Bar-On Yinon M, Li Xiaojun, O'Sullivan Michael, Wigneron Jean-Pierre, Sitch Stephen, Ciais Philippe, Frankenberg Christian, Fischer Woodward W
Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, CA, USA.
Earth and Planetary Sciences, Weizmann Institute of Science, Rehovot, Israel.
Science. 2025 Mar 21;387(6740):1291-1295. doi: 10.1126/science.adk1637. Epub 2025 Mar 20.
Terrestrial sequestration of carbon has mitigated ≈30% of anthropogenic carbon emissions. However, its distribution across different pools, live or dead biomass and soil and sedimentary organic carbon, remains uncertain. Analyzing global observational datasets of changes in terrestrial carbon pools, we found that ≈35 ± 14 gigatons of carbon (GtC) have been sequestered on land between 1992 and 2019, whereas live biomass changed by ≈1 ± 7 GtC. Global vegetation models instead imply that sequestration has been mostly in live biomass. We identify key processes not included in most models that can explain this discrepancy. Most terrestrial carbon gains are sequestered as nonliving matter and thus are more persistent than previously appreciated, with a substantial fraction linked to human activities such as river damming, wood harvest, and garbage disposal in landfills.
陆地碳固存已缓解了约30%的人为碳排放。然而，其在不同碳库（活生物量或死生物量以及土壤和沉积有机碳）中的分布仍不确定。通过分析陆地碳库变化的全球观测数据集，我们发现1992年至2019年间陆地已固存了约35±14十亿吨碳（GtC），而活生物量变化了约1±7 GtC。相反，全球植被模型表明碳固存主要发生在活生物量中。我们识别出了大多数模型未包含的能解释这种差异的关键过程。大多数陆地碳增量被固存为非生物物质，因此比之前认为的更持久，其中很大一部分与人类活动有关，如筑坝、木材采伐和垃圾填埋场的垃圾处理。
