Study On Vascular Plant Flora Of Luo Shan National Nature Reserve In Ning Xia

Luo shan is located in the arid zone of central Ningxia,on the ecological transition zone between grassland and desert.Its unique geographical position and topography give birth to diverse habitats and high special species diversity.By collecting a large number of specimens,sorting out,identifying,and collecting relevant data in Luo shan area,on the basis of previous studies,we have more comprehensive statistics and analysis of the Luo shan vascular flora.The analysis includes species composition,geographic composition,species life forms,water ecological types and protected species,and on this basis,the relationship between Luo shan and its neighboring flora was further compared and analyzed.The following conclusions are drawn:(1)There are 73 families,244 genera,and 506 species of vascular plants in Luo shan Mountain of Ningxia(The subspecies grades is not included,but if Luo shan only distributes a certain kind of planting unit,then the planting unit is conted as a species statistics),among them,stone pine and pteridophytes are counted according to PPG ? system,Luo shan no lycopsida are distributed,there are 4 families,5genera,and 6 species of ferns,Gymnosperms are counted according to the Christenhusz system.Gymnosperms include 3 families,5 genera,and 8 species.Angiosperms include 66 families,234 genera,and 492 species and its were arranged according to APG ? system,The dominant families of Luo shan are: Asteraceae,Poaceae,Fabaceae,Rosaceae,and the dominant genera of Luo shan are Artemisia,Astragalus,and Oxytropis.In this investigation and research in Luo shan,we found 1new record family of Ningxia,1 new record genus of Ningxia,16 new record species of Ningxia,102 new record species of Luo shan;(2)Luo shan vascular plant life forms mainly are perennial herbs.,followed by one-year and two-year-old herbs;(3)For water ecological types,mesophytes are dominant,followed by xerophytes;(4)Temperate components are dominant in flora components,and Mongolian ingredients have a greater impact on the formation of Luo shan District,followed by the North China component.In addition,the Qinghai-Tibet Plateau component and the Paleo-Mediterranean component also have a certain influence on the Luo shan area.(5)There are13 national-level protected plants;(6)In the comparative study of the floristic similarity with Helan Mountain,Liupan Mountain,Qilian Mountain,Ordos Plateau and Northern Shaanxi Loess Plateau,it is found that the most similar to Luo shan District is Helan Mountain,and the lowest similarity with Luo shan District is the Loess Plateau in northern Shaanxi.It shows that the flora of Luo shan is closer to the southern Mongolian plateau,and is consistent with the Helan Mountain in terms of floristic division.It should be part of the Mongolian Plateau.