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首页> 外文期刊>Marine ecology progress series >Effect of aquacultured oyster biodeposition on sediment N_2 production in Chesapeake Bay
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Effect of aquacultured oyster biodeposition on sediment N_2 production in Chesapeake Bay

机译：水产养殖牡蛎沉积对切萨皮克湾沉积物N_2产生的影响

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Suspension feeding bivalves have the potential to mitigate estuarine and coastal marine eutrophication by permanently removing nitrogen (N) from the system. We conducted an integrated field and laboratory examination of the effect of eastern oyster biodeposition on sediment denitrification (DNF) and anammox (AMX) rates to quantify the N removal potential of oyster aquaculture using 2 commercial-scale sites in Chesapeake Bay, USA. Sediment N_2 production rates were measured using 2 techniques, ~(15)N isotope tracer (n = 51) and N_2:Ar (n = 30). Oyster biodeposit N-load rates explained 21 % of variation in sediment N_2 production (DNF and AMX). Oyster sediment N_2 production rates ranged from 0.00 to 1.56 mmol N m~(-2) d~(-1) and were almost always lower than reference sediments. From laboratory-based biodeposit addition and field-based forced biodeposit accumulation experiments, we found -2.50 mmol N m~(-2) d~(-1) to be the maximum sediment N_2 production capacity of these sediments, regardless of increasing organic N or labile organic carbon delivery rates. We found no evidence to support the contention that biodeposition associated with oyster aquaculture significantly impacts annual N removal via sediment N_2 production, i.e. stimulation or inhibition, above reference rates, but there was evidence that sediment NH_4~+ efflux rates were increased. We estimate the N removal rate via sediment N_2 production at similar oyster cultivation sites (1750 m2) with 5 × 10~5 oysters ranges from 0.49 to 12.60 kg N yr~(-1), compared to 2.27 to 16.72 kg N yr~(-1) at reference sites. Thus, aquacultured oyster biodeposition did not have a ubiquitously enhancing effect on N removal rates via N_2 production and is therefore unlikely to be effective as a policy initiative for eutrophication mitigation.
机译：悬浮饲料的双壳类动物有可能通过从系统中永久去除氮（N）来减轻河口和沿海海洋富营养化。我们对东部牡蛎生物沉积对沉积物反硝化（DNF）和厌氧厌氧菌（AMX）速率的影响进行了综合的田间和实验室检查，以利用美国切萨皮克湾的2个商业规模站点来量化牡蛎养殖的氮去除潜力。使用〜（15）N同位素示踪剂（n = 51）和N_2：Ar（n = 30）这两种技术测量了沉积物N_2的产生速率。牡蛎的生物沉积氮负荷率解释了沉积物N_2产量（DNF和AMX）变化的21％。牡蛎沉积物N_2的产生速率为0.00〜1.56 mmol N m〜（-2）d〜（-1），几乎总是低于参考沉积物。通过基于实验室的生物沉积物添加和基于田间的强制性生物沉积物积累实验，我们发现-2.50 mmol N m〜（-2）d〜（-1）是这些沉积物的最大沉积物N_2生产能力，而与有机氮的增加无关或不稳定的有机碳输送速度。我们发现没有证据支持与牡蛎养殖相关的生物沉积显着影响高于基准速率的沉积物N_2的产生（即刺激或抑制）对年度氮去除的影响，但有证据表明沉积物NH_4〜+外排率增加了。我们估计在5×10〜5牡蛎的相似牡蛎养殖场（1750 m2）上通过沉积物N_2产生的氮去除率在0.49至12.60 kg N yr〜（-1）之间，而在2.27至16.72 kg N yr〜（ -1）在参考地点。因此，水产养殖牡蛎的生物沉积没有通过增加N_2的产生而对N去除率的增强作用，因此不可能有效地作为减轻富营养化的政策措施。

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