基于InVEST模型的四川省宜宾市2010—2020年碳承载力评价

Carbon Carrying Capacity Evaluation for Yibin City of Sichuan Province Based on InVEST Model Duing 2010-2020

[目的]探究城市碳承载力基底,为城市“双碳”目标实现和低碳发展提供科学支撑。[方法]基于2000,2005,2010,2015,2020年四川省宜宾市土地利用数据,通过InVEST模型测度了宜宾市生境质量和碳储存量,构建了宜宾市碳承载力评价指标体系,对宜宾市的碳承载力水平进行深度地分析研究。[结果]宜宾市碳承载力呈现“先提升,后下降,再提升”的变化特征,2000,2005,2010,2015,2020年宜宾市碳承载力得分分别为0.5254,0.6061,0.5064,0.3853,0.5534。生境退化程度持续加深,生境质量指数呈现“先提升,后下降,再提升”的变化特征。碳储存量指数持续上升,碳储存速率持续下降。宜宾市碳承载力复合系统由2000年的失调状态逐渐转变为2020年的中级协调。[结论]宜宾市碳承载力水平整体处于上升趋势,但局部地区碳储量和生境质量下滑较为严重。

[Objective]The basis of urban carbon carrying capacity was determined in order to provide scientific support for urban“double carbon”and low-carbon development.[Methods]Based on land use data for Yibin City,Sichuan Province in 2000,2005,2010,2015,and 2020,habitat quality and carbon storage for Yibin City were measured by the InVEST model,an evaluation index system of carbon carrying capacity for Yibin City was constructed,and an in-depth study of the level of carbon carrying capacity for Yibin City was conducted.[Results]The carbon carrying capacity of Yibin City showed a change pattern of“first increasing,then decreasing,and then increasing”.The carbon carrying capacity scores for Yibin City in 2000,2005,2010,2015,and 2020 were 0.5254,0.6061,0.5064,0.3853,and 0.5534,respectively.The degree of habitat degradation continued to deepen,and the habitat quality index showed a change pattern of“first increasing,then decreasing,and then increasing”.The carbon storage index continued to increase over time,and the carbon storage rate continued to decline.The complex system of carbon carrying capacity for Yibin City has gradually changed from an imbalanced state in 2000 to an intermediate coordination state in 2020.[Conclusion]The level of carbon carrying capacity in Yibin City is on the rise,but carbon storage and habitat quality in some areas are declining significantly.