Investigation and Analysis of Eucalyptus Sprouting Forest in Cutting Area of Nanning Arboretum
The survey data of Eucalyptus sprouting forest in Nanning Arboretum cutting area from 2021 to 2023 were analyzed by variance analysis and cluster analysis to provide reference for the management of Eucalyptus sprouting forest.The results showed significant differences in timber yield per unit area,tree density,and timber yield per tree among different locations within the same age group.In age group I(4 years≤stand age<6 years),had the highest timber yield per unit area(179.25 m3·hm‒2).In age group II(6 years≤stand age<8 years),Cangwu County(183.00 m3·hm‒2)and Long'an County(187.95 m3·hm‒2)had the higher timber yield per unit area.In age group III(8 years≤stand age<10 years),Hengzhou City had the highest timber yield per unit area(242.05 m3·hm‒2).Timber yield per unit area and timber yield per tree increased with age group,with age groups II and III showing significantly higher timber yields per unit area and per tree compared to age group I.The average annual timber yield per unit area decreased with age group,and there were significant differences among all age groups.However,there were no significant differences in tree density per unit area across the age groups.Overall,the timber yield per unit area in Nanning Arboretum is relatively low,and it is necessary to formulate reasonable management measures according to site conditions and strengthen management to increase yield.The suitable density of sprouting forest was 1 200～1 600 plants·hm‒2,and the suitable cutting age was 6～8 years.
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