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Long-Term Effects of Fuel Reduction Treatments on Surface Fuel Loading in the Blue Mountains of Oregon
Forests ( IF 2.4 ) Pub Date : 2021-09-25 , DOI: 10.3390/f12101306
Kat E. Morici , John D. Bailey

Fire exclusion and a lengthening fire season has resulted in an era of megafires. Fuel reduction treatments in forested ecosystems are designed to guard against future extreme wildfire behavior. Treatments create a heterogenous landscape and facilitate ecosystem function and resilience in fire-adapted forests of the western United States. Despite widespread recognition that repeated fuel treatments are needed to maintain desired stand characteristics over time, few field studies have evaluated treatment longevity. The Blue Mountains Fire and Fire Surrogate site in northeastern Oregon presented an opportunity to investigate woody fuel loading 15–17 years after four treatments: mechanical thin, prescribed burn, both thin and burn, and no treatment control. The principal findings were: (1) fine fuel load 15 years post-burn remained slightly below pre-treatment values; (2) rotten coarse fuel load was reduced post-burn, but sound coarse fuel was not altered by any active treatment; and (3) total woody fuel load 15–17 years post-treatment was similar to pre-treatment values. Understanding surface fuel loading is essential for predicting fire behavior. Overall, the effects of fuel reduction treatments on woody surface fuels were transitory in dry mixed conifer forests. Frequent maintenance treatments are recommended to protect values at risk in areas with high fire hazards. Quantifying the persistence of changes in forest conditions aids in the planning and analysis of future fuel treatments, along with scheduling maintenance of existing treated areas.

中文翻译:

燃料减少处理对俄勒冈州蓝山地表燃料装载量的长期影响

火灾排除和延长的火灾季节导致了一个巨大的火灾时代。森林生态系统中的燃料减少处理旨在防止未来的极端野火行为。处理创造了一个异质的景观,并促进了美国西部适应火灾的森林的生态系统功能和恢复力。尽管人们普遍认识到需要重复燃料处理以随着时间的推移保持所需的林分特性,但很少有实地研究评估处理寿命。位于俄勒冈州东北部的蓝山火灾和火灾替代站点提供了一个机会,可以在四种处理后 15-17 年调查木质燃料负荷:机械稀释、规定的燃烧、稀释和燃烧以及无处理控制。主要发现是:(1) 燃烧后 15 年的精细燃料负荷仍略低于预处理值;(2) 燃烧后腐烂的粗燃料负荷减少,但任何积极的处理都没有改变健全的粗燃料;(3) 处理后 15-17 年的总木质燃料负荷与预处理值相似。了解表面燃料负荷对于预测火灾行为至关重要。总体而言,燃料减少处理对木质表面燃料的影响在干混针叶林中是短暂的。建议经常进行维护处理,以保护高火灾危险区域的危险值。量化森林条件变化的持续性有助于规划和分析未来的燃料处理,以及对现有处理区域的维护安排。但任何积极的处理都没有改变健全的粗燃料;(3) 处理后 15-17 年的总木质燃料负荷与预处理值相似。了解表面燃料负荷对于预测火灾行为至关重要。总体而言,燃料减少处理对木质表面燃料的影响在干混针叶林中是短暂的。建议经常进行维护处理,以保护高火灾危险区域的危险值。量化森林条件变化的持续性有助于规划和分析未来的燃料处理,以及对现有处理区域的维护安排。但任何积极的处理都没有改变健全的粗燃料;(3) 处理后 15-17 年的总木质燃料负荷与预处理值相似。了解表面燃料负荷对于预测火灾行为至关重要。总体而言,燃料减少处理对木质表面燃料的影响在干混针叶林中是短暂的。建议经常进行维护处理,以保护高火灾危险区域的危险值。量化森林条件变化的持续性有助于规划和分析未来的燃料处理,以及对现有处理区域的维护安排。了解表面燃料负荷对于预测火灾行为至关重要。总体而言,燃料减少处理对木质表面燃料的影响在干混针叶林中是短暂的。建议经常进行维护处理,以保护高火灾危险区域的危险值。量化森林条件变化的持续性有助于规划和分析未来的燃料处理,以及对现有处理区域的维护安排。了解表面燃料负荷对于预测火灾行为至关重要。总体而言,燃料减少处理对木质表面燃料的影响在干混针叶林中是短暂的。建议经常进行维护处理,以保护高火灾危险区域的危险值。量化森林条件变化的持续性有助于规划和分析未来的燃料处理,以及对现有处理区域的维护安排。
更新日期:2021-09-27
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