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首页> 外文期刊>Estuarine Coastal and Shelf Science >Ecosystem engineering by annual intertidal seagrass beds: Sediment accretion and modification
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Ecosystem engineering by annual intertidal seagrass beds: Sediment accretion and modification

机译：每年潮间带海草床的生态系统工程：沉积物的增加和改变

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摘要

Seagrasses are generally known as ecosystem engineers, as they reduce flow velocities in their canopies. In perennial subtidal meadows, this usually leads to increased net sedimentation rates and reduction of the grain size. The present study aims to describe the contribution of annual seagrass populations to these processes and elucidate the temporal dynamics. Sediment accretion and grain size modification were experimentally tested by transplanting seedlings of an annual intertidal eelgrass population to an unvegetated tidal flat. Within the planting units (79 shoots m~(-2)) 4.7 mm of sediment accreted, whereas in the most dense parts of these units (199 shoots m~(-2)) accretion amounted to 7.1 mm. The silt fraction ( < 63 μm) increased and the sand fraction (63—500 μm) decreased in the eelgrass beds, which provides evidence that higher silt content in seagrass beds is the result and not the cause of seagrass presence. Annual intertidal eelgrass beds significantly contribute to the immobilisation of sediment during the growing season with its magnitude depending on canopy density. During winter, the accumulated sediments were released again and could even induce additional erosion. Possible consequences of these sediment dynamics for the larger scale functioning of estuarine ecosystems are discussed.
机译：海草通常被称为生态系统工程师，因为它们会降低其冠层的流速。在多年生的潮间带草甸中，这通常导致增加的净沉降速率和减小颗粒尺寸。本研究旨在描述一年生海草种群对这些过程的贡献并阐明时间动态。通过将一年生潮间鳗草种群的幼苗移植到无植被的滩涂上，对沉积物的积聚和粒度变化进行了实验测试。在种植单元内（79个芽m〜（-2）），积聚了4.7 mm的沉积物，而在这些单元中最密集的部分（199个芽m〜（-2）），积聚了7.1 mm。鳗草床中的泥沙含量（<63μm）增加，而沙子含量（63-500μm）减少，这提供了证据，表明海草床中较高的泥沙含量是海藻存在的结果，而不是原因。一年生的潮间带鳗草床在生长季节中对固定化沉积物的贡献很大，其大小取决于树冠密度。在冬季，积聚的沉积物再次被释放，甚至可能引起额外的侵蚀。讨论了这些沉积物动力学对河口生态系统更大规模运行的可能后果。

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