栲树种群的年龄结构及其生长特征

为了了解栲树的更新方式和更新动态，研究了栲树的生长特征和种群年龄结构.结果表明：栲树种群的年龄结构呈“间歇型”，经历了两个死亡高峰，并存在一个长达30年的断层；栲树的生长受光照的影响，具有很强的可塑性；由于林下光照弱且在垂直空间上不存在差异，栲树生长5～8年后进入生长的第1个抑制期，其年高生长速度可小于0.1 m，并可维持10年；栲树生长的第1个抑制期的起始时间对应着种群第1个死亡高峰期的结束时间，而其结束时间对应着种群第2个死亡高峰期的起始时间，表明栲树生长特征是影响其种群年龄结构的关键因素.

Age structure and growth characteristic of Castanopsis fargesii population

In this paper, the age structure and growth characteristics of Castanopsis fargesii population in a shade-tolerant broadleaved evergreen forest were studied, aimed to understand more about the regeneration patterns and dynamics of this population. The results showed that the age structure of C. fargesii population was of sporadic type, with two death peaks of a 30-year gap. This population had a good plasticity in growth to light condition. Because there were no significant differences in light condition under the canopy in vertical, the saplings came into their first suppression period when they were 5-8 years old, with a height growth rate less than 0. 1 m x a(-1) lasting for 10 years. The beginning time of the first growth suppression period was by the end of the first death peak of the population, and the ending time of the first growth suppression period was at the beginning of the second death peak of the population, demonstrating that growth characteristic was the key factor affecting the age structure of C. fargesii.