摘要
为研究红椿(Toona ciliata Roem)种群动态,将林木径级代表年龄结构,分析了龄级与种群数量动态,编制了静态生命表,绘制并分析了存活曲线、死亡率曲线和种群损失度曲线,对种群进行了谱分析。结果表明,七姊妹山红椿种群衰退动态指数Vpi=32.32%,稳定动态指数Vpi′=4.039%,属于增长型稳定种群,风险敏感度较高。存活曲线接近DeeveyⅡ型,各龄级个体具有大体相等的死亡率。死亡率qx与损失率Kx均在1、4、6级出现高峰,说明不同阶段红椿生理特性、环境筛与人为干扰因素对种群的影响较大。波谱分析基波A1=0.752 8,A3出现明显小周期,表明红椿种群天然更新存在着周期性,且有小周期的多谐波叠加。
To research the dynamics of Toona ciliata Roem population in Qizimeishan Mountain, diameter classes of T. ciliata plants were transformed into according age classes; numeral dynamics of the plants in different age classes were analyzed; a static life table was made; curves of survival rate, death rate and vanishing index were drawn; and a spectral analysis of the population was conducted. The research indicates that the population is in growth form, as dynamics index Vpi was 32.32%; and V/ was 4.039% when stress considered; and the sensitiveness value was comparatively high. The survival curve conforms approximately to that of Deevey Ⅱ , illustrating a general equivalence of death rate in different age classes, qx and Kx surge to peaks in 1, 4 and 6 age classes simultaneously, showing that the physiological features at different growing stages, environmental sieves and human disturbances all influence the T. ciliata population. In spectral analysis of the population, the fundamental wave A1 is 0.752 8, while A3 has an obvious minor cycle deviating from that of A1, demonstrating a periodicity in natural regeneration of T. ciliata population. with multi-harmonic wave supervosition of minor cvcles.
出处
《湖北农业科学》
2015年第22期5632-5636,共5页
Hubei Agricultural Sciences
基金
湖北省公益性研究项目(2012DBA40001)
