Dynamic characteristics of evergreen broad-leaved forest flora in Jiulian mountain as well as its response to snow disaster
[Objective]This study aimed to explore the characteristics of the flora of vegetation in Jiulian Mountain as well as the effects of the 2008 snow disaster on the flora characteristics of vegetation in Jiulian Mountain.[Method]The differences in the characteristics of the flora at the spatial scale was explored based on investigation data of the 6 hm2 plot in Jiulian Mountain,the 20 hm2 plot in Chebaling Mountain,the 20 hm2 plot in Dinghu Mountain,the 24 hm2 plot in Gutian Mountain and the 20 hm2 plot in Tiantong.The temporal dynamic impact of the snow disaster on vegetation flora was examined based on the 4 hm2 plot of Jiulian Mountain established during the 2008 major snow disaster and the re-survey data in 2022.[Result]In the 6 hm2 plot of Jiulian Mountain,there were 25 061 woody plants belonging to 213 species,92 genera,and 50 families.The tropical and temperate distribution types of families accounted for 52%and 22%,respectively,of the total number of families,while the genera of the tropical and temperate distribution types made up 68%and 30%of the total genera.The species similarity coefficients between the 6 hm2 plot in Jiulian Mountain and the other plots were all less than 50%.The 6 hm2 plot of Jiulian Mountain had the smallest area and the highest species number,compared to that of the other plots.Compared to the 4 hm2 plot of Jiulian Mountain in 2008,49 species,12 families,and 23 genera disappeared,while,1 family,7 genera,and 29 species were added in the 4 hm2 plot in 2022,although there was a very high similarity coefficient between them.[Conclusion]The vegetation of Jiulian Mountain is located in the transitional zone between the south subtropical and middle subtropical vegetation,leaning towards the middle subtropical region.It is an area with rich species diversity,specificity,and a high degree of species differentiation.The major snow disaster in 2008 caused some disturbance to the evergreen broad-leaved forest of Jiulian Mountain,which has not been fully restored for 14 years.
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