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首页> 外文期刊>Estuarine Coastal and Shelf Science >Seasonal changes in sediment erodibility associated with biostabilization in a subarctic intertidal environment, St. Lawrence Estuary, Canada
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Seasonal changes in sediment erodibility associated with biostabilization in a subarctic intertidal environment, St. Lawrence Estuary, Canada

机译：加拿大圣劳伦斯河口环境中与生物化相关的沉积物蚀刻沉积物的季节变化

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The sediment dynamics and the long-term evolution of intertidal environments depend on the erosion threshold, which is often increased by microbial biofilms. Intertidal biostabilization has been well studied in temperate and subtropical environments, but little is known for subarctic conditions with strong seasonal changes in vegetation cover and sea ice presence in winter because of the difficulty in studying the sediments under ice cover. The present project investigated the role of biofilms and their seasonal as well as spatial variations for sediment biostabilization in a subarctic intertidal area near Rimouski (Quebec, Canada). Grain size distribution reflected a seaward increasing trend in sand content and mean grain size. The poor sorting of sediments results from the contribution of sediment transport by ice rafting in addition to the hydrodynamic transport processes in this subarctic intertidal area. A Cohesive Strength Meter (CSM) was used to measure the erosion threshold (tau(crit)) across the entire intertidal area. Chlorophyll a (Chl a) and extra polymeric substances (EPS) were measured in the top 3 mm. The high marsh had a far higher tau(crit) than the low marsh, but there was much less variation between low marsh, mudflat and sandflat. tau(crit )was significantly correlated with Chl a, elevation, and organic matter content. EPS was not a good indicator for tau(crit), except for the low marsh/high marsh difference. The results showed a seasonal cycle in intertidal bed emdibility. Lower intertidal areas had highest tau(crit) in autumn during the storm season, followed by lowest tau(crit) in winter under sea-ice cover, and no major difference between summer and spring. This study highlights the characteristics of cold climate intertidal areas, where low temperatures in autumn and land-fast ice cover during winter severely affect biofilms and intertidal vegetation, and ultimately their capacity to shield sediments from erosion.
机译：沉积物动力学和透模环境的长期演变取决于侵蚀阈值，这通常由微生物生物膜增加。在温带和亚热带环境中进行了很好地研究了跨透视生物化，但由于难以研究冰盖下的沉积物，亚脐带状况较小，省曲的季节性变化较小，因此省植被覆盖和海洋冰块存在很小。目前的项目调查了生物膜和季节性的作用以及在Rimouski附近的象神潮间区（加拿大魁北克省）的居际潮间区的空间变化。粒度分布反映了沙含量和平均晶粒尺寸的海洋增加趋势。除了该亚宫间潮间面积的流体动力学输送过程之外，沉积物的差异差异是由冰漂流的贡献。在整个潮间区域上使用粘性强度计（CSM）测量侵蚀阈值（TAU（CRIT））。在前3mm中测量叶绿素A（CHL A）和额外的聚合物物质（EPS）。高沼泽具有比低沼泽更高的Tau（CRIT），但低沼泽，泥浆和夹层之间的变化越来越少。 TAU（CRIT）与CHL A，升高和有机物质含量显着相关。除了低沼泽/高沼泽差异外，EPS不是Tau（Crit）的良好指标。结果表明透床可用性季节性循环。在风暴季节期间，秋季的秋季较低的地区有最高的Tau（暴击），其次是海冰覆盖下的冬季最低的Tau（Crit），夏季和春季没有主要区别。本研究突出了寒冷的气候潮间区域的特点，冬季秋季和陆地快速冰盖的低温严重影响生物膜和透界植被，最终避免侵蚀沉积物的能力。

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