Laboratorio de Ecología, Instituto de Investigaciones Marinas y Costeras (IIMyC, UNMdP-CONICET), Juan B Justo 2550, Mar del Plata, (7600), Argentina.
Northern Gulf Institute, Mississippi State University, NOAA NCEI, 1021 Balch Blvd, Stennis Space Center, MS, 39529, USA.
Nat Commun. 2023 Dec 22;14(1):8500. doi: 10.1038/s41467-023-44196-w.
Coastal vegetated ecosystems are acknowledged for their capacity to sequester organic carbon (OC), known as blue C. Yet, blue C global accounting is incomplete, with major gaps in southern hemisphere data. It also shows a large variability suggesting that the interaction between environmental and biological drivers is important at the local scale. In southwest Atlantic salt marshes, to account for the space occupied by crab burrows, it is key to avoid overestimates. Here we found that southern southwest Atlantic salt marshes store on average 42.43 (SE = 27.56) Mg OC·ha (40.74 (SE = 2.7) in belowground) and bury in average 47.62 g OC·m·yr (ranging from 7.38 to 204.21). Accretion rates, granulometry, plant species and burrowing crabs were identified as the main factors in determining belowground OC stocks. These data lead to an updated global estimation for stocks in salt marshes of 185.89 Mg OC·ha (n = 743; SE = 4.92) and a C burial rate of 199.61 g OC·m·yr (n = 193; SE = 16.04), which are lower than previous estimates.
滨海植被生态系统因其能够固存有机碳（OC）而被认可，这种有机碳被称为蓝碳。然而，全球蓝碳核算并不完整，南半球的数据存在很大空白。它还显示出很大的可变性，这表明环境和生物驱动因素之间的相互作用在当地尺度上很重要。在西南大西洋盐沼中，为了说明蟹洞占据的空间，避免高估是关键。在这里，我们发现南西南大西洋盐沼平均储存 42.43（SE=27.56）Mg OC·ha（40.74（SE=2.7）在地下），平均每年埋藏 47.62 g OC·m·yr（范围为 7.38 至 204.21）。淤积率、粒度、植物物种和挖洞蟹被确定为决定地下 OC 储量的主要因素。这些数据导致了更新的全球盐沼储量估计为 185.89 Mg OC·ha（n=743；SE=4.92）和 199.61 g OC·m·yr（n=193；SE=16.04）的埋藏率，这低于以前的估计。
