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首页> 外文期刊>Forest Ecology and Management >Comparing composition and structure in old-growth and harvested (selection and diameter-limit cuts) northern hardwood stands in Quebec.
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Comparing composition and structure in old-growth and harvested (selection and diameter-limit cuts) northern hardwood stands in Quebec.

机译：比较魁北克古树和采伐的北部硬木林的组成和结构（选择和限切）。

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Single-tree selection cutting is sometimes believed to be similar to the natural gap disturbance regime of hardwood forests, but few studies have specifically compared the compositional and structural characteristics of old-growth hardwood stands, undergoing natural gap dynamics and hardwood stands previously subjected to partial cuts. This study characterized and compared the composition (saplings and trees) and structure (gaps, foliage distribution, tree diameter and density, snags and coarse woody debris) of old-growth stands (OG), 12-year-old selection cuts (SC), and 28-33-year-old diameter-limit cuts (DLC) in sugar maple (Acer saccharum)-dominated northern hardwood stands in Quebec, Canada. Results showed marked structural differences between OG and harvested stands, with stronger differences between DLC and OG than between SC and OG. The synchronized formation of numerous canopy openings in harvested stands induced a massive post-harvest recruitment of advance regeneration in both SC and DLC that created a dense foliage layer in the understorey. Large living trees (dbh>39.1 cm) and defective trees were less numerous in SC than OG, which can have a detrimental impact on species dependent on these structural elements, and on the future availability and characteristics of coarse woody debris. Relatively few compositional differences were noticed among stand types, although a greater proportion of mid-tolerant species was found in the postharvest recruitment cohorts of harvested stands compared to OG, and a lower proportion of beech (Fagus grandifolia) saplings was observed in DLC compared to OG and SC. We argue that even if selection cutting is closer to the natural disturbance regime of hardwood forests than diameter-limit cutting, and therefore representing progress toward the development and implementation of a natural-disturbance-based management, a recurring application of selection cutting might lead to a homogenization of forest structure and composition, a reduction of key structural features and a reduction in biological diversity at both the stand and landscape scales. Some management recommendations are proposed..
机译：有时认为单树选择采伐与阔叶林的自然间隙干扰机制相似，但很少有研究专门比较过自然间隙动力学的硬木林和以前经历过部分砍伐的硬木林的组成和结构特征。削减。这项研究表征并比较了老龄林（OG），12年生选择林（SC）的成分（幼树和树木）和结构（间隙，枝叶分布，树木直径和密度，粗枝和粗木屑）。 ，以及在加拿大魁北克以糖枫（Acer saccharum）为主的北部硬木林中的28-33岁直径限制切口（DLC）。结果表明，OG和采伐林分之间存在明显的结构差异，DLC和OG之间的差异比SC和OG之间的差异更大。采伐林分中无数冠层开口的同步形成，导致在SC和DLC中大量的收获后募集了提前再生，从而在下层形成了茂密的树叶层。在南卡罗来纳州，大型活树（dbh> 39.1厘米）和有缺陷的树木少于OG，这对依赖于这些结构元素的树种以及未来粗木屑的可利用性和特征可能具有有害影响。尽管与OG相比，在收获后的林分采种后征候队列中发现了更多比例的中度耐性物种，但在林分类型中观察到的成分差异相对较少，而在DLC中观察到的山毛榉（Fagus grandifolia）树苗比例较低。 OG和SC。我们认为，即使选择采伐比直径限制采伐更接近硬木森林的自然扰动状态，因此代表着开发和实施基于自然干扰的管理的进展，选择采伐的重复应用可能会导致林分和景观尺度上的森林结构和组成均质化，关键结构特征的减少和生物多样性的减少。提出了一些管理建议。

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