Objective Temporal variation characteristics and driving factors of land use carbon emissions in China’s main grain-producing areas were investigated to explore the evolution of future land use patterns and carbon emission trends, thereby providing references for promoting the low-carbon sustainable development of these areas. Methods Based on multi-source data, the IPCC carbon emission coefficient method was used to calculate the carbon emissions from land use in China’s main grain-producing areas from 2000 to 2023. The partial least squares (PLS) regression model and the logarithmic mean Divisia index (LMDI) decomposition model were used to identify the main driving factors of carbon emissions from cultivated land and construction land. The patch-generating land use simulation (PLUS) model and the center-of-gravity model were applied to simulate and analyze future land use patterns and carbon emissions. Results ① From 2000 to 2023, carbon emissions in China’s main grain-producing areas showed a rapid increase, with an overall increase rate of 225.46%, and the period from 2003 to 2011 was the peak growth stage. The total increase of carbon sinks was 31.96%, with growth rates significantly lagging behind those of carbon emissions. At the provincial level, carbon emissions in all provinces showed rapid or extremely rapid growth, whereas carbon sinks showed slow or moderate growth. ② Under the three scenarios of food security, carbon emission reduction, and natural development, land use carbon emissions in 2035 were projected to increase by 27.82%, 20.01%, and 44.31%, respectively, compared with those in 2023. ③ Future changes in land use patterns were categorized into three types: the dynamic adjustment type in Hunan, Hebei, and Anhui provinces, the locally sensitive type in Inner Mongolia, Jiangsu, Sichuan, and Heilongjiang provinces, and the structurally stable type in Jilin, Liaoning, Shandong, Jiangxi, Henan, and Hubei provinces. Conclusion The net carbon emissions in China’s main grain-producing areas continue to increase with significant regional differentiation, and the future growth trend is pronounced. Synergistic pathways for food security and low-carbon development must be established through differentiated spatial management.
文献参数: 蒲万平, 李洋, 张新, 等.中国粮食主产区土地利用碳核算及未来演变趋势[J].水土保持通报,2026,46(3):305-319. Citation:Pu Wanping, Li Yang, Zhang Xin, et al. Carbon accounting and future evolution trends of land use in China’s main grain-producing areas [J]. Bulletin of Soil and Water Conservation,2026,46(3):305-319.
本研究对耕地、林地、草地、水域、建设用地和未利用地6种地类进行碳核算,其中建设用地和耕地为碳源;耕地、林地、草地、水域和未利用地为碳汇。所有碳核算过程均使用Excel实现,所有估算均基于固定系数,未考虑其时间动态性。为了便于计算和比较,统一将CO2,N2O和CH4温室气体折算为标准碳当量。根据IPCC第四次评估报告的规定,折算C当量标准为1 t N2O引发的温室效应等同于298 t CO2所产生的温室效应;1 t CH4引发的温室效应等同于25 t CO2所产生的温室效应。1 t CO2,N2O和CH4所包含的C分别约为0.272 7,81.264 6,6.817 5 t[14]。
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