白桦天然次生林种群生态特征的研究  

Study on Population Characteristic of Betula Platyphylla Natural Secondary Forest

作　　者：卫晶[1] 赵惠玲[1] 毕润成[1] 苗艳明[1] 

机构地区：[1]山西师范大学生命科学学院,山西临汾041004

出　　处：《山西师范大学学报（自然科学版）》2012年第4期56-61,共6页Journal of Shanxi Normal University(Natural Science Edition)

基　　金：山西省留学基金项目(20081073)资助

摘　　要：采用样地调查的方法,对太岳山七里峪白桦林种群进行了年龄结构分析、编制了静态生命表、绘制了存活曲线,并对该种群的四个函数(生存函数、积累死亡函数、死亡密度函数、危险率函数)进行数量分析,结果表明:①七里峪白桦种群龄级分布,不同环境下种群结构稍有差异:种群A、种群D为增长型种群,种群B、种群C、种群E趋向于稳定型.②白桦种群存活曲线接近于DeeveyⅡ型.③积累死亡率单调上升,生存率呈单调下降,上升或下降幅度前期大于后期,说明白桦种群在前期死亡率高,而种群后期则相对稳定.④在未来20年、40年、60年和80年中,白桦种群将呈现老龄级株数先增后减的趋势,种群稳定性长期维持较为困难.Based on the field data about Betula platyphyUa population and the theory of survival analysis, the authors worked out a static life table of Betula platyphylla, drew the curves of mortality rate, survival rate, killing value, survival rate function, mortality density function, cumulative mortality rate and hazard rate function, and analyzed the life process of population. The analysis on the age structures of Betula platyphylla populations showed that the young and middle individuals were relatively rich and the number of old individuals is in short. The survival curves of Betula platyphylla populations belonged to the Deevey I[. The monotony of cumulative mortality rate increases, while that of survival function decreases. The change of increase and decrease is that the beginning is higher than the later. This shows that in the beginning the mortality rate is higher, while at the later stage the population is relatively stable. The number of old individuals would increases at the beginning and decreases finally in 20, 40, 60, 80years lately. It is difficult to maintain the population stability.

关 键 词：白桦 天然次生林 生态特征 种群结构 

分 类 号：Q145.1[生物学—生态学]