Information System Of The Rare And Endangered Plants In Guizhou Province

In the present paper, on the basis of field survey on nature reserve, specimen survey and search for data about the rare and endangered plants from all kinds of Flora, the status, numbers and distributions of the rare and endangered plants in Guizhou is clearly presented. At the same time, the author has particularly analysed the flora and geographic distribution of the rare and endangered plants in Guizhou and showed the protection status and countermeasures for them.The information about family names, genus names, specie names, morphological characters, ecology traits, protection value, geographic distribution, live and specimen photoes etc., are input into computer. The primary information system of the rare and endangered plants in Guizhou is set up with the database based on SQL and the searching and administering webs edited by ASP. The system comprises one database and has the functions of searching and administration. It is composed of seven parts including " information searching system", "administration system", "protection status", "floristic analysis", "research object", "about us "and "related links".The system comprises these conclusions as follows: 1. The flora analysis of the rare and endangered plants in Guizhou.(1) Based on Red List of Plants in China and List of National Protected Wild Plants, there are totally 100 rare and endangered plants in Guizhou, which belong to 79 genera of 48 families. Among them, 10 species of 7 genera in 7 families are pteridophyta, 20 species of 14 genera in 6 families are gymnosperm, and 70 species of 58 genera in 35 families are angiosperm.(2) The rare and endangered plants show features of ancient origin and very complex in floristic elements. There are primitive angiosperms as magnoliaceae and hamamelidaceae in Guizhou province. On the level of genus, the flora of rare and endangered plants fall into 12 areal-types and 7 areal-subtypes, which shows their complex in floristic elements.(3) China-endemic species of rare and endangered plants in Guozhou are abundant. In additon, there are 3 endemic species to Guizhou province, i.e., Abies fanjingshanensis, Thamnocharis esqitirolii and Cycas gitizhonensis.(4) The Tropical elements account for a great proportion, so the flora shows a tropical floristic feature. In the light of areal-types of families, there are 27 Tropic families, which account for 64.29% of overall families. On the level of genus, there are 33 Tropic genuses, which account for 42.30% of overall genus.(5) Most of the rare and endangered plants in Guizhou are trees, among which tall trees account for a huge proportion.(6) The flora of the rare and endangered plants in Guizhou has the closest relationship with that of Southwest of China, especially with Yunnan. The two provinces share 60 species in common, 60.0% of overall species.(7) The vertical distributions of the rare and endangered plants in Guizhou shows certain variations. Many of them distribute between 500-2 000 m in alt.. For example, Tsoongiodendron odorum distributes between 280-640 m, and Abies fanjingshanensis distributes over 2 100 m.(8) Among 9 cities of Guizhou province, Qiannan has the largest number of species of rare and endangered plants, and Anshun has the smallest. As a whole, the South of Guizhou is the region where species of rare and endangered plants are the most abundant, the North of Guizhou is second, and the middle part is the least.2. Protection status and countermeasures of rare and endangered plants in Guizhou province.(1) Because of social and economic development, plant resources in Guizhou were unreasonably exploited, some rare and endangered plant resources were destroyed, the distribution of many rare and endangered plants are shrinking, and their population numbers are reducing. On the basis of reasons for the extinction and the current protection status, the author put forward some protection countermeasures.(2) At present, there are 68 nature reserves in Guizhou, but the area percentage of the Nat...