Local forest structure variability increases resilience to wildfire in dry western U.S. coniferous forests.,Ecology Letters

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Local forest structure variability increases resilience to wildfire in dry western U.S. coniferous forests.
Ecology Letters ( IF 7.6 ) Pub Date : 2020-01-10 , DOI: 10.1111/ele.13447
Michael J Koontz _{1,

2,

3} , Malcolm P North _{2,

4} , Chhaya M Werner _{2,

5,

6} , Stephen E Fick _{7,

8} , Andrew M Latimer ₂

Affiliation

A 'resilient' forest endures disturbance and is likely to persist. Resilience to wildfire may arise from feedback between fire behaviour and forest structure in dry forest systems. Frequent fire creates fine-scale variability in forest structure, which may then interrupt fuel continuity and prevent future fires from killing overstorey trees. Testing the generality and scale of this phenomenon is challenging for vast, long-lived forest ecosystems. We quantify forest structural variability and fire severity across >30 years and >1000 wildfires in California's Sierra Nevada. We find that greater variability in forest structure increases resilience by reducing rates of fire-induced tree mortality and that the scale of this effect is local, manifesting at the smallest spatial extent of forest structure tested (90 × 90 m). Resilience of these forests is likely compromised by structural homogenisation from a century of fire suppression, but could be restored with management that increases forest structural variability.

中文翻译：

局部森林结构的变化性提高了美国西部针叶林的干旱对野火的抵抗力。

“有弹性”的森林会遭受干扰，并且可能会持续存在。在野火系统中，火灾行为和森林结构之间的反馈可能会提高野火的抵抗力。频繁发生的火灾会在森林结构中造成大规模的变化，从而可能会中断燃料的连续性，并防止未来的火灾杀死高耸的树木。对这种现象的普遍性和规模进行测试，对于广阔的，长期存在的森林生态系统而言具有挑战性。我们对加利福尼亚内华达山脉> 30年和超过1000次野火的森林结构变异性和火灾严重性进行了量化。我们发现，森林结构的更大变异性通过降低火灾引起的树木死亡率而增加了复原力，并且这种影响的规模是局部的，表现在所测试森林结构的最小空间范围内（90×90 m）。

更新日期：2020-01-11

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