期刊
JOURNAL OF ENVIRONMENTAL MANAGEMENT
卷 231, 期 -, 页码 59-65出版社
ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD
DOI: 10.1016/j.jenvman.2018.10.021
关键词
Fire; Eucalypt; Escape size; Interval squeeze; Fire regime; Fire frequency; Resistance; Resilience
资金
- Australian Postgraduate Award
- Australian Research Council [LP120200795]
- Holsworth Wildlife Research Endowment
- VEAC Bill Borthwick Student Scholarship
- Integrated Forest Ecosystem Research program
- Victoria's Department of Environment, Land, Water, and Planning
- Australian Research Council [LP120200795] Funding Source: Australian Research Council
Epicormic and basal resprouting promote tree survival and persistence in fire-prone regions worldwide. However, little is known about limits to resprouting effectiveness when severe wildfires increase in frequency. In the extensive fire-tolerant mixed-eucalypt forests of temperate Australia, we examined the effects of one and two high-severity wildfires within six years on relationships between tree size (stem diameter) and resprouting (epicormic and/or basal), and on seedling regeneration. The diameter of eucalypts likely to be topkilled (no epicormic recovery) by high-severity fire increased from similar to 15 cm after the first wildfire to similar to 22 cm after the second. Middle-sized stems (22-36 cm diameter) were likely to resprout both epicormically and basally after one wildfire, but short-interval wildfires eroded this dual capacity, thereby reducing the probability of survival. Seedling abundance also decreased after two successive fires. Our study indicates that short-interval wildfires increased tree 'escape size', and eroded resprouting success particularly of middle-sized trees, which were too large for basal resprouting but too small for epicormic recovery. This, in combination with reduced seedling recruitment, portends structural and demographic challenges for even the most fire-tolerant forests under emerging fire regimes.
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