不同恢复群落的山地常绿落叶阔叶混交林优势种及主要伴生种种群结构与动态

The Structure and Dynamics of Dominant and Associated Populationsin Mixed Evergreen and Deciduous Broad Leaved Forest in Mountainous Region of Different Recovery Communities

山地常绿落叶阔叶混交林是我国特有的自然植被类型和天然林类型,为研究山地常绿落叶阔叶混交林优势种及主要伴生种群结构和动态,揭示其生物多样性形成及维持机制,作者依托湖北恩施森林生态系统国家定位观测研究站的建设,对木林子自然保护区不同恢复群落的山地常绿落叶阔叶混交林开展了植物群落调查,从物种组成、径级结构和垂直结构等方面分析了优势种及主要伴生种群的群落特征.结果表明:3个恢复群落中,DBH≥1 cm的木本植株分别有148种6 970株、176种4533株和149种4048株,隶属于14科23属、19科26属和16科25属;从整体上看,3个恢复群落优势种及主要伴生种的物种丰富度随垂直层自上而下呈现"单峰型",个体多度随垂直层降低而增加,平均树高分别为5.94、5.21和4.61m;群落物种丰富度整体上均随径级增大而下降,个体多度均呈倒"J"型分布,小径级个体数量多,平均胸径分别为4.18、4.35和4.48 cm.总之,木林子自然保护区不同恢复群落的山地常绿落叶阔叶混交林群落物种组成丰富,多数种群自然更新良好,群落整体上正处于演替进程中.

Mixed evergreen and deciduous broad-leaved forest is a typical natural vegetation type and natural forest type in China. In order to study the dominant and associated population structure and its dy-namicst and reveal the mechanism of the formation and maintenance of biodiversity,we rely on the con-struction of National Forest Ecosystem Research Station of Hubei Enshi, to investigate the plant communi-ty of mixed evergreen and deciduous broad-leaved forest in different stages of natural recovery in Mulinzi Nature Reserve, and we analyzed the community characteristics of dominant and associated populations from the aspects of species composition, the areal-types, the diameter class structure and the vertical structure. The results show that： Among the dominant and associatedpopulations in different recovery communities, the species number of woody plants at breast height （ DBH）≥1 cm is 148,176,149 and the plant number is 6 970,4 533,4 048.They belong to 23 genera of 14 families,26 genera of 19 families and 25 genera of 16 families.Overall, the species richness of the dominant species showed the″unimodal type″with the vertical layer drops in the 3 stages of natural recovery,the individual abundance increases with the decrease of the vertical layer.The average tree height is 5.94,5.21 and 4.61 m respectively. The spe-cies richness of different recovery communities decreases with the increase of the diameter class in differ-ent recovery communities,individual multi degree is inverted ″J″ type distribution. The number of small diameter class is large,the average tree DBH is 4.18,4.35 and 4.48 cm respectively. In short, the species＆amp;nbsp;composition of the forest communities is rich in the mixed evergreen and deciduous broad-leaved forest in different stages of natural recovery in Mulinzi Nature Reserve. Most of the population naturally updates well and the whole community is in a positive succession.