DOI: 10.1016/j.foreco.2013.11.015
Scopus记录号: 2-s2.0-84890013405
论文题名: Insulation capacity of three bark types of temperate Eucalyptus species
作者: Wesolowski A. ; Adams M.A. ; Pfautsch S.
刊名: Forest Ecology and Management
ISSN: 0378-1127
出版年: 2014
卷: 313 起始页码: 224
结束页码: 232
语种: 英语
英文关键词: Australia
; Heat conductance
; Lethal temperature
; Periderm
; Surface fire
; Vascular cambium
Scopus关键词: Australia
; Heat conductance
; Lethal temperature
; Periderm
; Vascular cambium
; Atmospheric temperature
; Forestry
; Frost protection
; Moisture determination
; Fires
; accuracy assessment
; bark
; correlation
; empirical analysis
; forest fire
; mortality
; sensor
; species diversity
; thermal conductivity
; tree
; Australia
; Forestry
; Moisture
; Temperature
; Australia
英文摘要: Fire plays an increasingly important role in management of native forests and plantations around the world. Thick tree bark represents the most important defence against surface fires, although other bark traits (bark-type, moisture content, density) are also involved. The interplay of bark traits to reduce heat-induced cambium necrosis and related tree death remains poorly understood. Here we introduce a novel method using multiple sensors to accurately measure conductance of heat through the periderm and secondary phloem and to detect how individual bark traits influence the transfer of heat through those tissue types. We employed this method to document the capacity for bark insulation of three Eucalyptus species with different bark-type from temperate Australia, simulating a 'worst-case' scenario (750°C bark surface temperature for 900s). Thickness of these different bark types ranged from 3 to 65mm. Our results clearly show the importance of thickness and type of bark for prevention of cambium necrosis due to heat. Coefficients of determination that describe how bark thickness correlates with time to reach lethal temperatures (>60°C) at the cambium ranged from 0.61 (least effective: E. tricarpa, ironbark-type bark, average moisture content=34%, average bark density=0.58gcm-3) to 0.94 (most effective: E. leucoxylon, gum-type bark, average moisture content=54%, average bark density=0.42gcm-3) and both followed linear and curvilinear trajectories. The cooling effect of water in the periderm was found to slow conduction of heat towards the cambium. This effect has not previously been documented by empirical measurements and may have significant implications to survival of trees during "cooler" prescribed fires. Our study highlights between-species variation in ability to withstand heat from surface fires. Fire temperatures and duration thus have considerable capacity to change species composition of these Box-Ironbark forests via mortality. © 2013 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/66180
Appears in Collections: 影响、适应和脆弱性
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作者单位: Leibniz Universität Hannover, Institut für Botanik, Herrenhäuser Str. 2, 30419 Hannover, Germany; University of Sydney, Faculty of Agriculture and Environment, 1 Central Avenue, Eveleigh, 2015 NSW, Australia; University of Western Sydney, Hawkesbury Institute for the Environment, Locked Bag 1797, Penrith, 2751 NSW, Australia
Recommended Citation:
Wesolowski A.,Adams M.A.,Pfautsch S.. Insulation capacity of three bark types of temperate Eucalyptus species[J]. Forest Ecology and Management,2014-01-01,313