Species composition and community structure of broad-leaved ever-green forests of Cyclobalanopsis myrsinifolia Blume+Cyclobalanopsis oxyodon Miq.on the southern slopes of Shennongjia
This study established a 1-hm2 fixed plot for dynamic monitoring of broad-leaved evergreen forest on the southern slopes of Shennongjia to examine the species composition,floristic characteristics,vertical structure,diameter class structure,and spatial distribution pattern of this community.Results revealed high species richness,with a total of 216 vascular plant species identified,belonging to 78 families and 154 genera.Of these,107 species were woody plants with a diameter at breast height(DBH)≥1 cm,distributed across 38 families and 69 genera.In terms of floristic composition,families and genera with tropical distribution accoun-ted for 50.00％and 40.58％of the total,respectively,while those with temperate distribution accounted for 34.21％and 53.63％,respectively.Evergreen tree species accounted for 55.14％(59 species),while deci-duous tree species accounted for 44.86％(48 species),with the dominance,basal area,and importance values of evergreen tree species being 82.23％,64.79％,and 73.03％,respectively.Occasional species ac-counted for 33.64％(36 species)and rare species accounted for 8.41％(nine species).The vertical structure of the community was well-defined,with distinct tree,shrub,and herb layers,each exhibiting high species rich-ness.The diameter class structure exhibited a reverse"J"shape,indicative of a growth-type community.Spa-tially,dominant species showed varying degrees of clustered distribution.This study indicated that the impor-tance value of evergreen tree species in the community was significantly higher than that of deciduous tree species,belonging to the Cyclobalanopsis myrsinifolia Blume+Cyclobalanopsis oxyodon Miq.community,rep-resenting a typical evergreen broad-leaved forest in the region.The floristic composition reflects the cha-racteristics of Shennongjia as the boundary between the subtropical and north subtropical zones.The commu-nity demonstrates robust regenerative capability,indicating a successional trajectory toward climax evergreen broad-leaved forests.
Forest dynamic monitoring plotNorthern boundary of the central Asian subtropicsFloristic analysisSize class structurePoint pattern analysis
万方数据
维普
