当前位置: X-MOL 学术Forest Ecol. Manag. › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Bark insulation: Ten Central Alpine tree species compared
Forest Ecology and Management ( IF 3.7 ) Pub Date : 2020-10-01 , DOI: 10.1016/j.foreco.2020.118361
Andreas Bär , Stefan Mayr

Abstract Climate-driven increases in frequencies and intensities of wildfires will affect even relatively humid regions such as the Central Alps. During low- to moderate-intensity fires, the resistance of trees to fire is mainly determined by the insulation capability of their bark, which protects underlying tissues from lethal temperatures. However, the knowledge of fire resistance and bark heat insulation of Central Alpine species is scarce. In this study, the bark insulation capability of ten tree species was analyzed by bark surface heating experiments. Heat insulation was assessed by the time required to reach a lethal cambium temperature, linked to bark traits and analyzed with multivariate statistics. Our results revealed a strong overall relationship between bark thickness and cambial temperature responses, but also highlighted the role of bark density in insulating internal tissues. On a species level, additional bark traits, like moisture content, bark surface structure or bark thermal conductivity, contributed to the bark insulation capability. The bark insulation capability thus varied considerably between species. Identifying fire resistant species and knowledge of the traits determining species-specific bark insulation will help to better estimate impacts of fire disturbances and to face the challenge of an increased forest fire risk within the Alpine region.

中文翻译:

树皮绝缘:十种中央高山树种比较

摘要 气候驱动的野火频率和强度的增加甚至会影响到中部阿尔卑斯山等相对潮湿的地区。在中低烈度火灾中,树木的防火能力主要取决于其树皮的隔热能力,可保护下层组织免受致命温度的影响。然而,中高山树种的耐火和树皮隔热方面的知识很少。本研究通过树皮表面加热实验分析了十种树种的树皮保温能力。隔热性是通过达到致死形成层温度所需的时间来评估的,与树皮特性相关,并使用多变量统计数据进行分析。我们的结果揭示了树皮厚度和形成层温度响应之​​间的强烈整体关系,但也强调了树皮密度在绝缘内部组织中的作用。在物种水平上,额外的树皮特性,如水分含量、树皮表面结构或树皮导热性,有助于树皮绝缘能力。因此,树皮绝缘能力因物种而异。确定耐火物种和确定物种特定树皮绝缘特性的知识将有助于更好地估计火灾干扰的影响,并应对阿尔卑斯地区森林火灾风险增加的挑战。
更新日期:2020-10-01
down
wechat
bug