Abstract: There are 28 species of nationally preserved wild plants in Gansu Province,Northwestern China. Among them, 7 species(Cycas revoluta,Ginkgo biloba,Taxus chinensis,Metasequoia glyptos teoboides,Dabidia irvolucrata,Dabidia irvolucrata var. vilmoriaiana,and Kingdonia uniflora)belong to first class nationally protected plants, accounting for 13.73% the list. The rest 21 species(Gupressus chengiana,Abies chensiensis,Picea neoveitchii,Tarreya fargesii,Cercidiphyllum japonicum,Cinnamomum longepaniculatum,Ormosia hosimei,Glycine soja,Toona ciliata,Liriodendron chinense,Magnolia officinalis,Magnolia officinalis sub. Biloba,Magnolia wilsonii,Fraximus mandschurica, Emmenopterys henryi,Frankenia pulverulenta,Zelkova schneideriana,Tetracentron sinensis,Camptother acuminata,Nostoc flagelliforme,and Cardyceps sinensis), account for 10.40% of the 202 second class nationally protected plant species. The study on biodiversity and distribution of nationally preserved plants in Gansu will provide scientific basis for their protection and utilization.

Key words: Bird island, Qinghai Lake, Species diversity, Soil environmental factors