Study On Floristics Of Vascular Plants And Plant Resources Of Guangxi Beibu Gulf Coastal Zone

The floristic composition geographical element, relationship with its neighboring regions, based on vegetation investigation and document data, were studied according to applying floristic plant geography principle in Guangxi Beibu Gulf Coastal Zone; wild plant resources, rare and endangered plant were analyzed based on statistics of the wild vascular plant and document data in the zone. The result as follows:1. The floristic composition of vascular plant in Guangxi Beibu Gulf Coastal Zone is relatively rich and diverse. Besides, the floristics of vascular plant is ancient and its geographical element is complex. It shows the obvious tropical properties in the zone.1029vascular plant species, belonging to616genera and185families, are distributed in Guangxi Beibu Gulf Coastal Zone. Among them, there are888species of wild vascular plant belonging to527genera and168families,47invasive plants belonging to42genera and22families,94cultivated plants belonging to76genera and53families. Among the wild vascular plant, there are45species of pteridophytes belonging to31genera and24families,8species of gymnosperm belonging to5genera and4families,676species of dicotyledon belonging396genera and111families,159species of monocotyledon belonging to95genera and29families.Families and genera of the wild vascular plant studied in the zone show that the mono-specific family(the families contains1species in the zone), oligo-specific family(the families'contain2to4species in the zone), mono-specific genus(the genus contains1species in the zone), oligo-specific genus(the genus contains2to4species in the zone) are dominant, and multi-specific family, multi-specific genus aren't obvious on the number of family and genus. Many specifics of the multi-specific family, multi-specific genus are dominant and significant, which impact the complexity and diversity of the flora. By analyzing the statistics, we can learn that the life form of vascular plant are diversity, and the aiphyllium and liana are dominant, which suggest that the floristics composition is complex diversity.By analyzing the geographical component, it shows that the families of wild vascular plant are divided into8types and5subtypes. Among them, there are103families belonging to tropical type, occupied84.44%of the total non-cosmopolitan families. And in the tropical type,65families belong to the pantropic type, occupied53.28%of the total non-cosmopolitan families. The genera of wild vascular plant are divided into13type and16subtype, among which, the distribution type of431genus belong to tropical type, occupied81.78%of the total non-cosmopolition genera. And in the tropical type,160genus belong to pantropic type, occupied30.36%of the total non-cosmopotitan genera. It shows the complexity of geographical components, the dominance of distribution type of pantropic, and the obvious tropical properties.According to the comparison of R/T (tropic genera/temperate genera) and the analysis of the floristic spectrum, it shows the flora belonging to palaeotropic is ancient and has obvious tropical properties, which is relatively similar with the flora of Jiulong Mountain in Leizhou and Hainan. To a certain extent, the latitude, geological features, climate characteristics in different regions has more similarity, the flora is more similar.Studying on the endemics of floristics shows the endemic plants are comparatively poor in Guangxi Beibu Gulf Coastal Zone. The reason for that is that the vegetation and evergreen seasonal rain forest may has been long-term damage, there are no endemic family, only2genera endemic to china and74species endemic belonging57genera and39families. Among them, there are2ptendophytes species belonging to1genera and1family,72angiosperms species belong to56genera and38families. Only6species endemic to Guangxi are recorded in Guangxi Beibu Gulf Coastal Zone, which belong to5genera and5families and account for0.69%of the endemic plant in Guangxi.Seven newly recorded genera, fifteen newly recorded species for Guangxi and1newly recorded species for china are found in Guangxi Beibu Gulf Coastal Zone.2. According to wild vascular plant economic uses, which are divided into medicinal plants(394species), timber plants(86species), fiber plants(84species), protein plants(61species), starch pants(26species), oil plants(87species), vitamin plants(6species), sugar and non-sugar sweeteners plants(6species), pigment plants(4species), aromatic plants(35species), tannin plants(54species), resin and gum plant(18species), flower garden plants(160), Nectar plants (58species) and other plant resources which include sand-fixing plants(22species), anti-pollution plants(ll species), green manure plants(7) and feed plants(62species). Although types of plant resources are numerous and high diverse, but there are few resources reserves and small potential for development and utilization. In addition, some plant resources have endangered in this region, such as Alsophila podophylla, Ceratopteris thalictroides, Aquilaria sinensis, Camellia euphlebia, Erythrophleum fordii, Ixonanthes reticulate, Antiaris toxicaria, and so on.3. More rare and endangered plants distributed on the Guangxi Beibu Gulf Coastal Zone. There are43rare and endangered species, account for4.84%of wild vascular plant in the Guangxi Beibu Gulf Coastal Zone. Among them, there are2species (Glyptostrobus pensilis and Bhesa robusta) under first class state protection, eleven species(Alsophila podophylla, Ceratopteris thalictroides, Cinnamomum hupehanum, Albertisia laurifolia, Aquilaria sinensis, Camellia euphlebia, Erythrophleum fordii, Dalbergia odorifera, Ormosia henryi, Madhuca pasquieri and Oryza rufipogon) under second class state protection, and five species(Nageia fleuryi, Michelia gioii, Carallia diphopetala, Ixonanthes reticulate and Antiaris toxicaria) under third class state protection. In addition, according to the IUCN's Evaluation standards of endangered species, vascular plant which didn't record in rare and endangered plants were assessed in Guangxi Beibu Golf Coastal Zone.26species are suggested to be listed in the list of wild plant protection, which belongs to25genera and23families.