2026-09-02 中国科学院（CAS）
＜関連情報＞
- https://english.cas.cn/newsroom/research-news/202609/t20260902_1189692.shtml
- https://www.nature.com/articles/s41561-026-02074-2
1986年から2019年にかけて、中国の森林炭素吸収源は主に森林再生によって占められていた Reforestation dominated China’s forest carbon sink from 1986 to 2019
Wenru Xu,Zhihua Liu,Philippe Ciais,Wei Li,Yidi Xu,Hong S. He,Jian Yang,Wenjuan Wang,Nianpeng He,Kewei Jiao,Chao Huang,Yangjian Zhang & Jiaojun Zhu
Nature Geoscience Published:17 August 2026
DOI:https://doi.org/10.1038/s41561-026-02074-2
Abstract
China, the world’s largest CO2 emitter, leverages forest area expansion as a strategy to achieve carbon neutrality by the 2060s. However, the respective contribution of reforestation on previously forested land and afforestation on non-forested land, remains uncertain due to limited observational data and the absence of spatially and temporally explicit analyses. Here we used locally derived aboveground biomass accumulation curves for each 1° grid cell and a spatially explicit bookkeeping model to track annual carbon uptake from reforestation and afforestation alongside emissions from forest disturbances. We then estimated the forest carbon balance of China for different forest types at 30 m resolution from 1986 to 2019. Forest biomass carbon sinks averaged 0.139 ± 0.052 PgC yr−1, increasing from 0.1 ± 0.015 PgC yr−1 in the 1990s to 0.2 ± 0.012 PgC yr−1 in the 2010s. Despite afforested tree cover expanding faster (1.31 Mha yr⁻1) than reforestation after disturbance (1.06 Mha yr⁻1), post-disturbance regrowth exhibited a higher growth rate (1.47 ± 0.42 MgC ha−1 yr−1) in carbon sequestration than that of afforestation (0.96 ± 0.28 MgC ha−1 yr−1), making reforestation the dominant contributor to China’s forest carbon sink over the past three decades. The results inform forest carbon accounting and prioritize protecting regrowing forests alongside targeted afforestation to achieve carbon neutrality.
