The Qinling-Daba Mountains, within the watersheds of both the Yangtze River and Yellow River, form a natural boundary of geography and climate between north and south China, which are primarily important to the formation and variation of the geographic and ecological environment in central China. They extend from the Qinghai-Tibet Plateau in the west to the eastern plain of China, across 8 degrees of longitude in the east-west direction, forming a “bridge” that connects the Qinghai-Tibet Plateau and the eastern plain of China. Therefore, their physical geography is characterized by connection in the east-west direction and transition in the north-south direction, and zonation and azonation factors work together to form complex and diverse mountain altitudinal belts. Research on the structure, characteristics, quantity, height, and distribution mode of the altitudinal zonation structure plays a crucial role in exploring the complex ecological and geographic patterns in the Qinling-Daba Mountains, recognizing the specific location of the north-south divide of China, and explaining the mountain biodiversity and its response to global climate changes.
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