Reviews and Syntheses: Spatial and temporal patterns in metabolic fluxes inform potential for seagrass to locally mitigate ocean acidification
Reviews and Syntheses: Spatial and temporal patterns in metabolic fluxes inform potential for seagrass to locally mitigate ocean acidification
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评论与综合：代谢通量的空间和时间模式揭示了海草局部缓解海洋酸化的潜力
DOI：
10.5194/bg-2021-137
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发表时间：
2021
期刊：
影响因子：
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通讯作者：
B. Gaylord
中科院分区：
文献类型：
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作者：
K. Kroeker;Tye L. Kindinger;H. Hirsh;M. Ward;T. Hill;Brittany M. Jellison;D. Koweek;Sarah Lummis;E. Rivest;G. Waldbusser;B. Gaylord
抽象的。随着全球变化的继续发展，人们越来越有兴趣评估任何可用于管理二氧化碳浓度上升的社会和生态影响的地方杠杆。虽然栖息地保护和恢复在全球范围内的碳储存和固存中的作用已得到广泛认可，但管理人员在面临海洋酸化（OA）加速威胁的海洋生态系统中使用植被栖息地以减轻局部尺度CO2浓度的潜力最近才引起关注。早期的研究表明，沉水植物，如海草床，可以通过光合作用局部吸收CO2，提高海水pH值，但局部OA缓解的经验研究仍然非常有限。在这里，我们利用大量的文献海草群落代谢，通过海草保护或恢复强调当地OA管理的关键因素。特别是，我们综合了62项研究的结果，报告海草总初级生产力，呼吸和/或净群落生产力的原位速率，以突出碳通量的时空变异。我们说明，白天净社区生产是积极的整体，并在不同季节和地理相似。全天净群落生产率，这说明了潜在的累积效应海草床的海水地球化学综合在白天和黑夜，也是积极的整体，但在热带和温带生态系统的夏季较高。虽然我们的分析表明，海草草甸一般是自养的，模拟海水pH值的影响相对较小的幅度。此外，我们说明，全天净群落生产最高的时期可能与夜间pH值较低和海水pCO 2/pH值的昼夜变化增加有关。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实用性提供信息。
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.