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首页> 外文期刊>The American Midland Naturalist >Assessing Plant Community Changes Over Sixteen Years of Restoration in a Remnant Michigan Tallgrass Prairie
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Assessing Plant Community Changes Over Sixteen Years of Restoration in a Remnant Michigan Tallgrass Prairie

机译：在残留的密歇根州塔格拉斯草原草原上评估恢复后十六年的植物群落变化

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摘要

Evaluating the progress of ecological restoration projects is critical to improving our understanding of degraded ecosystems and their rehabilitation. In a remnant tallgrass prairie in southeast Michigan that is being managed by periodic dormant-season burns to reduce exotic species and increase native diversity, we tracked plant community changes in seven management units over a period of 16 y to evaluate ecological trajectory in the context of restoration goals. Factors that influenced compositional change from year to year were also assessed. We found that fire frequency, growing season temperature and growing season precipitation were correlated with the magnitude of year-to-year compositional change. Over the 16 y period, most management units decreased sharply in exotic species richness and abundance but did not increase appreciably in native species richness. Also, species evenness and native species abundance increased while total species richness decreased in most units. Over both spatial and temporal scales, the native C^sub 4^ grass Andropogon gerardii (big bluestem) was negatively correlated with species richness, likely because of competitive pressure from A. gerardii. Moreover, the direction of ecological trajectory, which diverged among management unite over time, was related to differences in the abundance of A. gerardii across the prairie. Ultimately, we concluded that although frequent fire was effective at maintaining prairie species and reducing exotic species, using fire as the only restoration tool was not effective at achieving a species-diverse prairie community. [PUBLICATION ABSTRACT]
机译：评估生态恢复项目的进度对于增进我们对退化的生态系统及其恢复的理解至关重要。在密歇根州东南部的一个残留的高草草原上，该草原通过定期的休眠季节烧伤来减少外来物种并增加本地多样性，我们在16年内跟踪了七个管理单位的植物群落变化，以评估在恢复目标。还评估了每年影响成分变化的因素。我们发现火灾频率，生长期温度和生长期降水与逐年成分变化的大小有关。在过去的16年中，大多数管理单位的外来物种丰富度和丰度都急剧下降，而本地物种丰富度却没有明显增加。此外，大多数单位的物种均匀度和原生物种丰度都增加了，而总物种丰富度却下降了。在空间和时间尺度上，本地C ^ sub 4 ^草Andropogon gerardii（大蓝茎）与物种丰富度呈负相关，这可能是由于来自A.gerardii的竞争压力。而且，随着时间的流逝，生态轨迹的方向在管理单位之间也有所不同，这与整个草原上的A. gerardii的丰度差异有关。最终，我们得出结论，尽管频繁发生火灾对维持草原物种和减少外来物种有效，但使用火作为唯一的恢复工具对建立物种多样化的草原社区无效。 [出版物摘要]

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    《The American Midland Naturalist》 |2010年第2期|p.322-336|共15页
  • 作者

    Justin L Heslinga Robert E Grese;

  • 作者单位

    JUSTIN L. HESLINGA AND ROBERT E. GRESESchool of Natural Resources and Environment, University of Michigan, 440 Church Street, Ann Arbor 48109;

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