Flora characteristics of seed plants in the evaluation area of Zoige National Park

This study focuses on the evaluation area of the planned national park in Sichuan and Gansu provinces, covering an area of 23, 338.49 km², to explore the characteristics and features of seed plant flora in Zoige National Park. The geographical coordinates were located between 101°1′49″E—103°24′52″E, 32°9′34″N—34°32′25″N. The composition of seed plants and flora characteristics in the evaluation area of Zoige National Park were analyzed based on field investigation. The results showed that: (1) There were 1757 species of seed plants in 96 families and 454 genera in the evaluation area, including 9 large families (over 50 species) with 908 species, accounting for 51.68%. Compositae, Gramineae, and Rosaceae belonged to Widespread while occupying a dominant position in this region. There were 220 genera singly (only 1 species), accounting for 48.46%, indicating the young and derived evolutionary properties. (2) The distribution of the family can be categorized into 8 types and 7 variants. Apart from Widespread, there were 32 temperate families, accounting for 64.00%, indicating that temperate properties were prominent. There was one East Asian endemic family, namely Circaeasteraceae, with a bearing on ancient flora. (3) The genus distribution could be divided into 14 types and 15 variants. Except for Widespread and Foreign, temperate genera took 90.38% (northern temperate 44.81%), indicating a transition from northern to middle temperate. (4) There were 763 Chinese endemic species, with an apparent specialization from the plateau, including 24 narrow endemic species distributed in Gansu and Sichuan provinces.