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首页> 外文期刊>Open Journal of Ecology >Stand age structural dynamics of conifer, mixedwood, and hardwood stands in the boreal forest of central Canada
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Stand age structural dynamics of conifer, mixedwood, and hardwood stands in the boreal forest of central Canada

机译：加拿大中部寒带森林中针叶树，混合木和硬木林分的林分年龄结构动态

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摘要

To study the effects of stand development and overstory composition on stand age structure, we sampled 32 stands representing conifer, mixedwood, and hardwood stand types, ranging in ages from 72 to 201 years on upland mesic sites in northwestern Ontario. We defined the stages of stand development as: stem exclusion/canopy transition, canopy transition, canopy transition/gap dynamics, and gap dynamics. Stand age structure of conifer stands changed from bimodal, bimodal, reverse-J, and bimodal, respectively, through the stages of stand development. Mixedwood and hardwood stands revealed similar trends, with the exception of missing the canopy transition/gap dynamic stage in mixedwoods. Canopy transition/gap dynamic stage in hardwoods showed a weaker reverse-J distribution than their conifer counterparts. The results suggest that forest management activities such as partial and selection harvesting and seed-tree systems may diversify standard landscape-level age structures and benefit wildlife, hasten the onset of old-growth, and create desired stand age structures. We also recommend that the determination of old-growth using the following criteria in the boreal forest: 1) canopy breakdown of pioneering cohort is complete and stand is dominated by later successional tree species, and 2) stand age structure is bimodal, with dominating canopy trees that fall within a relatively narrow range of age and height classes and a significant amount of understory regeneration.
机译：为了研究林分发育和林分组成对林分年龄结构的影响，我们在安大略省西北部高地中生点采样了32种代表针叶树，混合木和硬木林分类型，年龄在72至201岁之间。我们将林分发育阶段定义为：茎排斥/冠层过渡，冠层过渡，冠层过渡/间隙动态和间隙动态。针叶林林分的年龄结构从林分发育的各个阶段分别从双峰，双峰，逆J和双峰转变。混合木和硬木林分显示出相似的趋势，只是缺少混合木的冠层过渡/间隙动态阶段。硬木的冠层过渡/间隙动态阶段显示出比针叶树对应弱的逆J分布。结果表明，森林管理活动，例如部分采伐和选择采伐以及种子树系统，可能使标准的景观年龄结构多样化，并使野生生物受益，加速老龄化的发生，并创造所需的林分年龄结构。我们还建议在北方森林中使用以下标准确定成年植物：1）先锋队的林冠完整完成，并且林分被后来的演替树种所占主导; 2）林分年龄结构是双峰的，占主导地位的林冠属于相对较窄的年龄和身高等级范围的树木，以及大量的林下植被再生。

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