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首页> 外文期刊>Restoration ecology >Succession of Exotic and Native Species Assemblages within Restored Floodplain Forests: A Test of the Parallel Dynamics Hypothesis
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Succession of Exotic and Native Species Assemblages within Restored Floodplain Forests: A Test of the Parallel Dynamics Hypothesis

机译：恢复的洪泛区森林中外来物种和原生物种组合的演替：平行动力学假说的检验

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摘要

Exotic plants pose a threat to restoration success in post-agricultural bottomlands, but little information exists on their dynamics during succession of actively restored sites. We hypothesized that exotic assemblages would establish during succession and that their compositional trends during succession time would mirror those published for native species in other systems, with an early peak in herbaceous richness followed by a decline as woody species establish. In the summer of 2008, we sampled 16 sites across an 18-year chronosequence of restored forests, with an additional four mature forest stands for comparison, within the Cypress Creek NWR, Illinois, U.S.A. We identified all vascular plant species and quantified canopy openness at three canopy strata, and soil texture and chemistry. Trends in exotic assemblages were significantly correlated with canopy openness at all strata. Richness of exotic and native herbaceous species was related to stand age and consistent with a Weibull regression model. Native and exotic herbaceous cover followed an exponential decay model. Woody native richness over time conformed to a logistic model; woody exotics exhibited no relationship with stand age and were present in sites of all ages. Our results indicate that although their rates of decline differ, herbaceous exotics and natives exhibit similar successional dynamics; therefore, herbaceous exotics may not pose a lasting threat to restoration success in reforested floodplains. Woody exotics can establish across a range of successional stages and persist under closed canopy conditions. Bottomland restorations are vulnerable to the invasion and expansion of exotic plant species even after canopy closure.
机译：外来植物对后农业低地的恢复成功构成威胁，但是在积极恢复的遗址接连期间，关于其动态的信息很少。我们假设异国组合将在演替过程中建立，并且它们在演替期间的组成趋势将反映在其他系统中针对本地物种发表的那些趋势，其中草木丰富度的早期达到峰值，然后随着木本物种的建立而下降。在2008年夏季，我们在美国伊利诺伊州Cypress Creek NWR内，对18年恢复森林的时序变化中的16个地点进行了采样，并与另外四个成熟林进行比较，我们确定了所有维管束物种并量化了三个冠层，以及土壤质地和化学性质。外来组合的趋势与所有地层的冠层开放度显着相关。外来和本地草本物种的丰富度与林分年龄有关，并与Weibull回归模型一致。原生和外来草本覆盖遵循指数衰减模型。伍迪当地人的财富随着时间的流逝符合逻辑模型。木质外来物种与林分年龄没有关系，并且存在于各个年龄段。我们的结果表明，尽管它们的下降速度有所不同，但草本外来物种和本地人表现出相似的演替动态。因此，草本外来物种可能不会对造林后的洪泛区恢复成功构成持久威胁。伍迪外来生物可以在一系列演替阶段中建立并在封闭的树冠条件下持续存在。即使封盖后，底层植物的恢复也很容易受到外来植物物种的入侵和扩大。

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  • 来源
    《Restoration ecology》 |2012年第2期|p.202-210|共9页
  • 作者

    Craig R. McLane; Loretta L. Battaglia; David J. Gibson; John W. Groninger;

  • 作者单位

    Department of Plant Biology and Center for Ecology, Southern Illinois University, Carbondale, IL 62901-6509, U.S.A,PBS&J Corporation, PO Box 710, Yankton, SD 57078, U.S.A;

    Department of Plant Biology and Center for Ecology, Southern Illinois University, Carbondale, IL 62901-6509, U.S.A;

    Department of Plant Biology and Center for Ecology, Southern Illinois University, Carbondale, IL 62901-6509, U.S.A;

    Department of Forestry and Center for Ecology, Southern Illinois University, Carbondale, IL 62901, U.S.A;

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  • 正文语种 eng
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  • 关键词

    bottomland hardwoods; invasive species; restoration; succession;

    机译：低地硬木入侵物种;恢复;演替;

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