Australia’s tidal marshes have suffered significant losses but their recently recognised importance in CO2 sequestration is creating opportunities for their protection and restoration. We compiled all available data on soil organic carbon (OC) storage in Australia’s tidal marshes (323 cores). OC stocks in the surface 1 m averaged 165.41 (SE 6.96) Mg OC ha−1 (range 14–963 Mg OC ha−1). The mean OC accumulation rate was 0.55 ± 0.02 Mg OC ha−1 yr−1. Geomorphology was the most important predictor of OC stocks, with fluvial sites having twice the stock of OC as seaward sites. Australia’s 1.4 million hectares of tidal marshes contain an estimated 212 million tonnes of OC in the surface 1 m, with a potential CO2-equivalent value of $USD7.19 billion. Annual sequestration is 0.75 Tg OC yr−1, with a CO2-equivalent value of $USD28.02 million per annum. This study provides the most comprehensive estimates of tidal marsh blue carbon in Australia, and illustrates their importance in climate change mitigation and adaptation, acting as CO2 sinks and buffering the impacts of rising sea level. We outline potential further development of carbon offset schemes to restore the sequestration capacity and other ecosystem services provided by Australia tidal marshes.
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机译:澳大利亚的潮汐湿地遭受了重大损失,但它们最近在二氧化碳封存中的重要性正在为其保护和恢复创造机会。我们汇总了澳大利亚潮汐湿地(323个核心)中土壤有机碳(OC)储存的所有可用数据。 1 m表层的OC储量平均为165.41(SE 6.96)Mg OC ha -1 sup>(范围14-963 Mg OC ha -1 sup>)。平均OC累积率为0.55±±0.02 Mg OC ha -1 sup> yr -1 sup>。地貌是OC储量最重要的预测指标,河流点的海洋储量是沿海储量的两倍。澳大利亚的140万公顷潮汐湿地在1 m地表估计含有2.12亿吨OC,潜在的二氧化碳当量值为71.9亿美元。每年的封存量为0.75 Tg OC yr −1 sup>,每年的CO2当量价值为2,802万美元。这项研究提供了澳大利亚潮汐沼泽蓝碳的最全面的估计,并说明了它们在缓解和适应气候变化中的重要性,它是二氧化碳的汇入和缓冲海平面上升的影响。我们概述了碳补偿计划的潜在进一步发展,以恢复澳大利亚潮汐沼泽提供的固存能力和其他生态系统服务。
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