Studies On Flora Of Vascular Plant Of Daguishan In Guangxi

Based on the anterior investigation and lieratures reffered,the geographical composition and the charecteristics of the vascular plants flora in Daguishan were studied, and its flora speciality analyzed at the family.genera and species level repectively, and a comparative analysis of the flora and the other four neighboring moutains,discussed the origin of the Daguishan flora. The main results were as folio wings:(1) There are1385vascular plant species (include varieties and forma), belonging to661genera,177families recorded in Daguishan. Among them,91species of pteridophytes, belong to58genera in28families,6species of gymnosperms, belong to5genera in4families,1288species of angiosperms, belong to603genera in145families.(2) The flora performance an obviously tropical characteristic by the families, genera and species. The tropical families, genera and species are20,37and46, covered71.43%,63.79%and50.55%of the total families, genera and species of pteridophytes. The tropical elements occupied a large proportion in the flora of the seed plants, the tropical families are86, with a proportion of57.71%of the total families, the tropical genera are482, occupied79.93%of the total genera, the tropical species are666, occupied51.47%of the total species. The flora shows tropical character.(3) There is no endemic family in Daguishan flora, There are7genera endemic to china,such as Tutcheria, Cunninghamia and so on, and427species are endemic to china recorded in Daguishan, in these species,6species are only found in Guangxi.(4) The dominant families and genera were obvious, genera with single or minor species occupied high proportion, The flora contains a lot of original and ancient ingredients, indicating that flora of the Daguishan was ancient in general.(5) The study compared the flora of the other four moutains, and calculated the comparability coefficients of the plants, the conclusion is the flora have certain comparability in these areas, but they also differ to a certain extent. The ingredient of the flora is transition, it is the connection area of the Guangdong and Guangxi flora.(6) Daguishan flora contains a lot of original and ancient Cathaysian flora elements, It was bred and devolepmented by the Cathaysian flora.