 1 year of fire as this is a critical stage in the regeneration niche of obligate seeders. Seedling presence and abundance were strongly related to the occurrence of fire but not to variation in fire severity (moderate vs. high severity). Seedling abundance increased with increasing fire return interval (range 26-300 years). First-year seedling establishment was also strongly associated with low temperatures and with high elevations, high precipitation and persistent soil water availability. Our results show that both climate and fire regimes are strong drivers of E. regnans seedling establishment. The predicted warming and drying of the climate might reduce the regeneration potential for some obligate seeders in future and these threats are likely to be compounded by changes in fire regimes, particularly increases in fire frequency.
Language eng
DOI 10.1007/s10021-013-9721-9
Field of Research 070503 Forestry Fire Management
Socio Economic Objective 970105 Expanding Knowledge in the Environmental Sciences
HERDC Research category C1.1 Refereed article in a scholarly journal
ERA Research output type C Journal article
Copyright notice ©2013, Springer Science+Business Media New York
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