在加拿大不列颠哥伦比亚省,特大火灾形成了不同森林的火灾严重程度模式

IF 2.9 3区 环境科学与生态学 Q2 ECOLOGY
Ecosphere Pub Date : 2025-08-12 DOI:10.1002/ecs2.70364
L. Collins, K. Morrison, M. S. Buonanduci, L. Guindon, B. J. Harvey, M.-A. Parisien, S. Taylor, E. Whitman
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引用次数: 0

摘要

变暖和干燥的环境导致加拿大不列颠哥伦比亚省森林野火的规模和年燃烧面积增加。由于缺乏对火灾严重程度同时变化的研究,火灾活动增加对这些森林的影响仍不清楚。在这里,我们使用1986年至2021年的火灾严重性地图,评估了火灾严重程度模式如何随着不列颠哥伦比亚省生物区域野火规模的扩大而变化。首先,我们研究了特大火灾(即最大的5%火灾)的趋势及其对年燃烧面积的影响;然后,我们检查了野火规模和火灾严重程度之间的比例关系,以确定特大火灾是否比小火灾更严重。极大的火灾解释了年燃烧面积的大部分变化,并占整个研究区域累积燃烧面积的很大比例(33%-71%)。因此,特大火灾规模的变化,在我们的研究期间增加了一个数量级,推动了每年燃烧面积的大幅增加。尺度关系表明,规模较大的山火比规模较小的山火构成更大、更均匀的高烈度火灾斑块,导致高烈度火灾对火灾范围的比例贡献更大。所有生物区域的尺度关系模式在质量上相似,表明火灾制度的变化在全省范围内普遍存在。我们的研究结果表明,最近在不列颠哥伦比亚省的森林中,极端野火规模的增加导致了燃烧面积的急剧增加,这与高严重性火灾斑块的规模和范围的不成比例的增加有关。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Extremely large fires shape fire severity patterns across the diverse forests of British Columbia, Canada

Extremely large fires shape fire severity patterns across the diverse forests of British Columbia, Canada

Extremely large fires shape fire severity patterns across the diverse forests of British Columbia, Canada

Extremely large fires shape fire severity patterns across the diverse forests of British Columbia, Canada

Extremely large fires shape fire severity patterns across the diverse forests of British Columbia, Canada

Extremely large fires shape fire severity patterns across the diverse forests of British Columbia, Canada

Warming and drying conditions are driving increases in wildfire size and annual area burned across the forests of British Columbia, Canada. The impact of increasing fire activity on these forests remains unclear as examination of concurrent changes to fire severity is lacking. Here, we assess how fire severity patterns change with the amplification of wildfire size across the bioregions of British Columbia using fire severity mapping from 1986 to 2021. First, we examine trends in extremely large fires (i.e., largest 5% of fires) and their influence on annual area burned; then we examine scaling relationships between wildfire size and fire severity to determine if extremely large fires are more severe than smaller fires. Extremely large fires explained much of the variation in annual area burned and accounted for a large proportion of cumulative area burned (33%–71%) across the study area. Consequently, shifts in the size of extremely large fires, which increased by an order of magnitude over our study period, have driven a substantial increase in annual area burned. Scaling relationships revealed that bigger wildfires consisted of larger and more homogenous patches of high-severity fire than smaller fires, resulting in a greater proportional contribution of high-severity fire to fire extent. Patterns in scaling relationships were qualitatively similar for all bioregions, indicating shifts in fire regimes are widespread across the province. Our results demonstrate that recent increases in the extremes of wildfire size across the forests of British Columbia have driven a sharp increase in area burned, which was associated with a disproportionate increase in the size and extent of patches of high-severity fire.

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来源期刊
Ecosphere
Ecosphere ECOLOGY-
CiteScore
4.70
自引率
3.70%
发文量
378
审稿时长
15 weeks
期刊介绍: The scope of Ecosphere is as broad as the science of ecology itself. The journal welcomes submissions from all sub-disciplines of ecological science, as well as interdisciplinary studies relating to ecology. The journal''s goal is to provide a rapid-publication, online-only, open-access alternative to ESA''s other journals, while maintaining the rigorous standards of peer review for which ESA publications are renowned.
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