青冈栎次生林种群结构及动态特征

摘要

青冈栎作为我国南方亚热带地区主要建群树种之一,对南方生态系统的稳定起着至关重要的作用.通过样地调查和数据统计方法,分析其种群年龄结构特征,编制其种群的静态生命表,对死亡率、存活、消失率曲线进行分析,并通过时间序列预测、种群数量化动态方法的运用,揭示天然次生林中青冈栎种群结构及动态特征.结果表明:青冈栎种群属于增长型,种群的动态变化指数值为0.0103,表明该种群趋于稳定型;存活曲线趋于Deevey-Ⅱ型,各龄级种群有着相近的死亡率;时间序列预测分析表明,在未来10、20、30、40 a后青冈栎种群老龄个体逐渐增多,幼龄株数逐渐减少,维持种群长期稳定性困难,因此,采取适当的人工措施是保持青冈栎种群天然更新和种群稳定的关键.%Cyclobalanopsis glauca,one of the main species of the subtropical region in southern China,plays a vital role in the stability of the southern ecosystem.Through the method of sample survey and data statistics,the age structure of the population was analyzed,and the static life table of the population was compiled.The mortality,survival and disappearance rate curves were analyzed.By means of time series prediction and population quantitative dynamic method,The population structure and dynamic characteristics of Cyclobalanopsis glauca in natural secondary forest were revealed.The results showed that the dynamic change index of Cyclobalanopsis glauca was 0.010 3,indicating that the population was stable.The survival curve was similar to Deevey-Ⅱ,and the mortality of each age group had similar mortality.Time series prediction The results showed that the number of young plants decreased gradually and the long-term stability of the population was stable.Therefore,the appropriate artificial measures were to keep the natural regeneration and population stability of Cyclobalanopsis glauca population in the future.