2023-07-25 カリフォルニア大学バークレー校(UCB)
◆地球の陸上生態系は「地球の炭素貯留地」と呼ばれ、人間の炭素排出の約1/3を吸収し、温室効果ガス排出の影響を軽減しています。この貯留地の能力は、植物の炭素吸収と温暖化により増加してきましたが、森林伐採や気候変動によるストレスにより減少傾向が続いています。もし現状が続くと、数十年以内に炭素の源に変わる可能性があり、その結果、気候変動が加速する恐れがあります。
◆持続可能な土地管理の実施が必要であり、論文は気候変動対策や地球の炭素循環に関する重要な示唆を提供しています。
＜関連情報＞
- https://nature.berkeley.edu/news/2023/07/quantifying-strength-land-carbon-sink
- https://www.nature.com/articles/s43017-023-00456-3
陸域炭素吸収源強化の証拠と帰属 Evidence and attribution of the enhanced land carbon sink
Sophie Ruehr,Trevor F. Keenan,Christopher Williams,Yu Zhou,Xinchen Lu,Ana Bastos,Josep G. Canadell,Iain Colin Prentice,Stephen Sitch & César Terrer
Nature Reviews Earth & Environment Published:25 July 2023
DOI:https://doi.org/10.1038/s43017-023-00456-3
Abstract
Climate change has been partially mitigated by an increasing net land carbon sink in the terrestrial biosphere; understanding the processes that drive this sink is thus essential for protecting, managing and projecting this important ecosystem service. In this Review, we examine evidence for an enhanced land carbon sink and attribute the observed response to drivers and processes. This sink has doubled from 1.2 ± 0.5 PgC yr−1 in the 1960s to 3.1 ± 0.6 PgC yr−1 in the 2010s. This trend results largely from carbon dioxide fertilization increasing photosynthesis (driving an increase in the annual land carbon sink of >2 PgC globally since 1900), mainly in tropical forest regions, and elevated temperatures reducing cold limitation, mainly at higher latitudes. Continued long-term land carbon sequestration is possible through the end of this century under multiple emissions scenarios, especially if nature-based climate solutions and appropriate ecosystem management are used. A new generation of globally distributed field experiments is needed to improve understanding of future carbon sink potential by measuring belowground carbon release, the response to carbon dioxide enrichment, and long-term shifts in carbon allocation and turnover.
