据研究人员介绍，陆地光合作用每年祛除的二氧化碳(CO2)是化石燃料排放的六倍。然而，碳主要通过分解返回到大气中。
研究发现，一根3775年前的古原木被埋藏在地下2米处，它的保存时间远远超过了预期的寿命。这些木材保存得近乎完美，与现代样品相比，碳损失不到5%。可能是由于其埋藏地点的致密粘土渗透性低，原木没有腐烂。
研究观察提出了一种混合的自然—工程方法，通过将木质生物质埋在类似的缺氧环境中来去除碳。研究人员估计，利用现有技术，以每吨30至100美元的低成本优化后，全球每年可封存高达100亿吨的CO2。
附：英文原文
Title: 3775-year-old wood burial supports “wood vaulting” as a durable carbon removal method
Author: Ning Zeng, Xinpeng Zhao, Ghislain Poisson, Bryson Clifford, Yu Liu, He Liu, Taotao Meng, Laura Picard, Elisa Zeng-Mariotti, Ben Zaitchik, Liangbing Hu
Issue&Volume: 2024-09-27
Abstract: Six-times more carbon dioxide (CO2) is removed each year by terrestrial photosynthesis than fossil fuel emissions. However, the carbon is mostly returned to the atmosphere by decomposition. We found a 3775-year-old ancient wood log buried 2 meters belowground that was preserved far beyond its expected lifetime. The wood had near-perfect preservation, with carbon loss less than 5% compared to a modern sample. The lack of decay is likely due to the low permeability of the compact clay soil at the burial site. Our observation suggests a hybrid nature-engineering approach for carbon removal by burying woody biomass in similar anoxic environments. We estimate a global sequestration potential of up to 10 gigatonnes CO2 per year with existing technology at a low cost of $30 to $100 per tonne after optimization.
DOI: adm8133
