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首页> 外文期刊>Earth Surface Processes and Landforms: The journal of the British Geomorphological Research Group >On the feedback between water turbidity and microphytobenthos growth in shallow tidal environments
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On the feedback between water turbidity and microphytobenthos growth in shallow tidal environments

机译：浅潮汐环境中水浊度与微蛋白生长的反馈

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摘要

Shallow tidal environments (e.g.bays, estuaries, lagoons) represent one of the most productive ecosystems in the world, and they are threatened by current climate change and increasing human pressure. Monitoring the bio-morphodynamic evolution of these environments is therefore a crucial task that requires a detailed and holistic scrutiny. The present study aims to investigate the temperature of the water-sediment continuum, its effect on the related microphytobenthos (MPB) growth and the related bio-stabilization of the bed sediment surface under different water depth and water turbidity conditions. We investigated the vertical energy transfer and the temperature dynamics by applying a 1-D model to a shallow coastal lagoon. Our results show that the water temperature does not substantially change under different turbidity conditions, whereas the sediment temperature exhibits important changes. Two major factors driving the MPB photosynthetic growth are the sediment surface temperature and the light availability at the sediment bed, which can both be computed using the vertical energy transfer model. We observed that, in general, clear water conditions better promote MPB growth over the entire year. The limiting factor for the photosynthetic process is usually the light availability at the bottom, which increases under clear water conditions. As MPB provides a bio-stabilizing effect on the bed sediments by producing a biofilm on the sediment surface that reduces sediment resuspension, our results suggest a positive feedback between MPB growth and water column turbidity. Furthermore, MPB growth and the related sediment bio-stabilization are clearly affected by the seasonal variation of surface sediment temperature and light availability. This seasonal variation of MPB growth rate and surface sediment bio-stabilization must be considered when studying the long-term morphodynamic evolution of tidal environments. (c) 2018 John Wiley & Sons Ltd.
机译：浅潮汐环境（例如，河汇，河口，Lagoons）代表世界上最富有成效的生态系统之一，他们受到当前气候变化和增加人的压力的威胁。因此，监测这些环境的生物形态动力学演变是一个重要的任务，需要一个详细和整体审查。本研究旨在研究水泥连续体的温度，其对不同水深和水浊度条件下床沉积物表面的对相关微粒（MPB）生长和相关生物稳定的影响。通过将1-D模型应用于浅沿海泻湖，我们调查了垂直能量转移和温度动力学。我们的研究结果表明，在不同的浊度条件下，水温在不同的情况下没有变化，而沉积物温度表现出重要的变化。推动MPB光合生长的两个主要因素是沉积物表面温度和沉积物床的光可用性，可以使用垂直能量转移模型来计算。我们观察到，一般而言，清澈的水条件更好地促进全年MPB增长。光合作用过程的限制因素通常是底部的光可用性，这在清澈的水条件下增加。由于MPB通过在减少沉积物表面上产生生物膜来提供对床沉积物的生物稳定效果，这表明了MPB生长和水柱浊度之间的正反馈。此外，受到表面沉积温度和光可用性的季节变化显然影响了MPB生长和相关沉积物生物稳定。在研究潮汐环境的长期形态学演变时，必须考虑这种MPB生长速率和表面沉积物生物稳定的这种季节性变化。 （c）2018 John Wiley＆Sons Ltd.

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