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Mitigation of Eutrophication and Hypoxia through Oyster Aquaculture: An Ecosystem Model Evaluation off the Pearl River Estuary
Environmental Science & Technology ( IF 10.8 ) Pub Date : 2021-03-24 , DOI: 10.1021/acs.est.0c06616 Liuqian Yu 1 , Jianping Gan 1
Environmental Science & Technology ( IF 10.8 ) Pub Date : 2021-03-24 , DOI: 10.1021/acs.est.0c06616 Liuqian Yu 1 , Jianping Gan 1
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Shellfish aquaculture has been proposed to abate eutrophication because it can remove nutrients via shellfish filter-feeding. Using a three-dimensional physical-biogeochemical model, we investigate how effective oyster aquaculture can alleviate eutrophication-driven hypoxia off the Pearl River Estuary. Results show that oysters reduce sediment oxygen consumption and thus hypoxia, by reducing both particulate organic matter directly and regenerated nutrients that support new production of organic matter. The hypoxia reduction is largest when oysters are farmed within the upper water of the low-oxygen zone, and the reduction increases with increasing oyster density although oyster growth becomes slower due to food limitation. When oysters are farmed upstream of the hypoxic zone, the farming-induced hypoxia reduction is small and it declines with increasing oyster density because the nutrients released from the farm can increase downstream organic matter production. An oyster farming area of 10 to 200 km2 yields a hypoxic volume reduction of 10% to 78%, equaling the impact of reducing 10% to 60% of river nutrient input. Our results demonstrate that oyster aquaculture can mitigate eutrophication and hypoxia, but its effectiveness depends on the farming location, areal size, and oyster density, and optimal designs must take into account the circulation and biogeochemical characteristics of the specific ecosystem.
中文翻译：
通过牡蛎养殖减轻富营养化和低氧：珠江口附近的生态系统模型评估
已经提出贝类水产养殖可以减轻富营养化，因为它可以通过贝类滤食喂养去除营养。使用三维物理生物地球化学模型，我们研究了牡蛎养殖如何有效缓解珠江口附近富营养化引起的缺氧。结果表明，牡蛎通过直接减少颗粒状有机物和支持有机物新生产的再生养分，减少了沉积物的氧气消耗，从而减少了缺氧。当牡蛎养殖在低氧区域的上层水域时，缺氧减少最大，尽管牡蛎的生长由于食物的限制而变慢，但减少程度随牡蛎密度的增加而增加。当牡蛎养殖在缺氧区上游时，养殖引起的缺氧减少很小，并且随着牡蛎密度的增加而减少，因为从农场释放的养分可以增加下游有机物的产量。10至200公里的牡蛎养殖区2使缺氧量减少10％至78％，等于减少10％至60％的河流养分输入的影响。我们的结果表明，牡蛎养殖可以减轻富营养化和缺氧，但是其有效性取决于养殖地点，面积和牡蛎密度，最佳设计必须考虑特定生态系统的循环和生物地球化学特征。
更新日期：2021-04-20
中文翻译：
通过牡蛎养殖减轻富营养化和低氧：珠江口附近的生态系统模型评估
已经提出贝类水产养殖可以减轻富营养化，因为它可以通过贝类滤食喂养去除营养。使用三维物理生物地球化学模型，我们研究了牡蛎养殖如何有效缓解珠江口附近富营养化引起的缺氧。结果表明，牡蛎通过直接减少颗粒状有机物和支持有机物新生产的再生养分，减少了沉积物的氧气消耗，从而减少了缺氧。当牡蛎养殖在低氧区域的上层水域时，缺氧减少最大，尽管牡蛎的生长由于食物的限制而变慢，但减少程度随牡蛎密度的增加而增加。当牡蛎养殖在缺氧区上游时，养殖引起的缺氧减少很小，并且随着牡蛎密度的增加而减少，因为从农场释放的养分可以增加下游有机物的产量。10至200公里的牡蛎养殖区2使缺氧量减少10％至78％，等于减少10％至60％的河流养分输入的影响。我们的结果表明，牡蛎养殖可以减轻富营养化和缺氧，但是其有效性取决于养殖地点，面积和牡蛎密度，最佳设计必须考虑特定生态系统的循环和生物地球化学特征。
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