Floristic Analysis And Conservation Of Vascular Plants In Bila River Area,Inner Mongolia

In this study,714 species in 368 genera and 100 families and subspecies of vascular plants(19 species in 14 genera and 11 families of pteridophytes,695 species in 354 genera and 89 families of seed plants)were analyzed by means of phytogeography,and the diversity,floristic composition and survival status of rare and endangered wild plants in the region were fully mastered.Among the 100 families of vascular plants in Bila River area,only Compositae had more than 50 species.There are 9 families with 21 ? 50 species,and in order of the number of species contained,they are Rosaceae,Ranunculaceae,Gramineae,Leguminosae,Cyperaceae,Liliaceae,Labiatae,Polygonaceae and Umbelliferae.The above 10 families with more than 20 species contain 370 species in 179 genera.They accounted for 48.64% and 51.82% of the genera and species of vascular plants,respectively,while the number of families only accounted for 10% of the total number of families.In addition,there were 90 species in 59 families containing 1 to 3 species of plants,accounting for 59% and 12.61% of the total number of families and plant species,respectively.There were 54 families containing only one genus(including single genus family and multiple genus family containing only one genus in this region),accounting for 53.54% of the total number of families in this region,and 234 genera containing only one genus and oligospecies,accounting for 63.59% of the total number of genera.The number and proportion of singular families,multiple genera,monospecies and oligospecies in the region were large.In general,the plant species in this region are relatively rich but the degree of differentiation is low.The region as the Daxinganling Mountains in eastern part of the plant endemism is not obvious,geography relations,it is closely related to the Siberian Region and the Dahurica Region of Russia and Japan and the Mongolian Grassland Region,this similar to floristic nature of the Xiaoxinganling Mountains,but on the composition of Siberia and Mongolia grassland proportion increased,it can be seen that the region is in the Daxinganling Mountains and Mongolia grassland transition area,it has to do with the region's geographical regionalization of vegetation.After investigation and analysis,actual vegetation links Nuo Min river farms and Da'er Gou forest farm two coordinate points,draw a can roughly reflect the regional vegetation regionalization bi river line-"The dividing line of cool coniferous forest,temperate grassland zone boundaries",actually has a certain width and not for the straight line,for clear and concise report the situation to them and song to straight,belt line,on the part of the vegetation regionalization for cool coniferous forest region,is characterized by relatively high above sea level,the temperature is relatively low.The vegetation types in the upper part showed the characteristics of cold temperate coniferous forest,with high altitude and relatively low temperature,.Larix gmelinii(Rupr.)Kuzeneva,Ledum palustre L.were the typical plants.The lower part shows temperate steppe type with low altitude,warm,representing plants such as Filifolium sibiricum(L.)Kitam.and Stellera chamaejasme L.,et.The flora of this region belongs to Pan-arctic East Asia region in the world floristic division,and belongs to Pan-arctic Daxinganling region in China floristic division,showing the characteristics of transition to Northeast China and Inner Mongolia steppe region.According to species regionalization classification system of plant,the vascular plants in this region can be divided into 21 distribution types and 22 subtypes.The distribution types are mainly temperate species,accounting for 74.86%.There are 153 subfriggia-friggia-characteristics,accounting for22.27%.There are 20 tropical properties,accounting for 2.92%.Among the temperate species,88 species are distributed from China to Japan,accounting for 17.12% of the temperate species.86 species are distributed in temperate Asia,accounting for 16.73% of the temperate species.72 species are distributed in the north temperate zone,accounting for 14.01% of the total temperate species.There are 72 temperate species distributed in the Old World,accounting for 14.01% of the temperate species,and 318 species of the four types,accounting for 61.87%of the temperate species and 44.54% of the total species of vascular plants in this region.It can be seen that these four types play an important role in the flora of vascular plants in this region.On the basis of reference the IUCN red list type and standard(version 3.1)",according to the list of rare and endangered plants in China "(1987)," the national key protected wild plants list(the first)"(1999)," the national key protected wild plants list(the second)discussion " and "the list of rare and endangered plants in Inner Mongolia "(1989),In accordance with the important plants of special economic value or important scientific research significance;A plant with a severely depleted population;In this region,the plants growing in special environment and the native environment has been seriously damaged,the population number is obviously reduced,and there are endangered or extinct plants in this region;The principle of transitional plants of more than two regions is shown in the vegetation regionalization of China or in the Daxinganling Mountains and the Xiaoxinganling Mountains,determines the 40 species of vascular plants in urgent need of protection.For 40 species of vascular plants in urgent need of protection,using the disappearing risk index and genetic damage index,for a total of 9 indicators assignment,formulated the sequence of priority conservation of rare and endangered plants in this region,and puts forward the protective measures and Suggestions,this region of bi river of rare and endangered plants provide a scientific basis for scientific management of wild plant utilizationin the Bila River area.