Background Located in Beibei district, Chongqing Jinyun Mountain National Nature Reserve has a subtropical monsoon humid climate. The annual average temperature is 13.6 ℃, the annual rainfall is 1 611.8 mm and the annual average relative humidity is 87%. The favorable environment provides a suitable living environment for plants. As a typical subtropical evergreen broad-leaved forest area and gene bank of plant species in the middle and upper reaches of the Yangtze River, there is high protection value and scientific research value for the protected area.

Methods The algae were collected qualitatively with plankton net, after fixed and treated, the qualitative samples were photographed and identified under a microscope. A combination of line transect method and sample method was used to collect samples of large fungal entities, after recording their physiological and ecological characteristics, traditional morphological classification and chemical reagent reaction were used to identify them.All bryophytes in the quadrat were collected in proportion, and the characteristics of plant bodies and spores were observed, measured and recorded under anatomic microscope and optical microscope.The vascular plants were investigated and counted by transect and sampling methods.

Results 1) A total of 338 families, 1 171 genera and 2 408 species of plants exist in Jinyun Mountain. Among them, there are 8 genera, 28 families, and 206 species of algae; 19 orders, 51 families, 109 genera, and 184 species of macrofungi; 55 families, 112 genera, and 244 species of bryophytes; 204 families, 890 genera, 1 774 species of vascular plants.2)Diatom, which likes flowing water, is the dominant species, and green algae, which likes still water, is the dominant group. In the study area, the distribution of macrofungi is mainly distributed in the world (84 genera, accounting for 77.06% of the total genera), followed by pantropical distribution (16 genera, accounting for 14.68% of the total genera), and the distribution of macrofungi in the North temperate zone is the least (9 genera, accounting for 14.68% of the total genera). 8.26% of the total genera). The composition of bryophyte flora is complex, with obvious tropical characteristics, and a certain proportion of the distribution of temperate and east Asian bryophyte, bundle plants mainly tropical distribution.3)Among the vascular plants, there are 26 genera endemic to China (see Table 8 for details), accounting for 10.7% of the total number of genera endemic to China (243). There were 55 species under state key protection in Jinyun Mountain.

Conclusions The above data prove that the plant has plenty of richness and diversity and high rarity of Jinyun Mountain, which is one of the important characteristics of plant diversity in Jinyun Mountain, but the research is only a plant diversity in Jinyun Mountain census, failed to combine the unique soil hydrological characteristics of Jinyun Mountain or climate conditions to analyze the correlation of plant distribution.Future studies will combine environmental factors and plant diversity for further analysis.