Upland vegetation removal as a potential tool for facilitating landward salt marsh migration

IF 2.8 3区 环境科学与生态学 Q2 ECOLOGY
Kenneth B. Raposa, Robin L. J. Weber, Daisy Durant, Jon C. Mitchell, Scott Rasmussen, Richard A. McKinney, Cathleen Wigand
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引用次数: 0

Abstract

To increase the resilience of salt marshes subject to sea‐level rise impacts, managers can focus on interventions within current marsh footprints or in adjacent uplands to facilitate landward marsh migration. The latter approach may be more appropriate when degradation is severe and in situ intervention options are limited. Strategies for facilitating marsh migration include removing artificial barriers, soil grading to reduce steep topography, and manipulating adjacent upland vegetation that can hinder migration, but experiments testing the effectiveness of these activities are limited. We therefore conducted a field experiment to determine if physically removing three upland vegetation types (forest, shrub, and Phragmites australis) adjacent to a Rhode Island salt marsh facilitates short‐term marsh migration. Upland vegetation removal led to increased ambient light in all habitats, significantly enhanced marsh plant cover, extent, and elevation in shrub habitat, and declines in total bird abundance in forest and shrub habitats. Enhanced migration did not occur in forest or Phragmites habitats, and in shrubs, marsh plants only colonized where Baccharis halimifolia, common in upper marsh borders, had been removed. Five years after removal, all upland habitats and associated vegetation were indistinguishable from initial conditions. Our study suggests that upland plant removal might provide a limited window for facilitating salt marsh migration and that more intensive methods may be needed for sustained, longer‐term benefits. It also demonstrates that there may be ecological trade‐offs to consider when altering upland habitats to enhance landward marsh migration.
将移除高地植被作为促进盐沼向陆地迁移的潜在工具
为提高盐沼受海平面上升影响的恢复能力,管理者可重点在当前沼泽足迹内或邻近高地进行干预,以促进沼泽向陆地迁移。后一种方法可能更适合退化严重、原地干预方案有限的情况。促进沼泽迁移的策略包括清除人工障碍、平整土地以减少陡峭的地形,以及处理可能阻碍迁移的邻近高地植被,但测试这些活动有效性的实验非常有限。因此,我们进行了一项实地实验,以确定物理移除罗德岛盐沼附近的三种高地植被类型(森林、灌木和葭藻)是否会促进短期沼泽迁移。移除高地植被会增加所有栖息地的环境光照,显著提高灌木栖息地的沼泽植物覆盖率、范围和海拔,并降低森林和灌木栖息地的鸟类总丰度。在森林和葭萌生境中,鸟类迁徙并没有增加;在灌木生境中,沼泽植物只在上部沼泽边界常见的Baccharis halimifolia被移除的地方生长。移除五年后,所有高地栖息地和相关植被都与最初的情况无异。我们的研究表明,移除高地植物可能只能为盐沼迁移提供有限的便利,要想获得持续、长期的效益,可能需要采取更密集的方法。研究还表明,在改变高地生境以促进沼泽向陆地迁移时,可能需要考虑生态权衡。
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来源期刊
Restoration Ecology
Restoration Ecology 环境科学-生态学
CiteScore
6.50
自引率
15.60%
发文量
226
审稿时长
12-24 weeks
期刊介绍: Restoration Ecology fosters the exchange of ideas among the many disciplines involved with ecological restoration. Addressing global concerns and communicating them to the international research community and restoration practitioners, the journal is at the forefront of a vital new direction in science, ecology, and policy. Original papers describe experimental, observational, and theoretical studies on terrestrial, marine, and freshwater systems, and are considered without taxonomic bias. Contributions span the natural sciences, including ecological and biological aspects, as well as the restoration of soil, air and water when set in an ecological context; and the social sciences, including cultural, philosophical, political, educational, economic and historical aspects. Edited by a distinguished panel, the journal continues to be a major conduit for researchers to publish their findings in the fight to not only halt ecological damage, but also to ultimately reverse it.
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