Objective The forest carbon sink value in the Inner Mongolia Autonomous Region was quantified, and pathways for realizing the value of ecological products were explored, in order to deeply understand the intrinsic mechanism of changes in the carbon sink value of forests in this area and provide theoretical references for promoting the sustainable management and value realization of forest ecological products. Methods The study focused on twelve prefecture-level cities (leagues) in the Inner Mongolia Autonomous Region, covering the period from 2009 to 2023. A multimetric framework was developed to quantify forest carbon sinks and analyze their spatiotemporal evolution, integrating carbon sequestration rate, optimal pricing, carbon tax, and afforestation cost methods for CO2 fixation. In addition, multiple regression models and grey relational analysis were employed to assess influencing factors and the degree of inter-factor association, thereby identifying potential pathways for realizing the value of forest carbon sink-based ecological products. Results ① The forest carbon sinks of all prefecture-level cities (leagues) in Inner Mongolia increased significantly, with the most notable growth observed in 2014. The total increase ranged from 160% to 200%, with Wuhai City, Bayan Nur City, and Ulanqab City exceeding 240%, and Ordos experiencing an increase of more than 50-fold. ② The forest carbon sink value in each prefecture-level city (league) showed an overall upward trend, with the fastest growth occurring in the central regions. Spatially, the pattern was characterized by higher values in the east and lower values in the west, with peak values in the northeast, declining from the northern and southern edges toward the center in the midland areas, and from northwest to southeast in the western regions. ③ Differences in geographical location, industrial structure, policy orientation, and forest age structure among the prefecture-level cities (leagues) resulted in significant spatial heterogeneity in the operational mechanisms and intensity of influencing factors. Specifically, Wuhai City, Bayan Nur City, Hinggan League, and Hulunbuir City exhibited stronger inter-factor correlations, while Alxa League, Hohhot City, and Chifeng City showed relatively weaker associations. The primary influencing factors included economic development, precipitation, forestry output value, forest coverage, and the scale of forest investment. Conclusion Forest carbon sink volume and value in Inner Mongolia displayed significant regional differentiation. Future policies should formulate carbon sink development strategies tailored to local conditions based on each prefecture-level city’s (league’s) resource endowments and ecological function positioning. Differentiated pathways for realizing forest carbon sink product value should be explored to promote efficient transformation and value realization through region-specific, refined management in Inner Mongolia.
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式中:FC ij 为第i个盟市第j年的森林生态系统碳汇量(t/a); FCSR为森林植被固碳速率〔(t/(hm2 ‧ a)〕; SF ij 为第i个盟市第j年的森林面积(hm2); 为林下植物碳转换系数,取IPCC默认值0.195; FCSS为森林土壤固碳速率〔t/(hm2 ‧ a)〕; 为C转化为CO2的转换系数44/12。
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