Structural complexity influences the ecosystem engineering effects of in-stream large wood,Earth Surface Processes and Landforms

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Structural complexity influences the ecosystem engineering effects of in-stream large wood
Earth Surface Processes and Landforms ( IF 2.8 ) Pub Date : 2021-05-04 , DOI: 10.1002/esp.5145
Matthew J. Cashman _{1,

2,

3,

4} , Gemma L. Harvey ₁ , Geraldene Wharton ₁

Affiliation

Large wood (LW) is an ecosystem engineer and keystone structure in river ecosystems, influencing a range of hydromorphological and ecological processes and contributing to habitat heterogeneity and ecosystem condition. LW is increasingly being used in catchment restoration, but restored LW jams have been observed to differ in physical structure to naturally occurring jams, with potential implications for restoration outcomes. This article examines the structural complexity and ecosystem engineering effects of LW jams at four sites with varying management intensity incorporating natural and restored wood. Our results reveal: (i) structural complexity and volume of jams was highest in the site with natural jams and low intensity riparian management, and lowest in the suburban site with simple restored jams; and (ii) that structural complexity influences the ecosystem engineering role of LW, with more complex jams generating the greatest effects on flow hydraulics (flow concentration, into bed flows) and sediment characteristics (D₅₀, organic content, fine sediment retention) and the simplest flow deflector-style restored jams having the least pronounced effects. We present a conceptual model describing a continuum of increasing jam structural complexity and associated hydromorphological effects that can be used as a basis for positioning and evaluating other sites along the management intensity spectrum to help inform restoration design and best practice.

中文翻译：

结构复杂性影响河道大木生态工程效应

大木 (LW) 是河流生态系统中的生态系统工程师和关键结构，影响一系列水文形态和生态过程，并有助于栖息地异质性和生态系统条件。LW 越来越多地用于流域恢复，但已观察到恢复的 LW 堵塞在物理结构上与自然发生的堵塞不同，对恢复结果具有潜在影响。本文研究了四个地点的 LW 堵塞的结构复杂性和生态系统工程影响，这些地点具有不同的管理强度，包括天然和恢复木材。我们的研究结果表明：（i）结构复杂性和堵塞量在自然堵塞和低强度河岸管理的场地中最高，在郊区场地中最低，只有简单的恢复堵塞；D ₅₀，有机物含量，细泥沙滞留）和最简单的导流器式修复堵塞，效果最不明显。我们提出了一个概念模型，描述了不断增加的堵塞结构复杂性和相关的水文形态效应，可用作定位和评估管理强度范围内的其他站点的基础，以帮助为恢复设计和最佳实践提供信息。

更新日期：2021-05-04

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