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首页> 美国卫生研究院文献>Ecology and Evolution >Linking radial growth patterns and moderate‐severity disturbance dynamics in boreal old‐growth forests driven by recurrent insect outbreaks: A tale of opportunities successes and failures
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Linking radial growth patterns and moderate‐severity disturbance dynamics in boreal old‐growth forests driven by recurrent insect outbreaks: A tale of opportunities successes and failures

机译：通过复发性昆虫爆发驱动的北方老生长林中的径向生长模式和中等严重程度扰动动态：机遇成功和失败的故事

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In boreal landscapes, emphasis is currently placed on close‐to‐nature management strategies, which aim to maintain the biodiversity and ecosystem services related to old‐growth forests. The success of these strategies, however, depends on an accurate understanding of the dynamics within these forests. While moderate‐severity disturbances have recently been recognized as important drivers of boreal forests, little is known about their effects on stand structure and growth. This study therefore aimed to reconstruct the disturbance and postdisturbance dynamics in boreal old‐growth forests that are driven by recurrent moderate‐severity disturbances. We studied eight primary old‐growth forests in Québec, Canada, that have recorded recurrent and moderately severe spruce budworm (Choristoneura fumiferana [Clem.]) outbreaks over the 20th century. We applied an innovative dendrochronological approach based on the combined study of growth patterns and releases to reconstruct stand disturbance and postdisturbance dynamics. We identified nine growth patterns; they represented trees differing in age, size, and canopy layer. These patterns highlighted the ability of suppressed trees to rapidly fill gaps created by moderate‐severity disturbances through a single and significant increase in radial growth and height. Trees that are unable to attain the canopy following the disturbance tend to remain in the lower canopy layers, even if subsequent disturbances create new gaps. This combination of a low stand height typical of boreal forests, periodic disturbances, and rapid canopy closure often resulted in stands constituted mainly of dominant and codominant trees, similar to even‐aged forests. Overall, this study underscored the resistance of boreal old‐growth forests owing to their capacity to withstand repeated moderate‐severity disturbances. Moreover, the combined study of growth patterns and growth release demonstrated the efficacy of such an approach for improving the understanding of the fine‐scale dynamics of natural forests. The results of this research will thus help develop silvicultural practices that approximate the moderate‐severity disturbance dynamics observed in primary and old‐growth boreal forests.
机译：在北方景观中，强调目前处于近乎自然的管理策略，旨在维持与老年生长林相关的生物多样性和生态系统服务。然而，这些策略的成功取决于准确地了解这些森林内的动态。虽然最近被认为是北方森林的重要驱动因素，但对其对立场结构和增长的影响知之甚少。因此，本研究旨在重建北方旧生长林中的干扰和后视动力，这些森林由经常性中等严重程度紊乱驱动。我们研究了加拿大魁北克的八个初级旧成长林，记录了复发和中度严重的云芽（Choristoneura Fumiferana [Clem。]）爆发。我们基于增长模式的组合研究应用了一种创新的树突论方法，并释放重建静止干扰和后视动力学。我们确定了九个生长模式;它们代表了年龄，大小和遮篷层不同的树木。这些模式突出了抑制树木快速填充通过单一和显着的径向生长和高度的严重程度扰动创造的差距的能力。即使随后的干扰产生新的间隙，扰动后无法达到扰动后无法达到冠层的树木。这种低支架高度的典型巨型森林，周期性扰动和快速冠层封闭的组合通常导致展台主要是主导和复古树木，类似于偶数森林。总体而言，这项研究强调了北方老生长森林的阻力，因为它们承受重复的中等严重性障碍的能力。此外，生长模式和生长释放的组合研究表明了这种方法改善了改善自然林的微尺度动态的理解的效果。因此，该研究的结果将有助于开发造林实践，即近似在旧生群森林中观察到的中等严重程度扰动动态。

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