松山自然保护区辽东栎群落种内、种间竞争关系

为了研究辽东栎群落种内与种间关系,采用Hegyi单木竞争指数模型(I_c)对松山自然保护区林辽东栎种群的种内、种间竞争强度进行定量分析.结果表明,辽东栎种内、种间竞争强度随着林木径级的增大而逐渐减小;种内、种间的竞争强度顺序为:辽东栎种内>白蜡>山杏>鹅耳栎.根据样地样本数统计回归,得到竞争强度与对象木的胸径服从幂函数关系(I_c=AD~(-B))最为显著,并利用得到的幂函数模型预测了辽东栎种内、种间的竞争强度,当辽东栎胸径达到25 cm以上时,竞争强度变化不大.因此,应在此前采取适当的人工疏伐措施来促进植株生长和增强生态系统的稳定性.

Intraspecific and Interspecific Competition of Quercus Liaotungensis Community in Songshan Nature Reserve

In order to study the intraspecific and interspecific relationship in the Quercus liaotungensis community, the intraspecific and interspecific competition intensity was investigated by using Hegyi competition index model for individual tree(IC) in Songshan Nature Reserve. Results show ed that the intraspecific and interspecific competition intensity in the community gradually decreased with the increase in forest DBH level. The trees, in terms of the intraspecific and interspecific competitio n's intensity, were in the order of Quercus liaotungensis>Fr ax inus chinensis>Ar meniaca sibirica> Carp inus turcz aninow ii. A ccording to the sample number statistics, the power function of IC=AD^-Bfor the competition intensity and the objective tree DBH distribution was most remarkable. The intraspecific and interspecific competition intensity in Quercus liaotungensis community was forecasted. When the diameter of Quercus liaotungensis tree was above 25cm,the change in competition intensity w as very small. Therefore, suitable artificial measures should be taken to promote plant grow th and enhance ecosystem stability