成都市近 15 年景观格局演变特征及其影响因素.

Based on the data of land use, urbanization rate and green cover in Chengdu from 2005 to 2020, landscape pattern index and regression analysis were used to explore the evolution of landscape pattern and its influencing factors in Chengdu in the past 15 years. The results showed that arable land, forest and artificial construction land were the main landscape types, and the area of the three landscape types changed significantly. Arable land landscape was the most dominant landscape, but its area decreased and the degree of fragmentation increased. The area of forest landscape increased year by year, and the degree of fragmentation decreased. The area of artificial construction land increased significantly, the degree of fragmentation increased, and the landscape dominance gradually increased. The overall trend of urban landscape fragmentation was that the connection degree of dominant landscape types gradually decreased, the degree of agglomeration decreased and the complexity increased, and the proportion of each type of landscape tended to be balanced. Urbanization rate was significantly correlated with landscape spread and diversity index. With the increase of urbanization level, the agglomeration degree of various landscapes in Chengdu decreased. Policy factors played an important role in the evolution of landscape patterns. Influenced by the “Park City” policy, the green coverage rate and the area of forest, shrub and grassland increased significantly in 2018. Land use policy was the main factor affecting the change of artificial construction and cultivated land area. The future land use planning should pay attention to the protection of cultivated land. [ABSTRACT FROM AUTHOR]