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首页> 外文期刊>Estuarine Coastal and Shelf Science >Application of an ecosystem model for the environmental assessment of the reclamation and mitigation plans for seagrass beds in Atsumi Bay
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Application of an ecosystem model for the environmental assessment of the reclamation and mitigation plans for seagrass beds in Atsumi Bay

机译：生态系统模型在厚水湾海草床开垦和减缓计划的环境评估中的应用

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摘要

An ecosystem model was used to evaluate the effects of reclaiming seagrass beds and creating artificial shallows with seagrass beds to mitigate the effects of the reclamation. The applied model can simulate the pelagic and benthic ecosystems including seagrass beds and tidal flats. The objectives of this study were (a) to investigate the likelihood of cultivating and maintaining seagrass beds in artificial shallows (Part 1), and (b) to understand the effects of the reclamation of seagrass beds and the creation of artificial shallows on the water quality in the estuary (Part 2). In Part 1, first, the nutrient turnover rates due to both biochemical and physical processes in the natural seagrass beds where reclamation is proposed were analyzed. Biological processes rather than physical processes were the most significant driving forces of nutrient cycles in seagrass beds. Second, the effects of filter feeding benthic fauna (suspension feeders) in the seagrass beds were analyzed. The scenario with suspension feeders resulted in higher transparency of the water column (8.7% decrease in the light attenuation coefficient) and an increase in nutrient supply (24.9% increase in NH4-N in the water column) contributing to the high specific growth rate of seagrass. Third, the specific growth rate of seagrass on the proposed artificial shallows was measured. The value on the artificial shallows set at a depth of datum line minus 0.8 m (D.L. - 0.8 m) was approximately the same as that of the natural seagrass beds. In Part 2, first, water quality in the estuary was compared among the scenarios with/without natural seagrass beds and artificial shallows. Then, the defined values of the water purification capability of (a) artificial shallows with/without seagrass beds, and (b) natural seagrass beds per unit area were evaluated. The reclamation of the natural seagrass beds resulted in a decrease of the removal of phytoplankton and detritus from the pelagic system (i.e. resulted in a loss in the purification rate). In contrast, the creation of artificial shallows resulted in an increase of the removal of phytoplankton and detritus from the pelagic system (i.e. resulted in a gain in the purification rate). Based on an annual average, approximately twice as much phytoplankton was removed from the artificial shallows at the depth D.L. - 0.8 m, than at the depth, D.L. - 1.5 m, and the artificial shallows with seagrass beds removed pelagic DIN and DIP at a rate 120% higher than that without seagrass beds.
机译：生态系统模型用于评估回收海草床并创建具有海草床的人工浅层以减轻开垦影响的效果。应用的模型可以模拟包括海草床和滩涂的中上层和底栖生态系统。这项研究的目的是（a）研究在人工浅滩中培养和维护海草床的可能性（第1部分），以及（b）了解开垦海草床和创建人工浅滩对水的影响河口的水质（第2部分）。在第1部分中，首先分析了提议进行填海的天然海草床中由于生化和物理过程引起的养分周转率。生物过程而非物理过程是海草床中养分循环的最重要驱动力。其次，分析了过滤器喂食海草床底栖动物（悬浮喂食器）的效果。使用悬浮喂料器的情况导致水柱更高的透明度（光衰减系数降低8.7％）和养分供应量增加（水柱中NH4-N增长24.9％），从而导致了高比生长率。海草。第三，测量了拟建的人工浅滩上海草的比增长率。设置在基准线深度减去0.8 m（D.L.-0.8 m）的人造浅滩上的值与天然海草床的值大致相同。在第2部分中，首先，比较了有/没有天然海草床和人工浅滩的情况下河口的水质。然后，评估了（a）有/没有海草床的人造浅滩和（b）单位面积的天然海草床的净水能力的定义值。天然海草床的开垦导致浮游系统和碎屑从中上层系统中的去除减少（即导致净化率降低）。相反，人工浅滩的产生导致浮游植物和碎屑从中上层系统中的去除增加（即，导致净化率提高）。根据每年的平均值，在深度D.L处，从人工浅滩去除的浮游植物大约是两倍。 -0.8 m，比深度D.L. -1.5 m，带有海草床的人工浅滩去除了远洋DIN和DIP，比没有海草床的高出120％。

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