Great Lakes Vegetation Dynamics: The Role of Fluctuating Water Levels and Buried Seeds
Great Lakes Vegetation Dynamics: The Role of Fluctuating Water Levels and Buried Seeds
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DOI：
10.1016/s0380-1330(86)71697-3
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发表时间：
1986
影响因子：
2.2
通讯作者：
P. Keddy;A. Reznicek
中科院分区：
文献类型：
--
作者：
P. Keddy;A. Reznicek
本研究的目的是回顾五大湖水位波动与岸线植被动态之间的关系。低水期允许许多植物物种和植被类型从埋藏的种子中再生。对已发表的种子库密度的回顾表明，一些湖岸的埋藏种子密度大于104粒m−2，比草原沼泽的密度高一个数量级。高水期会杀死优势物种（如斑疹伤寒），从而在低水期造成空隙，使其他物种可以在此定居。高水位还会杀死木本植物，从而使沼泽向陆地延伸。因此，波动的水位增加了岸线植被的面积，增加了植被类型和植物种类的多样性。任何稳定的水位都可能减少沼泽面积、植被多样性和植物物种多样性。可以识别出4种基本的岸线植被类型（森林和灌木灌丛、湿草甸、沼泽和水生）；湿润的草甸和沼泽在很大程度上都是水位波动的结果。
The objective of this study was to review the relationship between fluctuating water levels and shoreline vegetation dynamics in the Great Lakes. Low water periods allow many plant species and vegetation types to regenerate from buried seeds. A review of published seed bank densities shows that some lakeshores have densities of buried seeds greater than l04seeds m−2, an order of magnitude greater than densities reported from prairie marshes. High water periods kill dominant species (e.g.,Typhasp.), thereby creating gaps which other species can colonize during low water periods. High water also kills woody plants, thereby extending marshes landward. Fluctuating water levels therefore increase the area of shoreline vegetation, and the diversity of vegetation types and plant species. Any stabilization of water levels would likely reduce marsh area, vegetation diversity, and plant species diversity. Four basic shoreline vegetation types (forest and shrub thickets, wet meadow, marsh, and aquatic) can be recognized; both wet meadow and marsh largely result from fluctuating water levels.