Study on Dynamic Changes of Landscape Pattern in Qionglai Mountain-Daxiangling Area of Giant Panda National Park

Based on the remote sensing images and land use data of Qionglai Mountain-Daxiangling area in Giant Panda National Park from 1995 to 2018, the landscape pattern status and fragmentation degree of each period in the study area were comparatively analyzed by using morphological spatial pattern analysis, transition matrix and dynamic degree model, landscape pattern index and other methods. The results showed that: (1) The structural elements of GI network in the study area were mainly the core area, and other elements were scattered; (2) The woodland and grassland accounted for more than 96% of the total area, which were the two dominant landscape types in the study area. Except for the overall reduction of grassland and unused land, the area of other landscape types had generally increased. (3) The shift of landscape types in different periods mainly occurred between woodland, grassland and cultivated land, and the dynamic change of construction land was the largest from 2007 to 2013. (4) According to the results of the landscape pattern index, at the patch type level, the fragmentation degree of the six major landscape types increased, and the dominance of woodland and grassland were decreased. On the landscape level, the fragmentation, diversity and shape complexity of the landscape in the study area was generally increased, while the degree of spread and aggregation were generally reduced and the overall connectivity was poor. Finally, aiming at the above problems, some suggestions on landscape pattern optimization were put forward. The research can provide data support and theoretical reference for the ecological environmental protection and management of the Qionglai Mountain-Daxiangling area of the Giant Panda National Park.