广州市土地利用变化对碳代谢的影响OA

[Objective]This study aims to reveal the impact of land use changes on carbon metabolism in Guangzhou and provide a reference for promoting the balance of its carbon metabolism system.[Methods]Vertical carbon metabolism in Guangzhou was calculated for the years 2000,2005,2010,2015,and 2020.A geographically weighted regression(GWR)model was used to explore the driving factors of vertical carbon metabolism.Ecological network analysis(ENA)was applied to analyze horizontal carbon metabolism,and GIS spatial analysis was combined to investigate the impact of land use changes(2000-2020)on carbon metabolism in Guangzhou.[Results](1)Carbon emissions in Guangzhou first increased and then decreased,with construction land having the greatest impact.Carbon adsorption by cultivated land and forest land tended to decrease,while adsorption by grassland,water bodies,and unused land remained relatively low and showed limited variation.Construction land area had a positive impact on vertical carbon metabolism,and the effects of elevation,GDP,mean annual precipitation,and nighttime light intensity exhibited significant spatial heterogeneity.(2)Total positive and negative carbon flows both increased initially,then decreased,and subsequently increased again.Positive carbon flows exhibited a dispersed distribution,while negative carbon flows were mainly concentrated in the central and western parts of the study area.(3)Ecological relationships among land types were mainly characterized by predation/constraint interactions and gradually shifted from concentrated to dispersed distribution,affecting the balance of the carbon metabolism system.(4)The symbiosis level of the carbon metabolism system first decreased,then increased,and finally decreased again.[Conclusion]The effects of various factors on vertical carbon metabolism exhibit pronounced spatial heterogeneity.Positive and negative carbon flows show distinct spatial distribution characteristics,and predation/constraint relationships dominate the ecological interactions.Land use changes in Guangzhou first promoted but later disrupted the carbon metabolism balance.