Status Quo and Evaluation of Natural Resources of Emphasis Protective Wilding Plants in Guangxi
Liu Yan Ning Shijiang (Guangxi Institute of Botany,Yanshan,Guilin,Guangxi,514006,China)
A survey was conducted in Guangxi region from Otc.1997 to June 2001. Sample plot is used for the plants with narrow distribution area;one by one check for the plants with small distribution area;Sample plot supplemented belts and unit routes for the plants of wide distribution in local area and region.The plants are sorted out by the taxonomic system in the book of China Fauna.Seventy five of the listed plants are found, of which 22 species are the national class Ⅰprotective plants, 40 species the national classⅡprotective plants,13 species the provincial protective plants 17 species are special for Guangxi,and 58 species special for the nation. The tropical component is predominant in all plants.The antique species account for 50% of total species.Cinnamomum camphoraand Cibotium barometzare widely distributed in Guangxi.Burretiodendron hsienmu,Zenia insignis and Dracaena cochinchinensis are widely distributed in the karst area of southern Guangxi.The distribution area of other species is quite small.Only two species have one million upward individuals,accounting for 2 7% of total emphasis protective wilding plants in Guangxi;8 species 100000 to one million, accounting for 10 6%;9 species 10000 to 100000,accounting for 12 0%;20 species in 1000 to 10000,accounting for 26 7%;24 species in 100 to 1000,accounting for 32 0%;11 species less 100,accounting for 14 7%.Some species are much less,such as Erythropsis kwangsiensis,only three individuals;Glyptostrobus pensilis,9 individuals.14 listed plants are not found in the survey. Among them, two species are the national classⅠprotective plants;7 species are the national classⅡprotective plants; and 5 species are the provincial protective plants.