Spatiotemporal changes in urban forest carbon sequestration capacity and its potential drivers in an urban agglomeration: Implications for urban CO2 emission mitigation under China’s rapid urbanization

作者：Wenhai Hong, Zhibin Ren, Yüjie Guo, Chengcong Wang, Feng Cao, Peng Zhang, Shengyang Hong, Zijun Ma · 发表于：Ecological Indicators · 年份：2024 · 被引用次数：59 · 研究领域：Land Use and Ecosystem Services、Urban Green Space and Health、Urban Heat Island Mitigation

Urban forests can absorb carbon dioxide for urban CO2 emission mitigation. However, the potential capacity of urban forest carbon sequestration (CS) and its drivers remain unclear in urban agglomerations under rapid urbanization. In our study, the net primary productivity (NPP) of built-up areas was reconstructed in the Harbin-Changchun urban agglomeration (HCUA) from 2000 to 2020 to reflect urban forest CS, and the drivers of spatial urban forest CS patterns were further explored using the Geodetector model. Our results showed that the HCUA has experienced rapid urbanization over the past 20 years. Across the urbanization gradient, the CS capacity was higher in new developing built-up areas than in the old developed built-up areas for all years. The CS capacity of urban forests increased gradually from 2000 to 2020, especially in large built-up areas. The urban forest CS was skewed toward low (<100 g·m−2) and medium value (100–300 g·m−2) class distributions in all years; however, the proportion of high CS (>300 g·m−2) show an overall increasing trend from 2000 to 2020, especially in small, low-altitude and old developed built-up areas. The total CS of built-up areas increased from 0.35 Mt·C·yr−1 in 2000 to 2.06 Mt·C·yr−1 in 2020, and the urban forests in the HCUA could offset approximately 2.23 % of urban carbon emissions in 2000, increasing to 5.08 % in 2020. Natural factors, such as temperature, mainly determined changes of the spatial urban forest CS distribution. In addi...