Table_1_Brazilian Mangroves: Blue Carbon Hotspots of National and Global Relevance to Natural Climate Solutions.pdf

Mangroves are known for large carbon stocks and high sequestration rates in biomass and soils, making these intertidal wetlands a cost-effective strategy for some nations to compensate for a portion of their carbon dioxide (CO2) emissions. However, few countries have the national-level inventories required to support the inclusion of mangroves into national carbon credit markets. This is the case for Brazil, home of the second largest mangrove area in the world but lacking an integrated mangrove carbon inventory that captures the diversity of coastline types and climatic zones in which mangroves are present. Here we reviewed published datasets to derive the first integrated assessment of carbon stocks, carbon sequestration rates and potential CO2eq emissions across Brazilian mangroves. We found that Brazilian mangroves hold 8.5% of the global mangrove carbon stocks (biomass and soils combined). When compared to other Brazilian vegetated biomes, mangroves store up to 4.3 times more carbon in the top meter of soil and are second in biomass carbon stocks only to the Amazon forest. Moreover, organic carbon sequestration rates in Brazilian mangroves soils are 15–30% higher than recent global estimates; and integrated over the country’s area, they account for 13.5% of the carbon buried in world’s mangroves annually. Carbon sequestration in Brazilian mangroves woody biomass is 10% of carbon accumulation in mangrove woody biomass globally. Our study identifies Brazilian mangroves as a major global blue carbon hotspot and suggest that their loss could potentially release substantial amounts of CO2. This research provides a robust baseline for the consideration of mangroves into strategies to meet Brazil’s intended Nationally Determined Contributions.

红树林以其在生物量和土壤中的大量碳储量及高碳汇率而著称，这些潮间带湿地对于某些国家而言，是补偿其二氧化碳（CO2）排放的有效策略。然而，仅有少数国家具备国家层面的库存，以支持将红树林纳入国家碳信用市场。巴西便是其中一例，它是世界上第二大红树林区域的所在地，却缺乏一个能够捕捉到红树林所分布的各类海岸类型和气候区的综合红树林碳库存。在本研究中，我们回顾了已发表的数据库，以推导出巴西红树林碳储量、碳汇速率和潜在CO2eq排放的综合评估。我们发现，巴西红树林占据了全球红树林碳储量（包括生物量和土壤）的8.5%。与其他巴西植被生物群落相比，红树林在表层一米的土壤中储存的碳量高达其他植被生物群落的4.3倍，且在生物量碳储量方面仅次于亚马逊森林。此外，巴西红树林土壤中的有机碳汇速率比最新的全球估计值高出15%-30%；在整个国家范围内综合计算，它们每年所储存的碳量占全球红树林碳量的13.5%。巴西红树林木质生物质中的碳汇量占全球红树林木质生物质碳积累的10%。本研究将巴西红树林识别为全球主要的“蓝色碳”热点之一，并指出其损失可能释放出大量的CO2。本研究为将红树林纳入巴西实现其国家自主贡献目标策略提供了坚实的基准。