Priority Quantitative And Population Structure Research On Rare And Endangered Plants In Wuyuan National Nature Reserve For Forest Birds,Jiangxi Province

Wuyuan forest bird National Nature Reserve in Jiangxi Province is one of the key areas of biodiversity in Jiangxi Province.This study took the rare and endangered plants in the reserve as the research object,through line survey and typical sample methods,and analyzed their floristic characteristics,population structure,dynamic characteristics and priority protection level.It is expected to provide basic data and scientific basis for the biodiversity protection and the protection management of rare and endangered plant resources in Wuyuan forest bird National Nature Reserve in Jiangxi Province.The main conclusions are as follows:(1)Rich species of rare and endangered plantsThe rare and endangered plant resources in the reserve are 96 species,73 genera,35 families,accounting for 14.4%,5.76% and 2.14% of the plant resources in Jiangxi Province,respectively.Among them,Bryophytes are 1 family,1 genus and 1 species.Lycophytes,1 family,1 genus,1 species;Gymnosperms,3 species,3 genera,2 families;32species of Monocotyledons,24 genera,3 families and 58 species of Dicotyledons,44 genera,28 families.There are 34 species of national key protected wild plants,54 species of jiangxi provincial key protected wild plants,47 species of IUCN List of Red Plants and China List of Red Species(including some national and provincial key protected wild plants).(2)The flora of rare and endangered plants is rich in composition and ancient originIn this reserve,19 families are single species,accounting for 54% of the total number of families.There are 57 monotypic genera,accounting for 78.08% of the total genera.The proportion and number of single-species family and single-species genus have obvious numerical superiority,so rare and endangered plant species are abundant.There were 7 areal types and 4 variations in the floristic composition of families,12 areal types and 5 variations in the floristic composition of genera,indicating the diversity and complexity of the floristic components in this study.There are many ancient and primitive species in this reserve,such as Gymnosperms:Taxus chinensis var.Mairei,Torreya grandis.Ancient species of Liriodendron chinense,Ulmus elongata,Emmenopterys henryi,Cyclocarya paliurus etc.(3)Species with high priority conservation value need to be protected firstAmong rare and endangered plants,there are 14 species with priority protection value I,accounting for 14.8% of the total,and they are urgently in need of protection;15 species of level II,accounting for 15.8% of the total,are Species that need to be protected;there are 58 species in level III,accounting for 61% of the total,which are generally protected species;there are 8 species in level IV,accounting for 8.4% of the total,which are relatively safe species.(3)There are differences between existing population structure and dynamic prediction trendIn this reserve,the population structure of the growing species are Acer sinopurpurascens,Tapiscia sinensis,Lagerstroemia caudata,Phoebe chekiangensis,Ormosia henryi,Magnolia cylindrica,Emmenopterys henryi.The population structure of the stable type: Magnolia sieboldii,Phoebe bournei,Chimonanthus salicifolius,Toona ciliata var.pubescens,Acer wuyuanense,Liriodendron chinense.After fitting and verification of the above population survival curves,the populations with Deevey-Ⅱ type are Magnolia sieboldii,Phoebe bournei,Chimonanthus salicifolius,Toona ciliata var.pubescens,Acer wuyuanense,Liriodendron chinense.The species of Deevey-III type are:Magnolia sieboldii,Chimonanthus salicifolius,Toona ciliata var.pubescens,Ormosia henryi,Acer wuyuanense,Liriodendron chinense.The future development trend of the population was different from that of the present population.The future development trend of the population is the growth type: Acer sinopurpurascens,Tapiscia sinensis,Magnolia sieboldii,Lagerstroemia caudata,Phoebe chekiangensis,Phoebe bournei,Chimonanthus salicifolius,Ormosia henryi,Magnolia cylindrica,Emmenopterys henryi.The future development trend of Acer wuyuanense is stable.The future development trend of the population is decline type: Toona ciliata var.pubescens,Liriodendron chinense.