globalchange  > 全球变化的国际研究计划
DOI: 10.1111/1365-2745.13227
WOS记录号: WOS:000474131500001
论文题名:
Eucalypt forests dominated by epicormic resprouters are resilient to repeated canopy fires
作者: Collins, Luke1,2,3
通讯作者: Collins, Luke
刊名: JOURNAL OF ECOLOGY
ISSN: 0022-0477
EISSN: 1365-2745
出版年: 2019
语种: 英语
英文关键词: fire regime ; fire resistance ; fire severity ; global change ; seedling recruitment ; temperate forest ; tree mortality ; tree topkill
WOS关键词: WILDFIRE SEVERITY ; BARK THICKNESS ; CLIMATE-CHANGE ; LOGGED SITES ; MORTALITY ; SAVANNA ; BIOMASS ; REGIME ; GROWTH ; TREES
WOS学科分类: Plant Sciences ; Ecology
WOS研究方向: Plant Sciences ; Environmental Sciences & Ecology
英文摘要:

Wildfire occurrence and severity are projected to increase in response to anthropogenic climate change, leading to fire regimes that may exceed the limits of tolerance for some species. Plants capable of regenerating from aerial shoots following high intensity fires, termed 'epicormic resprouters', are assumed to be resilient to changes in fire regimes. However, empirical tests of the response of epicormic resprouters to extreme fire regimes, such as repeated canopy fires at short intervals, are currently lacking. This study examined the effect of combinations of understorey fire and canopy fire across two successive wildfires (2007, 2013) on the resilience of eucalypts that resprout epicormically. The study took place in a temperate eucalypt forest in south eastern Australia. Measures used to infer community resilience included stem topkill and damage, and seedling recruitment. It was predicted that: (a) stems will exhibit lower resistance (i.e. increased topkill and damage) to canopy fire than understorey fire; (b) recruitment will be higher following canopy fire than understorey fire; (c) prior exposure to canopy fire will reduce stem resistance and recruitment in response to subsequent wildfires; and (d) stem resistance will vary depending on bark traits. Topkill of saplings and small stems (<30 cm diameter at breast height) was higher in sites that recently (i.e. 2013) experienced canopy fire as opposed to understorey fire. Recent fire severity had no effect on topkill of large trees. Tree species with dense bark on the main stem and larger branches were less prone to topkill or partial stem and branch mortality than species with fibrous bark or exposed branches. Seedling recruitment was greater following canopy fire than understorey fire. Exposure to past canopy fire (i.e. in 2007) did not decrease stem resistance or recruitment. Synthesis. The results of this study suggest that communities of eucalypts that can resprout epicormically following fire will experience demographic shifts following repeated canopy fires. However, given the high resistance of large trees and rapid post-fire recovery of the seedbank, ecosystem conversion appears unlikely. The findings support the presumption that forest communities of epicormic resprouters are highly resilient to shifts in fire regimes.


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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/143153
Appears in Collections:全球变化的国际研究计划

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作者单位: 1.La Trobe Univ, Dept Ecol Environm & Evolut, Bundoora, Vic, Australia
2.Arthur Rylah Inst Environm Res, Dept Environm Land Water & Planning, Heidelberg, Vic, Australia
3.La Trobe Univ, Res Ctr Future Landscapes, Bundoora, Vic, Australia

Recommended Citation:
Collins, Luke. Eucalypt forests dominated by epicormic resprouters are resilient to repeated canopy fires[J]. JOURNAL OF ECOLOGY,2019-01-01
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