Land Use Change Monitoring and Carbon Storage Assessment in Qingyuan City Using the InVEST Model

Abstract

To analyze the spatial and temporal distribution characteristics of land use change and carbon stock in Qingyuan City from 1990 to 2020 and the relationship between them, to provide theoretical decision-making references for balancing economic development and ecological civilization construction and promoting rural revitalization. Based on remote sensing data, ArcGIS was used for land use change visualization, and the Carbon module of the InVEST model was used to estimate carbon stocks to explore the impact of Land Use and Cover Change (LUCC) on carbon stocks. The results show that from 1990 to 2020, the area of cultivated land, forest land, and grassland in Qingyuan City decreased, the area of construction land and water area increased, and the size of the unused land area remained unchanged. The land use type with the largest share of carbon stocks is forest land, and the smallest is unused land. The total carbon stock was 132,300,135 Mg (mega gram) in 1990 and 131,613,007 Mg in 2020, a decrease of 687,128 Mg in total carbon stock. Changes in the area of grasslands leading to changes in the area of carbon stocks are the most obvious, and the conversion of cultivated land, forested land, and grasslands to construction land is the main cause of the loss of carbon stocks..