Abstract:

In order to understand the resources and floristic characteristics of national key protected wild plants in Bailongjiang basin, we surveyed wild plant resources in the study area by field measurement method and typical sampling method. The research data was analyzed combining with literature review. The results show that: (1) there are 19 national key protected plants, which belong to 15 families and 18 genera, including 3 species of the national protection category I and 16 species of the national protection category II; (2) the national key protected wild plants have no concentrated distribution in the study area and mainly scatter in the lower and middle reaches of the basin, accounting for 95% and 74% of the total national key protection wild plants of the this area, respectively; (3) the floristic characteristics of the wild plants in Bailongjiang basin are complex and diverse, and the floristic geography of plant family and genera can basically be divided into 6 distribution types. This study indicates that the floristic geography of wild plants in Bailongjiang basin is mainly temperate, showing a transition from tropical zone to warm temperate zone, and has abundant unique Chinese components. Most species have narrow distribution range, rare populations and special habitat requirements, which are not conducive to the diffusion and reproduction of plant populations.

Key words: Gansu Province, Bailongjiang basin, national key protected wild plants, floristic geography