刺槐(Robinia pseudoacacia)无性系种群结构与生长动态的研究

研究了刺槐克隆种群的种群结构和生长动态.结果表明，刺槐克隆种群中幼年分株数量较多，死亡率较高；成年个体数量较少，死亡率较低，而且相对稳定，种群数量结构成金字塔型；无性系产生分株的时间较晚，分株的数量正处于上升阶段.无性系中刺槐基株的基径、高度、冠幅远远大于分株.刺槐分株在幼年时期高生长和冠幅的生长均较快，当生长到一定的年龄逐渐缓慢下来.克隆分株的生长、数量动态主要受克隆整合的内部调节机制和外部环境中灌木层、草本层竞争的影响.

A study of population structure and dynamics of Robinia pseudoacacia clones

The population structure and dynamics of Robinia pseudoacacia clones are studied.The result indicates that the clone population has relative stable and pyramidal number structure,made up of abundant infancy daughter ramets with high death rate,and few adult daughter ramets with low death rate.Clones produce daughter ramets at high age stage and the number of daughter ramets is increasing.The diameter at ground height(DGH),height and canopy width of genet are significantly larger than those of daughter ramets.The growth of height and canopy width is accelerated at infancy stage,but relatively stable at adult stage.The growth and dynamics of daughter ramets are affected by genet though clonal integration,and competition from shrubs and herbage of surroundings.