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首页> 外文期刊>Journal of Vegetation Science >Vegetation and seed bank dynamics in a tidal freshwater marsh
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Vegetation and seed bank dynamics in a tidal freshwater marsh

机译：潮汐淡水沼泽中的植被和种子库动态

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QuestionsWhat are the feedbacks among the seed bank, parent vegetation, and landscape structure that control plant species turnover in space and time in a tidal freshwater marsh? How can these feedbacks be used to better understand marsh community dynamics and to establish restoration practices that seek to restore vegetation diversity of this important and widely distributed ecosystem?LocationPotomac River, Virginia, United States (15 km south of Washington, DC).MethodsWe sampled the seed bank and standing vegetation in a tidal freshwater marsh and explored similarities between seed bank and vegetation composition through space and time. We then investigated marsh surface elevation, distance to nearest tidal channels, and life history of component species as potential explanations for the observed vegetation patterns.ResultsThe composition of individual plots changed considerably from year to year; however, the composition at broader spatial (whole marsh) and temporal (4 years) scales was relatively stable. Species composition of the seed bank was dissimilar to both the previous and current year's standing vegetation, and similarity to standing vegetation was particularly low in plots dominated by annual species. Landscape structure and life history characteristics of individual species best explained the spatiotemporal variability in marsh vegetation.ConclusionsRestoration designs should be landscape-dependent and explicitly incorporate spatially structured elements such as elevation gradients to maximize community diversity in reconstructed tidal freshwater marshes. Optimal designs include areas of high seed input, areas of high species turnover, as well as other areas of greater stability.
机译：问题在潮汐淡水沼泽中，种子库，亲本植被和景观结构之间在空间和时间上控制植物物种更新的反馈是什么？如何利用这些反馈更好地了解沼泽生物群落动态并建立恢复实践，以期恢复这一重要且分布广泛的生态系统的植被多样性？地点美国弗吉尼亚州波托马克河（华盛顿特区以南15公里）。潮汐淡水沼泽中的种子库和站立的植被，并通过空间和时间探索了种子库与植被组成之间的相似性。然后，我们调查了沼泽地表的海拔高度，到最近的潮汐通道的距离以及组成物种的生活史，以作为观察到的植被格局的潜在解释。然而，在更广阔的空间（整个沼泽）和时间（4年）尺度上的组成相对稳定。种子库的物种组成与上一年和当年的常绿植被都不相同，在以一年生物种为主的地块中，与常绿植被的相似性特别低。结论物种的景观结构和生活史特征可以最好地解释沼泽植被的时空变化。结论复原设计应与景观有关，并明确纳入诸如海拔梯度之类的空间结构元素，以使潮汐淡水沼泽群落的多样性最大化。最佳设计包括高种子输入区域，高树种周转区域以及其他更高稳定性的区域。

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