King Abdullah University of Science and Technology (KAUST), Red Sea (RSRC) and Computational Bioscience (CBRC) Research Centers, Thuwal, 23955-6900, Saudi Arabia.
School of Life and Environmental Sciences, Centre for Integrative Ecology, Deakin University, Geelong, Victoria, 3216, Australia.
Nat Commun. 2019 Mar 7;10(1):1106. doi: 10.1038/s41467-019-08842-6.
Calcium carbonates (CaCO) often accumulate in mangrove and seagrass sediments. As CaCO production emits CO, there is concern that this may partially offset the role of Blue Carbon ecosystems as CO sinks through the burial of organic carbon (C). A global collection of data on inorganic carbon burial rates (C, 12% of CaCO mass) revealed global rates of 0.8 TgC yr and 15-62 TgC yr in mangrove and seagrass ecosystems, respectively. In seagrass, CaCO burial may correspond to an offset of 30% of the net CO sequestration. However, a mass balance assessment highlights that the C burial is mainly supported by inputs from adjacent ecosystems rather than by local calcification, and that Blue Carbon ecosystems are sites of net CaCO dissolution. Hence, CaCO burial in Blue Carbon ecosystems contribute to seabed elevation and therefore buffers sea-level rise, without undermining their role as CO sinks.
碳酸钙 (CaCO) 常在红树林和海草沉积物中积累。由于 CaCO 的生产会排放 CO，人们担心这可能会部分抵消蓝碳生态系统作为 CO 汇的作用，因为它们通过埋藏有机碳 (C) 来吸收 CO。对无机碳埋藏速率 (C，占 CaCO 质量的 12%) 的全球数据收集表明，红树林和海草生态系统的埋藏速率分别为 0.8TgC yr 和 15-62TgC yr。在海草中，CaCO 的埋藏可能相当于净 CO 封存的 30%的抵消。然而，质量平衡评估强调，C 的埋藏主要是由相邻生态系统的输入支持的，而不是由当地的钙化作用支持的，并且蓝碳生态系统是净 CaCO 溶解的地点。因此，蓝碳生态系统中 CaCO 的埋藏有助于海底抬升，从而缓冲海平面上升，而不会削弱它们作为 CO 汇的作用。
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