Study on the Land Use Change and Landscape Pattern Gradient Effect in Lu’ an, Anhui Province

In order to reveal the characteristics of land use change in Lu’ an city and the evolution law of landscape pattern in different topographic grades, the topographic position index, distribution index and landscape index were calculated, and the three remote sensing images and digital elevation data of the study area from 2000 to 2020 were processed by combining land use transfer matrix, dynamic attitude analysis and geoscience information map analysis. The results showed that, the main types of land use in Lu’ an were cultivated land, woodland and grassland, and the circulation area of cultivated land was the largest. Cultivated land and construction land were dominant in low-grade terrain areas; Stable type was the dominant type in landscape change; In grade 2~5 terrain area, CONTAG, SHEI and SHDI had obvious differences with the evolution of years; In 2020, the landscape abundance of the study area would increase. In the future planning of Lu’ an, we should combine the topographic distribution to build economical and intensive land and coordinate the layout of functional land. Based on ecology, expand green industry to the west; Extend the functional scope of the core area, evacuate the population and protect the environment.