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Using the land use data in 1980, 1990, 1995, 2000, 2005, 2010 and 2015 in the upper reaches of the Yangtze River(UYRB), the area and changes of various types of land use in the study area were analyzed, and the transformation characteristics of various land use types were expounded. Suitable landscape indices such as Patch Number(NP), Patch Density (PD), Connectivity Index (COHESION) and Shannon Diversity Index (SHDI)were used to explore and analyze the land use pattern of the study area. The results showed that from 1980 to 2015, farmland, forest and grassland were the main land use types in the UYRB. The area of construction land and grassland increased, the area of farmland, forest, wetland and desert decreased, and the area of lake/river did not change much. The main direction of land use type transfer in the study area was the conversion of farmland to forest, grassland and construction land, grassland to forest, wetland to lake/river, and desert to grassland. Through the analysis of landscape level indicators, it is concluded that the degree of landscape fragmentation in the UYRB in the past 20 years has gradually increased, the heterogeneity of the landscape has gradually increased, and the types of land use have developed towards diversification. Through the analysis of the patch type level indicators in the study area, results showed that farmland, forest and grassland occupied an absolute dominant position in the study area, resulting in a large separation of the rest of the landscape types. The separation of farmland and construction land under the strong interference of human activities, Fragmentation showed a trend of first decreasing and then increasing.

The land use pattern and its changes in the upper reaches of the Yangtze River from 1980 to 2015