Species composition and geographical distribution characteristics of national key protected wild plants distributed in Xizang Autonomous Region
Based on The List of National Key Protected Wild Plants announced in 2021 and combined with field surveys and relevant data records,the species composition,life forms,endangered status,geographical elements,and horizontal and vertical distribution patterns of national key protected wild plants distributed in Xizang Autonomous Region(hereinafter referred to as Xizang)were studied.The results show that there are a total of 217 species(including infraspecies,the same below)of national key protected wild plants distributed in Xizang,belonging to 87 genera of 54 families,among which,there are 10 species of national first-class key protected wild plants,and 207 species of national second-class key protected wild plants.In terms of species composition,at the family level,the Orchidaceae has the most species,containing 100 species of 14 genera;at the genus level,Dendrobium Sw.,Cymbidium Sw.,and Cypripedium Linn.are dominant,containing 38,24,and 14 species respectively.In terms of life forms,perennial herbs are absolutely dominate(162 species)among the national key protected wild plants distributed in Xizang,accounting for 75.3％.In terms of endangered status,among the national key protected wild plants distributed in Xizang,there are 11 critically endangered(CR)species,59 endangered(EN)species,and 77 vulnerable(VU)species,and the proportion of threatened species is as high as 67.7％.In terms of geographical elements,the national key protected wild plants distributed in Xizang have 6 areal-types and 6 subtypes at the family level,and the ratio of tropical families to temperate families is 1.54;there are 10 areal-types and 15 subtypes at the genus level,and the ratio of tropical genera to temperate genera is 0.87;there are 52 endemic species in China and 6 endemic species in Xizang at the species level.In terms of horizontal distribution patterns,the national key protected wild plants distributed in Xizang are mainly concentrated in the southeast and south of Xizang,and from the level of county-level administrative regions,Medog County has the most species of national key protected wild plants(129 species);in terms of vertical distribution patterns,the species number of national key protected wild plants in Xizang shows a tendency to first rapidly increase and then gradually decrease with the increase of altitude,among which,species distributed within the altitude(Alt)range of 800 m＜Alt ≤ 1 200 m are the most(100 species).Currently,the national key protected wild plants distributed in Xizang are facing multiple survival pressures,including over-harvesting,population decline,and global climate change.It is recommended to conduct a comprehensive survey of national key protected wild plant resources in Xizang,carry out targeted protection for endangered species,establish a system of natural reserves,and intensify protection publicity,thereby providing a scientific basis for in-situ and ex-situ conservation.
万方数据
维普
