Abstract. As global change continues to progress, there is a growing interest in assessing any local levers that could be used to manage the social and ecological impacts of rising CO₂ concentrations. While habitat conservation and restoration have been widely recognized for their role in carbon storage and sequestration at a global scale, the potential for managers to use vegetated habitats to mitigate CO₂ concentrations at local scales in marine ecosystems facing the accelerating threat of ocean acidification (OA) has only recently garnered attention. Early studies have shown that submerged aquatic vegetation, such as seagrass beds, can locally draw down CO₂ and raise seawater pH in the water column through photosynthesis, but empirical studies of local OA mitigation are still quite limited. Here, we leverage the extensive body of literature on seagrass community metabolism to highlight key considerations for local OA management through seagrass conservation or restoration. In particular, we synthesize the results from 62 studies reporting in situ rates of seagrass gross primary productivity, respiration, and/or net community productivity to highlight spatial and temporal variability in carbon fluxes. We illustrate that daytime net community production is positive overall, and similar across seasons and geographies. Full-day net community production rates, which illustrate the potential cumulative effect of seagrass beds on seawater biogeochemistry integrated over day and night, were also positive overall, but were higher in summer months in both tropical and temperate ecosystems. Although our analyses suggest seagrass meadows are generally autotrophic, the modeled effects on seawater pH are relatively small in magnitude. In addition, we illustrate that periods when full-day net community production is highest could be associated with lower nighttime pH and increased diurnal variability in seawater pCO₂/pH. Finally, we highlight important areas for future research to inform the next steps for assessing the utility of this approach for management.

中文翻译：

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综述与综合：代谢通量的时空格局为海草局部缓解海洋酸化提供了潜力

摘要。随着全球变化的不断发展，人们越来越有兴趣评估可用于管理 CO ₂浓度上升所带来的社会和生态影响的任何本地杠杆。虽然栖息地保护和恢复因其在全球范围内的碳储存和封存中的作用而得到广泛认可，但在面临海洋酸化 (OA) 加速威胁的海洋生态系统中，管理者利用植被栖息地来减轻局部范围内的CO ₂浓度的潜力) 最近才引起关注。早期研究表明，海草床等淹没水生植被可以局部吸收 CO ₂并通过光合作用提高水体中海水的 pH 值，但对局部 OA 缓解的实证研究仍然非常有限。在这里，我们利用有关海草群落新陈代谢的大量文献来强调通过海草保护或恢复进行本地OA管理的关键考虑因素。特别是，我们综合了 62 项原位报告研究的结果海草总初级生产力、呼吸作用和/或净群落生产力的比率，以突出碳通量的时空变异性。我们说明白天的网络社区生产总体上是积极的，并且跨季节和地理区域相似。全天净群落生产率表明海草床对白天和夜间综合的海水生物地球化学的潜在累积影响，总体上也是积极的，但在热带和温带生态系统的夏季月份更高。尽管我们的分析表明海草草甸通常是自养的，但对海水pH值的模拟影响相对较小。此外，p CO ₂ /pH。最后，我们强调了未来研究的重要领域，为评估这种管理方法的效用的后续步骤提供信息。