Natural Regeneration Characteristics and Spatial Distribution Pattern of Subtropical Evergreen Temperate Broad-leaved Mixed Forest Seedling
To explore the characteristics of the natural regeneration of subtropical evergreen broad-leaved mixed forest and the spatial distribution patterns of the population in the seedling stage,Liuxihe National Forestry Park was taken as the research object.Based on the survey data of natural regeneration seedlings in 10 plots,the seedlings were divided into three regeneration levels according to the technical regulations of the National Forest Resources Continuous Inventory,the seedlings were divided into three regeneration grades:Grade I,plant height<0.3 m;Grade II,0.3 m≤plant height<0.5 m;Grade III,plant height≥0.5 m and DBH<1.0 cm.To study the natural regeneration characteristics of broad-leaved mixed forest seedlings,and seven aggregation indi-ces were used to determine the spatial distribution patterns of seedlings.The results showed that there were 58 species of natural regeneration seedlings belonging to 39 genera and 26 families in the broad-leaved mixed for-est.The top three species were Castanopsis faberi,Machilus nanmu,and Schima superba.The regeneration seedling density of the broad-leaved mixed forest and the main tree species decreased with the increase of natural regeneration quality grade.The regeneration quality of all seedlings was poor.The spatial distribution pattern of seedlings of all tree species showed aggregation distribution,and the aggregation intensity of seedlings of differ-ent tree species was different.Among them,the Litsea rotundifolia var.oblongifolia was the strongest,and that of Litsea pseudoelongata was the weakest.The spatial pattern of regeneration seedlings of the main tree species in the evergreen and deciduous broad-leaved mixed forest in Liuxihe National Forest Park showed an aggregated distribution.In this survey,the Castanopsis faberi seedlings were more suitable to grow in the understory envi-ronment with high canopy density.The large canopy density of broad-leaved mixed forest and understory shrubs limited the regeneration of the understory seedlings.
seedlingnatural regenerationspatial distribution patternthe mixed broad-leaved forest
NETL
NSTL
万方数据
