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常绿落叶阔叶混交林是我国北亚热带的地带性植被类型,在神农架山地其优势类型为水青冈-青冈混交林。本研究基于对120m×80m的永久样地的2001、2006、2010年3次调查数据,从物种组成、数量特征、群落结构等方面分析了神农架山地米心水青冈-多脉青冈(Fagus engleriana-Cyclobalanopsis multiervis)混交林群落的动态特征。结果表明:群落的物种组成变化不大,在2001年、2006年和2010年分别为81、84和83种;优势成分以多脉青冈、米心水青冈、粉白杜鹃(Rhododendron hypoglaucum)和灰柯(Lithocarpus henryi)为主,但常绿树种重要值有增加的趋势;树木生长速率有加快的趋势;常绿树种的动态性强于落叶树种。树木数量、胸高断面积均呈现出先增加后减少的趋势;群落的整体结构未发生较大的变化,死亡个体的结构变化较为明显。从群落9年内的物种组成和结构变化来看,虽然在两次调查间隔期间树木的死亡和增补格局发生变化,雪灾对该群落可能产生了一定的影响,但该群落的物种组成和结构总体格局未发生较大变化,处于一种动态平衡,对外界干扰有较强的抵抗力。
The evergreen and deciduous broad-leaved mixed forest is a type of zonal vegetation in the northern subtropics of China. The dominant type in the Shennongjia mountainous area is Mizo-Cyclobalanopsis glauca forest. Based on the survey data of 2001, 2006 and 2010 of 120m × 80m permanent plots, the author analyzed the Fagus engleriana- Cyclobalanopsis multiervis) community dynamics. The results showed that there was no significant change in the species composition of the community, with 81, 84 and 83 species in 2001, 2006 and 2010, respectively. The dominant species were Pinus kumiensis, Rhododendron xylostella, Rhododendron hypoglaucum, (Lithocarpus henryi), but the important value of evergreen species tends to increase; the growth rate of trees tends to accelerate; the dynamics of evergreen species is stronger than that of deciduous species. The number of trees and the area of chest height and height all showed the tendency of first increasing and then decreasing; the overall structure of the community did not change much, and the structure of death individuals was more obvious. In terms of changes in species composition and structure within 9 years of the community, although the death and pattern of tree changes during the two survey intervals may have some impact on the community, the overall composition and structure of the community No major changes occurred, in a dynamic balance, the external interference has a strong resistance.