金佛山方竹对亮叶水青冈幼树种群数量结构的影响

Effect of Chimonobambusa utilis on the Number of Saplings of Fagus lucida Population

摘要:

为探索贵州省宽阔水保护区亮叶水青冈（Fagus lucida）种群的更新维持机制，采用样方法研究金佛山方竹（Chimonobambusa utilis）对亮叶水青冈种群数量结构的影响。结果表明，较高的金佛山方竹密度降低了亮叶水青冈种群数量，亮叶水青冈株数随径级和高度级增加都呈现递减趋势；金佛山方竹密度增加有利于亮叶水青冈小径级向中径级个体的转化，而方竹密度减少则有利于中径级向大径级个体的转化；金佛山方竹密度增大降低了亮叶水青冈种群平均胸径，但增加了平均高度。这表明金佛山方竹能够影响亮叶水青冈个体数量和形态建成，亮叶水青冈通过降低胸径和增加高度来适应竹丛环境。

Abstract:

In order to understand the regeneration mechanism of Fagus lucida forest in Kuankuoshui Nature Reserve, Guizhou, the effect of Chimonobambusa utilis on population structure of F. lucida was studied by quadrat method. The results showed that the high density of C. utilis reduced the number of F. lucida population, the number of F. lucida showed decline trend along increment of diameter and height classes. The density increase of was in favor of F. lucida saplings from small diameter class to middle diameter class, which decline was good for saplings from middle diameter class to big diameter class. The high density of C. utilis reduced mean DBH (diameter at breast height) of F. lucida saplings, and increased mean height. Therefore, C. utilis could affect the quantitative structure and morphogenesis of F. lucida saplings, while F. lucida adapted to C. utilis clump environment by reducing DBH and increasing height.