摘要
研究结果表明,该种群的年龄结构由一至数个相间隔的年龄波组成。据此,可将该种群的年龄结构划分为一代型、两代型和多代型三大类,进一步又可按世代(年龄波)的构成状态细分为11种类型。自然干扰因素对年龄结构具有重要影响。绝大多数年龄波的出现都与森林火有关。风倒、风折亦有影响,但其作用只能从新近发生的幼小一代中看出。高频、低强度的森林火利于形成两或多代型的年龄结构;而低频、高强度的森林火则利于形成一代型的年龄结构。不同地段自然干扰状况的差异是造成多种年龄结构类型共存的主要原因。年龄波,做为年龄结构的基本构成单元,具有明显的β分布特点。年龄波的形状大致可分为右偏、左偏、递减分布和递增分布四种类型。不同形状的年龄波与种群环境有关,是种群更新过程的综合反映。
From the view of disturbance ecology,this paper studied the species group age structure of Larix gmelini population in the north Daxinganling Moun- tains and its relation to natural disturbance factors, such as forest fire, wind- fall etc. Following results were obtained: The species group age structure of Larix gmelini population consists of one or more discrete age waves and can be derided into three groups: One-genera- tion, two-generation and multi-generation, moreover eleven types according to the structure state. Natural disturbances have an important effect on the age structure. Forest fire almost affacts all age waves, and windfall and windbre- akage are also proved to be important to the late generations. Generally, the weak fire with high frequency favors to form two or multi-generation, the strong fire with low frequency favors one-generation. The major reason for the coexistence of many types of age structure is ascribed to the differences in natural disturbance regime in each region. Age waves, being basic unit of age stru- cture, evidently show β distribution feature with the shapes of right deviation, left deviation, progressive decrease and increase distribution. The shape of age waves is related to the environment of species group, which reflects the regen- eration processes comprehansively.
出处
《林业科学》
EI
CAS
CSCD
北大核心
1992年第1期2-11,共10页
Scientia Silvae Sinicae
基金
本研究系高等学校博士学科点专项科研基金
关键词
兴安落叶松
种群
年龄结构
Larix gmelini popuplation
Species group age structure
Age wave
Natural disturbance
Forest fire
