DOI: 10.1016/j.foreco.2016.08.047
Scopus记录号: 2-s2.0-84985947336
论文题名: Mortality and recruitment of fire-tolerant eucalypts as influenced by wildfire severity and recent prescribed fire
作者: Bennett L.T. ; Bruce M.J. ; MacHunter J. ; Kohout M. ; Tanase M.A. ; Aponte C.
刊名: Forest Ecology and Management
ISSN: 0378-1127
出版年: 2016
卷: 380 起始页码: 107
结束页码: 117
语种: 英语
英文关键词: Fire severity
; Prescribed burning
; Regeneration
; Resprouter
; Temperate forest
; Tree mortality
Scopus关键词: Fire resistance
; Forestry
; Reforestation
; Fire severity
; Prescribed burning
; Regeneration
; Resprouter
; Temperate forests
; Tree mortality
; Fires
; biomass burning
; dominance
; ecosystem resilience
; empirical analysis
; evergreen tree
; forest management
; mortality
; recruitment (population dynamics)
; regeneration
; temperate forest
; tolerance
; understory
; wildfire
; Australia
英文摘要: Mixed-species eucalypt forests of temperate Australia are assumed tolerant of most fire regimes based on the impressive capacity of the dominant eucalypts to resprout. However, empirical data to test this assumption are rare, limiting capacity to predict forest tolerance to emerging fire regimes including more frequent severe wildfires and extensive use of prescribed fire. We quantified tree mortality and regeneration in mixed-species eucalypt forests five years after an extensive wildfire that burnt under extreme fire weather. To examine combined site-level effects of wildfire and prescribed fire, our study included factorial replications of three wildfire severities, assessed as crown scorch and understorey consumption shortly after the wildfire (Unburnt, Low, High), and two times since last preceding fire (<10 years since prescribed fire, >30 years since any fire). Our data indicate that while most trees survived low-severity wildfire through epicormic resprouting, this capacity was tested by high-severity wildfire. Five years after the wildfire, percentage mortalities of eucalypts in all size intervals from 10 to >70 cm diameter were significantly greater at High severity than Unburnt or Low severity sites, and included the near loss of the 10–20 cm cohort (93% mortality). Prolific seedling regeneration at High severity sites, and unreliable basal resprouting, indicated the importance of seedling recruitment to the resilience of these fire-tolerant forests. Recent prescribed fire had no clear effect on forest resistance (as tree survival) to wildfire, but decreased site-level resilience (as recruitment) by increasing mortalities of small stems. Our study indicates that high-severity wildfire has the potential to cause transitions to more open, simplified stand structures through increased tree mortality, including disproportionate losses in some size cohorts. Dependence on seedling recruitment could increase vulnerabilities to subsequent fires and future climates, potentially requiring direct management interventions to bolster forest resilience. © 2016 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/64695
Appears in Collections: 影响、适应和脆弱性
There are no files associated with this item.
作者单位: School of Ecosystem and Forest Sciences, The University of Melbourne, 4 Water Street, Creswick, Victoria, Australia; Arthur Rylah Institute for Environmental Research, Department of Environment, Land, Water and Planning, 123 Brown Street, Heidelberg, Victoria, Australia; School of Ecosystem and Forest Sciences, The University of Melbourne, 500 Yarra Boulevard, Richmond, Victoria, Australia
Recommended Citation:
Bennett L.T.,Bruce M.J.,MacHunter J.,et al. Mortality and recruitment of fire-tolerant eucalypts as influenced by wildfire severity and recent prescribed fire[J]. Forest Ecology and Management,2016-01-01,380