The initiation of fire spread in shrubland fuels recreated in the laboratory
The initiation of fire spread in shrubland fuels recreated in the laboratory
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DOI：
10.1071/wf09038
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发表时间：
2010-07
影响因子：
3.1
通讯作者：
M. Plucinski;W. Anderson;R. Bradstock;A. Gill
中科院分区：
文献类型：
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作者：
M. Plucinski;W. Anderson;R. Bradstock;A. Gill
易发火灾的灌木为主的植被群落覆盖了澳大利亚相当大的一部分，包括城市发展的边缘地区。在城市界面附近，它们被积极地管理为规定的火灾，以减少野火（计划外火灾）的风险。对允许火灾蔓延或无法蔓延的条件范围的了解是有限的，这可能会给火灾管理人员在进行规定的燃烧时带来不便。在室内重建的微型灌丛中进行了一系列点火实验，研究了影响点火阈值的因素。在不同的含水量和密度条件下制备了小型灌丛。还调查了灌木空中结构中死燃料的影响，以及有无风和凋落物的影响。利用逻辑回归分析和分类树模型确定了传播起始的最重要因素。发现凋落物的存在、活燃料的含水量、灌木层密度、风的存在以及死燃料的数量和连续性都影响传播的可持续性。灌丛层密度与活燃料含水率呈负交互作用，表明含水率越高，密度的影响越小。
Fire-prone shrub-dominated vegetation communities cover a considerable portion of Australia, including areas fringing urban development. Near urban interfaces, they are actively managed with prescribed fire to reduce the risk of wildfire (unplanned fire). Knowledge of the range of conditions that allow fires to spread or fail to do so is limited and can inconvenience fire managers when conducting prescribed burns. A series of experimental ignitions conducted in miniature shrublands reconstructed in the laboratory were used to investigate factors that influence ignition thresholds. The miniature shrublands were composed of foliage from the shrub Allocasuarina nana and were prepared over a range of moisture contents and densities. The impact of dead fuel within the aerial structure of the shrubs was also investigated, as was the presence and absence of wind and litter. The most important factors for spread initiation were identified using logistic regression analysis and classification tree modelling. The presence of litter, live fuel moisture content, shrub-layer density, presence of wind, and the amount and continuity of the dead elevated fuel were all found to influence spread sustainability. There was a negative interaction between shrub-layer density and live fuel moisture content, showing the effect of density to be less at higher moisture contents.