Abstract: To scientifically evaluate the implementation effects of ecological protection and restoration projects,it is crucial to study monitoring techniques for the carbon sink effectiveness of ecological protection and restoration.This paper takes the integrated protection and restoration project in the Dongting Lake region as the research object,and constructs a “space-air-ground” integrated carbon sink monitoring method driven by remote sensing data.It systematically assesses the vegetation carbon storage and soil carbon storage in 2023 and 2024,as well as the carbon sink capacity before and after the restoration of typical sample plots,and analyzes the spatial distribution characteristics.The results show that:①The vegetation carbon storage increased from 2.332 4 million tons to 6.881 4 million tons,and the soil carbon storage increased from 9.407 8 million tons to 13.166 1 million tons.②The vegetation carbon storage and soil carbon storage show a spatial distribution pattern of being higher in the west and lower in the east.③The annual carbon sink capacity of the typical sample plot increased from 669.78 kg CO₂ to 1 231.36 kg CO₂ before and after restoration.This paper can provide technical reference for the carbon sink effect monitoring of large-scale ecological restoration projects and provide scientific basis for the ecological protection and restoration of the Yangtze River Economic Belt.

Key words: ecological protection and restoration, carbon sink, effectiveness monitoring, carbon stock estimation, Dongting Lake region