Long‐term effects of prairie restoration on plant community structure and native population dynamics
Long‐term effects of prairie restoration on plant community structure and native population dynamics
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草原恢复对植物群落结构和本地种群动态的长期影响
DOI：
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发表时间：
2017
期刊：
影响因子：
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通讯作者：
Jennifer L. Williams
中科院分区：
文献类型：
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作者：
C. Trowbridge;A. Stanley;T. Kaye;P. Dunwiddie;Jennifer L. Williams
恢复退化草原生境的关键是确定可行和有效的技术，以减少外来物种的负面影响，促进自我维持的本地种群。通常很难扩展对恢复工作的监测以评估长期成功，但这样做对于了解初始结果如何随时间变化至关重要。为了评估最初的治疗效果如何持续，我们在实验恢复工作停止后6年重新访问了太平洋西北部草原栖息地的退化斑块。我们评估了植物群落组成，以确定补充本地播种和干扰处理（燃烧，割草，除草剂，以减少外来物种）的持久影响。我们跟踪了种子物种的持久性，并测量了其种群的扩散，以评估物种恢复的适宜性和栖息地支持本地植物种群的能力。我们发现，地块，收到补充播种继续表现出更高的本地物种比那些留下未播种的丰富度，播种和干扰处理可以积极影响本地物种丰富度在长期内。最初观察到的干扰处理对减少外来草丰富度的影响已经减弱，突出了长期监测和持续控制外来物种的重要性。然而，这些治疗显着影响的人口轨迹的8个种子本地物种。有证据表明，大多数种子物种的空间推进。从长期监测的结果证实，本地物种的扩散限制和困难，保持减少外来草仍然是主要的障碍，成功恢复入侵草原。
The key to restoring degraded grassland habitats is identifying feasible and effective techniques to reduce the negative impacts of exotic species and promote self‐sustaining native populations. It is often difficult to extend monitoring of restoration efforts to evaluate long‐term success, but doing so is essential to understanding how initial outcomes change over time. To assess how initial treatment effects persist, we revisited degraded patches of Pacific Northwest prairie habitat 6 years after experimental restoration efforts ceased. We evaluated plant community composition to determine the lasting effects of supplemental native seeding and disturbance treatments (burning, mowing, and herbicide to reduce exotic species). We tracked the persistence of seeded species and measured spread of their populations to evaluate suitability of species for restoration and the ability of the habitat to support native plant populations. We found that plots that received supplemental seeding continued to exhibit higher richness of native species than those left unseeded, and that both seeding and disturbance treatments could positively influence native species abundance over the long term. The initially observed effects of disturbance treatments on reducing exotic grass abundance had diminished, highlighting the importance of long‐term monitoring and ongoing control of exotic species. Nevertheless, these treatments significantly influenced the population trajectories of 4 out of 8 seeded native species. There was evidence of spatial advance of most seeded species. Results from extended monitoring confirm that dispersal limitation of native species and difficulties maintaining the reduction of exotic grasses continue to be major barriers to success in restoration of invaded grasslands.