基于Chapman-Richards生长模型的城市人工林碳积累特点和影响因素研究——以上海外环绿带为例

In the context of carbon neutrality and urbanization,there remains a notable research gap concerning the carbon sequestration benefits of urban forests and the identification of suitable tree species and management approaches to achieve sustainable carbon sequestration potential.This study examines the dynamics and drivers of urban forest carbon sequestration in Shanghai,one of the most urbanized cities in China.A comprehensive field inventory dataset spanning 20 years was compiled from the Shanghai Green Belt.The total carbon accumulation and growth rates of eight dominant tree species,including mixed and monoculture forests,were quantified and compared.Univariate conditional factor analysis was conducted to explore the impacts of stand-related and anthropogenic factors on carbon accumulation and growth rates.The results indicate that different tree species exhibit varied aboveground carbon growth patterns,and the Chapman-Richards growth function provides a more accurate representation of carbon dynamics.Significant differences in carbon accumulation rates were observed among tree species,and stand-related factors and human factors significantly influenced aboveground carbon accumulation rates.The findings contribute to understanding the advantages of mixed and monoculture forests for carbon sequestration and provide insights for predicting future patterns of change.