Abstract: Based on the land use data of 2000, 2010 and 2020, the characteristics of land use transition in Guangxi were studied through the land use transfer matrix and land use change rate. The ecological and environmental effects of land use transition were further quantitatively analyzed by using the ecological and environmental quality index and ecological contribution rate, and the impact of land use transformation on the ecological and environmental effects was discussed. The results showed that there were great differences in the spatial distribution of land use types in Guangxi. The forest land was mainly distributed in northwest and southeast Guangxi, the cultivated land was distributed in central Guangxi, and the construction land was mainly concentrated in Nanning City, Guilin City and Liuzhou City. During the study period, land use transformation was mainly dominated by the mutual conversion of cultivated land and forest land and the conversion of cultivated land into construction land, and the intensity of the transfer of cultivated land increased. The change of ecological and environmental quality was stable, showing a trend of first decreasing and then increasing, and the mutual transformation of cultivated land and forest land was the dominant factor affecting ecological and environmental quality. Therefore, the government should optimize the land use structure, make intensive use of construction land, protect the quality and quantity of cultivated land, actively implement the policy of protecting forest and grassland, improve the quality of ecological environment, and ensure the sustainable development of the region.

Key words: land use transformation, space-time evolution, ecological and environmental effect, Guangxi