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The Influence of Western Spruce Budworm on Fire in Spruce-Fir Forests

机译：西部云杉芽虫对云杉杉木林火灾的影响

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摘要

Western spruce budworm (Choristoneura freemani Razowski; WSBW) is the most significant defoliator of coniferous trees in the western United States. Despite its important influence on Western forests, there are still gaps in our knowledge of WSBW’s impact on fire, and little research has been done on this relationship in high-elevation spruce-fir forests. Although this species is native to western North America, current outbreaks have persisted for many years in some areas, leading to high mortality rates among host tree species. Using the Fire and Fuels Extension of the Forest Vegetation Simulator (FFE-FVS), we examined the current and future impact of an ongoing WSBW outbreak on potential fire behavior in spruce-fir forests in northern New Mexico, USA. We found that this ongoing WSBW outbreak resulted in little to no difference in fire behavior under moderate fire weather conditions. Under high-severity fire weather conditions, stands enduring WSBW outbreaks experienced less severe fire behavior. We also found that WSBW outbreaks resulted in a decrease in fire behavior under severe fire weather conditions for 40 years following the outbreak.
机译：西部云杉芽虫（Choristoneura freemani Razowski; WSBW）是美国西部针叶树最重要的落叶树。尽管它对西方森林有重要影响，但我们对WSBW对火的影响的认识仍然存在差距，并且在高海拔云杉杉木林中对这种关系的研究很少。尽管该物种原产于北美西部，但当前的爆发在某些地区持续了多年，导致寄主树种的高死亡率。我们使用森林植被模拟器（FFE-FVS）的火与燃料扩展功能，研究了持续进行的WSBW爆发对美国新墨西哥州北部云杉杉木林潜在火灾行为的当前和未来影响。我们发现，这种持续性的WSBW爆发在中等火灾天气条件下的火灾行为几乎没有差异。在高强度火灾天气条件下，经久不衰的WSBW爆发的火灾行为较轻。我们还发现，WSBW暴发导致暴发后40年在严酷的火灾天气条件下的火灾行为减少。

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