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首页> 外文期刊>Ecological engineering: The Journal of Ecotechnology >Dismantling artificial levees and channel revetments promotes channel widening and regeneration of riparian vegetation over long river segments
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Dismantling artificial levees and channel revetments promotes channel widening and regeneration of riparian vegetation over long river segments

机译：拆除人工堤坝和渠道修饰促进了长江段河岸植被的渠道扩大和再生

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Longitudinal structures manipulation can re-activate channel migration and thus restore flood-dependent riparian plant communities in human-constrained floodplains. However, it has been rarely implemented over long restored river segments and has been infrequently assessed while taking into account river conditions prior to restoration. This study describes the morphological and vegetation response to this type of restoration in a project completed in 2012 along a 21.6 km river segment in the Orbigo River (NW Spain). Land cover changes and channel planform evolution in the restored segment were compared with a downstream non-restored (control) segment and to an upstream unregulated (reference) segment before (2011) and shortly after (2014) the restoration implementation. Riparian vegetation was surveyed in 18 gravel bars of the three river segments four years after restoration completion (2016). The restored segment presented the largest increase of active channel area. Rejuvenation of landforms predominated over transition toward mature stages (succession) in the restored and the reference segment, while succession predominated in the control segment. The sinuosity and braiding indexes in the restored segment increased much more than in the reference and, especially, than in the control segment. Riparian plant communities that colonized gravel bars in the restored segment resembled those found in the unregulated segment and slightly differed from that found in the non-restored segment. Withinsegment variability was much higher, indicating the dependence of riparian plant communities on local processes. Although positive, our results showed that the high stability of floodplain areas in the human-constrained rivers of industrialized societies limits the short-term effectiveness of longitudinal structures manipulation as a restoration strategy. We also showed that assessments using relatively simple aerial photointerpretation and vegetation surveys in pioneer habitats can illustrate trajectories in river restoration projects shortly after their completion. Long-term monitoring of the geomorphic trajectory and associated plant communities, however, will help define the timing of future additional interventions to assure the natural resilience of riparian habitats.
机译：纵向结构操纵可以重新激活信道迁移，从而恢复人类受限的洪水平均洪水植物社区。然而，它已经很少在长期恢复的河段实施，并且在恢复之前考虑到河流条件时已经不经常评估。本研究描述了在2012年在2012年完成的项目沿2012年在Orbigo河（NW Spain）的21.6 km河段内完成的项目中这种恢复的形态和植被反应。抵制段中的陆地覆盖变化和频道平面形式演变与下游不恢复（控制）分部以及（2011年）之前的上游不受管的（参考）分部进行比较，并在（2014）后不久“修复实施”。在恢复完成后，在三个河段的18个砾石条中调查了河岸植被（2016年）。恢复的部分呈现了最大的有效渠道区域的增加。在恢复和参考段中的成熟阶段（继承）过渡的地貌占主导地位的恢复活力，而控制段中的连续占主导地位。恢复的段中的圆形度和编织指标比参考资料更多地增加了远远超过控制段。河岸植物社区，沉默的碎片中的殖民地砾石条类似于在不受管制的细分市场中发现的那些，并且与非恢复部分中的发现略有不同。在线变异性高得多，表明河岸植物社区对本地进程的依赖。虽然阳性，我们的研究结果表明，工业化社会人类受约束河流中洪泛区的高稳定性限制了纵向结构操纵的短期效力作为恢复策略。我们还表明，使用相对简单的空中光学互动和先锋栖息地的植被调查的评估可以在完成后不久的是河流修复项目的轨迹。然而，对几何轨迹和相关植物社区的长期监测将有助于确定未来额外干预的时间，以确保河岸栖息地的自然恢复力。

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