Studies On Distribution Characteristic And Protection Of National Key Protected Wild Plants Of Xuancheng In Anhui Province

Based on the investigation of national key protected wild plant resources in Xuancheng,this paper discussed the location,population size,vegetation types,growing trends,distribution characteristics and conservation status of these plants.Meanwhile,we studied on their analytical endangerment factors and put forward some protection countermeasures.This research aimed to provide some basis for local government to protect the national key protected wild plants.The main findings of this study were as followings:1.Xuancheng has 17 species of national key protected wild plants,belonging to 12 families and 16 generas.Among them,there were 3 first-grade national protected plants,including Taxus chinensis,Taxus chinensis var.mairei,Parrotia subaequalis,and 14 second-grade national protected plants,namely Pseudolarix amabilis,Torreya grandis,Zelkova schneideriana,Magnolia officinalis ssp.Biloba,Emmenopterys henryi,Toona ciliata var.Pubescens,Phoebe chekiangensis,Calycanthus chinensis,Heptacodium miconioides,Pseudotsuga gaussenii,Kirengeshoma palmata,Cercidiphyllum japonicum,Liriodendron chinense,Ulmus elongata.2.Study on the life form of the 17 kinds of national key protected wild plants showed that there were 16 woody plants and 1 herbs plant.The 16 kinds woody plants can be divided to 14 arbors and 2 shrubs.There were 5 kinds of evergreen trees and 9 kinds of deciduous trees.3.For the seed plant distribution in genera,national key protected plants in Xuancheng showed some features that the origin of them was ancient and rare species were rich.East Asia and North America disjunctd type(4 family 5 genera)and Chinese endemic(4 family 4 genera)were the dominant flora types.It reflected that the flora of national key protected plants has strong temperate characteristics,and many of them only distributed in China.4.The vegetation of the national key protected wild plants in Xuancheng can be classified into 3 vegetation type and 7 vegetation subtypes,in which subtropical evergreen broadleaf deciduous mixed forest and bamboo forest were the main types,and bamboo forest occupied a large proportion.5.The geographic distribution of the key protected plants was uneven,the descending order was Jixi> Ningguo> Xuanzhou> Jing County,Jingde>langxi,Guangde.In terms of the individual protected wild plant,Torreya grandis has the highest frequency of occurrence,it distributed in all counties.On the contrast,The frequency of occurrence of Taxus chinensis,Toona ciliata var.Pubescens,Calycanthus chinensis,Heptacodium miconioides,Pseudotsuga gaussenii,Kirengeshoma palmata,Cercidiphyllum japonicum,Liriodendron chinense,Ulmus elongata were very low,which only found in a specific region.Torreya grandis,Taxus chinensis var.Mairei,Pseudolarix amabilis and Zelkova schneideriana are widely distributed species type,while Magnolia officinalis ssp.biloba,Emmenopterys henryi,Phoebe chekiangensis,Calycanthus chinensis,Heptacodium miconioides,Parrotia subaequalis,Taxus chinensis,Pseudotsuga gaussenii,Kirengeshoma palmata,Cercidiphyllum japonicum,Liriodendron chinense,Ulmus elongata belonged to narrow field-type distribution of species.6.The study of vertical distribution showed that protected plants distributed from low to high elevations areas,especially within the range of 200-1000 m.Fewer species distributed below 200 m and above 1000 m.And rich biodiversity areas often have more key protected plant species,which showed a positive correlation between them.7.There were four kinds of distributed patterns of these protected plants.First,there were 7 species single or sporadic distribution,namely Taxus chinensis,Parrotia subaequalis,Toona ciliata var.pubescens,Heptacodium miconioides,Pseudotsuga gaussenii,Cercidiphyllum japonicum,and Ulmus elongata.Secondly,there were 3 species aggregated distribution,namely Calycanthus chinensis,Kirengeshoma palmata,Liriodendron chinense.Thirdly,there were 5 species were single or sporadic distribution mainly,namely Pseudolarix amabilis,Taxus chinensis var.mairei,Magnolia officinalis ssp.biloba,Phoebe chekiangensis,Emmenopterys henryi.And last,there were 2 species planar distribution mainly,namely Zelkova schneideriana,Torreya grandis.8.National key protected wild plants were well protected in Banqiao Provincial Nature Reserve and Jixi Qing Liangfeng National Nature Reserve.The other places were subject to a certain degree of human disturbance,which should be paid more attention.