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Understorey Vegetation Stability and Dynamics in Unmanaged Boreal Forests Along a Deposition Gradient in Sweden

机译：瑞典沉积梯度下未管理的北方森林地下植被的稳定性和动力学

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摘要

The aims of this study were to investigate spatial patterns and temporal changes in understorey vegetation at four forest catchments forming a depositional gradient. Inventories of the bottom and field layers were carried out in the 1990s and repeated after 5–14 years, depending on catchment. It was hypothesized that changes and patterns in ground vegetation would be related to changes and patterns in N and S deposition. The data were analyzed using Ellenberg indices and multivariate methods. All catchments showed temporal changes in species composition. Analyses of the bottom layer were confounded by a change of field staff, but after accounting for this observer effect, differences in species composition between the catchments remained. Within catchments, the changes in species composition were unrelated to N or S deposition. Relationships between environmental factors, expressed as Ellenberg indices, and compositional patterns differed between catchments although Ellenberg indices showed small temporal changes.
机译：这项研究的目的是调查形成沉积梯度的四个森林集水区地下植被的空间格局和时间变化。底层和田间层的清查工作于1990年代进行，并在5-14年后重复进行，具体取决于流域。据推测，地面植被的变化和格局将与氮和硫沉积的变化和格局有关。使用Ellenberg指数和多元方法分析数据。所有流域均显示物种组成随时间变化。底层人员的分析由于现场人员的变化而混淆，但是在考虑了这种观察者效应之后，流域之间物种组成的差异仍然存在。在流域内，物种组成的变化与氮或硫的沉积无关。尽管Ellenberg指数显示出较小的时间变化，但流域之间环境因素之间的关系（以Ellenberg指数表示）与组成模式之间存在差异。

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