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首页> 外文期刊>Northeastern Naturalist >Stand Dynamics and Structure of Two Primary Champlain Valley Clayplain Forests, Vermont
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Stand Dynamics and Structure of Two Primary Champlain Valley Clayplain Forests, Vermont

机译：佛蒙特邦两次主要尚普兰山谷克莱普林林的立场动态与结构

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摘要

Understanding natural forest dynamics is critical for informing forest restoration and conservation efforts. However, such information is often difficult to generate for areas that have a long history of intense land use, such as the Champlain Valley of Vermont. We used dendroecological methods and assessments of forest structural conditions to describe the tree recruitment history and structural dynamics of 2 examples of valley clayplain forest, a rare natural community that has been drastically reduced in extent by agricultural land use in the Champlain Valley. Although historic selective harvesting had occurred in the areas sampled, these sites represent the best remaining examples of semi- natural valley clayplain forests in the region, thus providing an opportunity to document long- term patterns of structural and compositional conditions and tree recruitment in areas with limited land- use. Age structures in these 2 areas were strongly uneven-aged, with older cohorts composed of Quercus alba (White Oak), including an individual dating to the 1640s, and recruitment over the past 2 centuries dominated by Tsuga canadensis (Eastern Hemlock). Size distributions of live trees also reflected these patterns of recruitment, with White Oak occurring exclusively in larger diameter classes (> 35 cm) and Eastern Hemlock predominating across all smaller size classes. We observed sparse regeneration of Quercus spp. (oaks) in these areas, suggesting that this historically important component of valley clayplain forests may disappear over time in the absence of large, stand- scale natural disturbances or management activities focused on the perpetuation of this species group.
机译：了解自然森林动态对于通知森林恢复和保护努力至关重要。然而，这种信息往往难以为具有巨大的土地使用历史的区域产生，例如佛蒙特州的尚普兰谷。我们使用了森林结构条件的分列方法和评估，描述了谷克莱普林森林的2个例子的树招生历史和结构动态，这是一种罕见的自然社区，在尚普兰谷的农业土地使用程度方面已经大幅减少。虽然在取样的地区发生了历史选择性收获，但这些网站代表了该地区半自然谷克莱普林森林的最佳实例，从而提供了在与有限的土地使用。这2个地区的年龄结构强烈不均匀，具有由栎（白橡木）的旧群组组成，包括约会到160年代的个人，并在过去的2世纪中招聘，由Tsuga Canadensis（东部铁杉）为主。现场树的尺寸分布也反映了这些招聘模式，用白色橡木在更大直径的级别（> 35厘米）和占主导地位的全部较小尺寸等级中。我们观察到Quercus SPP的稀疏再生。 （橡树）在这些领域，这表明这一历史上谷族森林的重要组成部分可能会随着时间的推移而消失，缺乏大规模的自然骚乱或管理活动，专注于该物种群体的永久性。

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