Climatic stress increases forest fire severity across the western United States
Climatic stress increases forest fire severity across the western United States
复制标题
DOI：
10.1111/ele.12151
复制
发表时间：
2013-09-01
期刊：
影响因子：
8.8
通讯作者：
Flint, Lorriane
中科院分区：
文献类型：
--
作者：
van Mantgem, Phillip J.;Nesmith, Jonathan C. B.;Flint, Lorriane
普遍的气候变暖会对林木造成长期压力，这可能会导致火灾造成的伤害造成的死亡。对美国西部森林地块的纵向分析表明，火灾前高的气候缺水与火灾后树木死亡概率的增加有关。在考虑了防火和伤害之后，气候和火之间的这种关系存在，并且似乎影响树冠和树干伤害的效果。气候和火的相互作用在不同的地理区域、主要属和树木大小之间没有显著差异。我们的发现支持了最近的生理学证据，表明干旱和来自火的加热都会损害木质部的传导性。变暖趋势与严重火灾天气和火灾蔓延的可能性增加有关；我们的结果表明，变暖也可能增加森林火灾的严重性(树木死亡的数量)，而不是与火灾强度(火灾期间释放的热量)无关。
Pervasive warming can lead to chronic stress on forest trees, which may contribute to mortality resulting from fire-caused injuries. Longitudinal analyses of forest plots from across the western US show that high pre-fire climatic water deficit was related to increased post-fire tree mortality probabilities. This relationship between climate and fire was present after accounting for fire defences and injuries, and appeared to influence the effects of crown and stem injuries. Climate and fire interactions did not vary substantially across geographical regions, major genera and tree sizes. Our findings support recent physiological evidence showing that both drought and heating from fire can impair xylem conductivity. Warming trends have been linked to increasing probabilities of severe fire weather and fire spread; our results suggest that warming may also increase forest fire severity (the number of trees killed) independent of fire intensity (the amount of heat released during a fire).