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A large carbon sink induced by the implementation of the largest afforestation program on Earth
Ecological Processes ( IF 4.8 ) Pub Date : 2023-09-08 , DOI: 10.1186/s13717-023-00455-8 Jiaojun Zhu , Yirong Sun , Xiao Zheng , Kai Yang , G. Geoff Wang , Chaozong Xia , Tao Sun , Jinxin Zhang
Ecological Processes ( IF 4.8 ) Pub Date : 2023-09-08 , DOI: 10.1186/s13717-023-00455-8 Jiaojun Zhu , Yirong Sun , Xiao Zheng , Kai Yang , G. Geoff Wang , Chaozong Xia , Tao Sun , Jinxin Zhang
Three-North Afforestation Program (TNAP) in China is the largest ecological restoration project on Earth (ongoing from 1978 to 2050), harboring a huge area of newly planted forests, which provides a wealth of goods and ecosystem services that benefit society at levels ranging from region to East Asia. This project-induced carbon (C) sink has been expected to be large, but its size and location remain uncertain. In this study, we investigated the changes in the C stocks of biomass, soil C and the C accumulation benefited from the ecological effects in the project areas from 1978 to 2017 within the Three-North regions (4.069 × 106 km2), and evaluated its project-induced C sequestration. Using a combination of remote sensing images, field observations and national forest inventory data, we estimated a total ecosystem sink of 47.06 Tg C per year (1 Tg = 1012 g) increased by the TNAP implementation. Importantly, we first found that the C sink via the ecological effects of this project could contribute to a high proportion up to 15.94%, indicating a critical role of ecological effects in shaping the distribution of C stocks in the protective forests. This finding suggests that it is necessary to explicitly consider carbon sequestration benefited from the ecological effects when estimating C sink and parameterizing C models of the restoration projects in China and globally. Our results update the estimates of C pools in the world's largest ecological restoration project area, demonstrating that this project has substantially contributed to mitigating the climate change.
更新日期：2023-09-08
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