Sediment resuspension may play a major role in sediment-water exchange of nutrients, matter and energy in coastal areas where waves and currents dominate sediment transport. Biogeochemical sediment properties regulate sediment erodibility, but there is only limited knowledge of how temporal variability in environmental variables is reflected in the resuspension potential, especially for subtidal habitats. Further, the significance of resuspension on nutrient fluxes in coastal environments has remained unclear as contradicting results have been reported. Here we quantified the temporal variation in resuspension potential metrics (erosion threshold (τ_c; N m⁻²) and erosion constant (m_e; g N⁻¹ s⁻¹)) and associated nutrient fluxes from three sites in the Hanko archipelago (Finland) using a core-based erosion device (EROMES). The sites were sampled bi-monthly from April to December. We also quantified the temporal variation in biogeochemical sediment properties at each site. The τ_c exhibited the clearest temporal pattern in muddy sediment, where the coefficient of variation (= 67) was two to three times higher than the mixed (= 29) and sandy (= 16) sediments. Dry bulk density was the best predictor for sediment erodibility at all sites explaining 26–46% of the temporal variation in τ_c despite its limited variability at sandier sites. In addition, temporal variations in the macrofaunal community were important predictors of muddy sediment erodibility and therefore community dynamics need to be considered in sediment transport studies. All sites were potential nutrient sources, yet the overall role of sediment resuspension on nutrient release from the sediments was small.

中文翻译：

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浅海沿海环境中悬浮势及相关营养动态的时空变化

在沿海地区，波浪和水流主导着沉积物的运输，沉积物的重新悬浮可能在沉积物与水之间的养分，物质和能量交换中起主要作用。生物地球化学沉积物的性质调节着沉积物的可蚀性，但是关于重悬潜能如何反映环境变量的时间变化的知识只有很少的了解，特别是对于潮下生境。此外，由于据报矛盾的结果，在沿海环境中重新悬浮对养分通量的重要性仍不清楚。在这里，我们在定量悬浮电位的度量（在时间上变化侵蚀阈值（τ _ç ; N米^-2）和侵蚀常数（米_é ;克N- ^-1 小号^-1））以及使用基于核心的侵蚀装置（EROMES）从汉科群岛（芬兰）三个地点的相关养分通量。这些站点从4月到12月每两个月采样一次。我们还量化了每个站点的生物地球化学沉积物特性的时间变化。的τ _Ç表现出在泥泞的沉积物清亮的时间模式，其中变异的（= 67）的系数比混合（= 29）和沙（= 16）的沉积物高出两到三倍。干堆积密度为在所有站点说明在时间上变化的26-46％沉积物可蚀性的最佳预测τ _Ç尽管沙地处的变异性有限。此外，大型动物群落的时间变化是泥沙沉积物易蚀性的重要预测指标，因此在沉积物迁移研究中需要考虑群落动态。所有地点都是潜在的养分来源，但沉积物再悬浮对沉积物养分释放的总体作用很小。