The role of coastal wetlands as natural ‘blue carbon’ sinks may be counter‐acted by emissions of methane (CH₄) and nitrous oxide (N₂O). Site‐specific fluxes of these two potent greenhouse gases from coastal wetlands show high spatial and temporal variability , making global estimates sensitive to statistical assumptions and uncertainties. Here, we review the magnitude of CH₄ and N₂O fluxes from mangroves, saltmarshes and seagrasses and identify direct and indirect drivers that can control production and consumption pathways. Significant research is required to better quantify fluxes and to understand factors causing flux variability from different transport pathways before restoration of coastal blue carbon ecosystems can be reliably used for climate mitigation.

中文翻译：

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甲烷和一氧化二氮排放使沿海蓝碳评估复杂化

甲烷（CH ₄）和一氧化二氮（N ₂ O）的排放可以抵消沿海湿地作为天然“蓝碳”汇的作用。来自沿海湿地的这两种强效温室气体的特定地点通量显示出高的时空变化性，使全球估计值对统计假设和不确定性敏感。在这里，我们回顾CH ₄和N _2的大小O来自红树林，盐沼和海草的通量，并确定可以控制生产和消费途径的直接和间接驱动因素。需要进行大量研究，才能更好地量化通量，并了解导致沿海蓝碳生态系统恢复可靠地用于缓解气候变化之前，来自不同运输途径的通量变化的因素。