Floristic Geography Of Huating In Gansu Province

In this paper,through the study of the related literatures and field work, the geographic distribution types at the species% genera and family levels were identified and taken into statistical analysis to the plant species resources of Huating,then compared with adjacent area to identify the relationships of floristic similarity among them. The conclusion is as follows1. Plant resources of Huating are abundant, consisted of 118 families,508 genera,1231 species of seed plants, was 65.19%、44.84%、25.17% of the total number of families、genera and species in Gansu Province,which have a certain position on the whole content of the plant species resources of gansu province occupies.2. The temperate properties of the flora were obvious. The areal-types of families、genera、 species of seed plants in Huating was given priority to with temperate components. In addition,The dominant families and dominant genera also belonged to temperate elements.3. The composition is diversif ie and has a transitional character.The families of Huating seed plants were divided into 9 areal types,7 variants,and the genera can be divided into 15 distribution types 16 variants,nearly Covers all distribution type excpet a few variant. Tropical composition still account for 18.85% of the total number of genera in this area with a larger proportion,which suggested the features of transitional flora in Huating.4.The endemic species in Huating were abundant in a total of 11 Chinese endemic genus,315 species endemic to China, and nine endemic species in gansu province.5. The origin of the flora is old,The aneient elements take the dominant Position.6. The similarity coeffieients between Xiaolong Mountain and Taibai Mountain are the highest, the lower ones are those between Kongtong Mountain、Liupan Mountain、Ziwuling Forest Region and Maiji Mountain, the lowest ones are Qilian Mountain and Helan Mountain.