Abstract: Exploring the spatiotemporal variations in ecosystem service value (ESV) is beneficial to clarifying the focus of ecological conservation. Based on the land use data in 2000, 2010, and 2020, the spatial and temporal variations and driving factors of ESV in the Greater Nanchang Metropolitan Area were analyzed by using the equivalent factor, spatial autocorrelation and geographical detection methods. The results showed that land use change in the Greater Nanchang Metropolitan Area mainly displayed increases of construction land (+141.43%) and water area (+12.68%), and decreases of grassland (-12.25%) and cultivated land (-6.31%) from 2000 to 2020. The change type was mainly from forest land to grassland, and from cultivated land to construction land and water area. The ESV in the research area showed a trend of “decreasing first and then increasing”, with an overall increase of 164.38×10⁸ yuan, which was mainly due to the increase of water area and wetland area. From a spatial perspective, the ESV in Poyang Lake region was the highest, which decreased to the surrounding areas. The ESV in the western region was higher than that in the southern region. From the perspective of spatial autocorrelation of ESV, the local correlation showed a trend of “high in the center and low in periphery”, with high-high concentration areas being distributed in the Poyang Lake area, and low-low concentration areas mainly in the south of the study area. From 2000 to 2020, the spatial agglomeration effect of ESV in the study area gradually decreased. Vegetation cover change was a key factor affecting spatial variations of ESV in the study area, and natural and social factors interactively affected ESV spatial differentiation. Our results provide scientific basis for the ecological protection of regional territorial space.

Key words: ecosystem service value (ESV), spatial and temporal differentiation, geographical detector, Great Nanchang Metropolitan Area