| In this paper,we take the forest plants in Diebu county as the research object,using the method of combining the sample line survey and the sample Land survey to make a detailed investigation and Analysis on the forest plants and Plant communitys,and draw the following conclusions:1)According to the survey,there are 1,785 species and 577 genera of 133 families in the forest plant resources of Diebu County,accounting for 44.19%,16.93%,and 5.73% of the total number of high-level wild plant resources,total genera,and total species.2)As one of the most important results of this survey,3 newly recorded genera of Gansu province were found in Diebu County,and 51 new records species of Gansu province were found,belonging to 19 families and 35 genera.In addition,24 species of rare and endangered plants were found,including 3 species of the grade I protected plants,12 species of the grade II protected plants,9 species of wild plants protected by the grade III,and 15 endemic species.3)Among the forest plants in Diebu County,there are 423 species of woody plants,accounting for 23.69% of the total species of forest plants in Diebu County,and their resources are in the middle.These include 156 species of trees,265 species of shrubs,and only 2 species of bamboo,belonging to 1 family and 1 genus.There are 1260 species of herbaceous plants,accounting for 70.59% of the total species of forest plants in Diebu County,with the largest amount of resources.There are 28 species of vines,accounting for 1.57% of the total species,and they contain the least amount of resources.Among the taxa,there are 15 families,28 genera,and 74 species of ferns.There are 37 families,13 genera and 5 species of gymnosperms.There are 102 families,443 genera,and 1460 species of dicotyledons in total angiosperms.There are 11 families,93 genera and 214 species in total.4)There are 19 families in the dominant families with 20 or more species in the family,and the most species is in the Asteraceae,followed by the Rosaceae.There are 8 families within 40-60 species.There are 8 families in the dominant family of 20-40 species.The genus contains more than 15 species,and the total dominant genera are 16 genera,accounting for 2.77% of the total number of genera.5)The 133 families of forest plants in Diebu County were divided into 11 geographical distribution types.The world has a total of 39 families,accounting for the largest proportion.The 577 genera of forest plants in this area can be divided into 15 distribution types.There are 140 genera of tropical genus,accounting for 24.26% of the total number of the genus,indicating that the plant in the area has certain origins with tropical and subtropical plants.This shows that the tropical component does not play a major role in the forest flora and community composition in Diebu County.There are 409 genera in the above temperate patterns,accounting for 70.88% of the total number of genera.The nature of the temperate zones is obvious.Obviously,it is dominant in the forest flora and plant community composition in Diebu County.Judging from the analysis of the forest flora in Diebu County,there are three main characteristics: the composition of the flora is complex and the transition is obvious;the temperate flora type dominates,especially the composition of the north temperate zone;the origin of the forest vegetation is ancient.6)The study found that the forest vegetation in Diebu County can be divided into 9 vegetation types,11 formation groups and 49 formations.7)There are 55 kinds of forest plants in Diebu County,and there are 96 kinds of easily-disappeared species.There are 150 kinds of possible disappearing species.There are more safe species,and there are 1484 species in total,accounting for 83.14% of the total species.There are 72 species of the grade I protected plants assessed;245 species of forest plants are protected by the grade II protected plants in Diebu County;the most commonly protected plants are 1,468 species,accounting for 82.24% of the total plant species. |
PDF Full Text Request