Dense vegetation hinders sediment transport toward saltmarsh interiors

IF 5.1 2区 地球科学 Q1 LIMNOLOGY
Olivier Gourgue, Jean-Philippe Belliard, Yiyang Xu, Maarten G. Kleinhans, Sergio Fagherazzi, Stijn Temmerman
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Abstract

To save saltmarshes and their valuable ecosystem services from sea level rise, it is crucial to understand their natural ability to gain elevation by sediment accretion. In that context, a widely accepted paradigm is that dense vegetation favors sediment accretion and hence saltmarsh resilience to sea level rise. Here, however, we reveal how dense vegetation can inhibit sediment accretion on saltmarsh platforms. Using a process-based modeling approach to simulate biogeomorphic development of typical saltmarsh landscapes, we identify two key mechanisms by which vegetation hinders sediment transport from tidal channels toward saltmarsh interiors. First, vegetation concentrates tidal flow and sediment transport inside channels, reducing sediment supply to platforms. Second, vegetation enhances sediment deposition near channels, limiting sediment availability for platform interiors. Our findings suggest that the resilience of saltmarshes to sea level rise may be more limited than previously thought.

Abstract Image

茂密的植被阻碍了沉积物向盐沼内部的迁移
要使盐沼及其宝贵的生态系统服务免受海平面上升的影响,关键是要了解它们通过沉积物淤积获得海拔升高的自然能力。在这种情况下,一种被广泛接受的模式是,茂密的植被有利于沉积物的增加,从而使盐沼对海平面上升具有抗御能力。然而,我们在这里揭示了茂密植被如何抑制盐沼平台的沉积物吸积。利用基于过程的建模方法模拟典型盐沼地貌的生物地貌发展,我们发现了植被阻碍沉积物从潮汐通道向盐沼内部输送的两个关键机制。首先,植被将潮汐流和沉积物运输集中在水道内,减少了对平台的沉积物供应。其次,植被加强了渠道附近的沉积物沉积,限制了平台内部的沉积物供应。我们的研究结果表明,盐沼对海平面上升的恢复能力可能比以前想象的更加有限。
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来源期刊
CiteScore
10.00
自引率
3.80%
发文量
63
审稿时长
25 weeks
期刊介绍: Limnology and Oceanography Letters (LO-Letters) serves as a platform for communicating the latest innovative and trend-setting research in the aquatic sciences. Manuscripts submitted to LO-Letters are expected to present high-impact, cutting-edge results, discoveries, or conceptual developments across all areas of limnology and oceanography, including their integration. Selection criteria for manuscripts include their broad relevance to the field, strong empirical and conceptual foundations, succinct and elegant conclusions, and potential to advance knowledge in aquatic sciences.
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