Study on the Flora of Seed Plants in Juniperus przewalskii Community in Qinghai Province

Taking the Juniperus przewalskii community in Qinghai Province as the research object, the survey method is mainly based on sample plot survey and supplemented by sample line survey, the seed plants of 42 sample plots of J. przewalskii community in Zeku County, Xinghai County, Delingha City, Wulan County, Dulan County, Qilian County and Huzhu County were investigated, on this basis, the method of floristic geography was used, and the flora characteristics of the community seed plants were analyzed. The results show that there are 41 families, 136 genera, and 258 species of seed plants in community. The main plants are Asteraceae, Rosaceae, Ranunculaceae, and Fabaceae, with abundant genera with 1 species, and with 2−4 species; there are 171 species of perennial herbs, occupying an absolute predominance(66.28%). There are 4 areal-types of families, mainly distributed around the world; There are 12 areal-types of the genera, 100 genera belonged to temperate elements, accounting for 88.50% of the total number of genera. There are 3 genera endemic to China; there are 106 species endemic to China, mainly endemic to the Qinghai-Tibet Plateau. They had both North China, Southwest-North China, and Southwest components. Only 1 species of Gentiana aperta is endemic to Qinghai. Huzhu County has the most abundant seed plants, and the least in Delingha City. The communities of Zeku, Huzhu, and Xinghai are similar in composition, and Delingha, Dulan, and Wulan are similar in composition. The seed plant flora of J. przewalskii community in Qinghai Province is rich; temperate nature is remarkable; Chinese endemic genera are poor, Chinese endemic species are abundant, but native endemic species are poor; the composition of seed plants and the similarity among genera of J. przewalskii community in different regions are different.