色木槭天然次生林种群竞争关系研究

Competition Relationship of Populations of Natural Secondary Acer mono Forest

运用Hegyi单木竞争指数定量分析了色木槭(Acer mono)种内和种间竞争强度。结果表明,色木槭的种内竞争强度较大,占总竞争的26.1%,在早期阶段,色木槭的种内竞争强度随着径级的增加而增大,胸径大于30 cm后,其竞争强度又逐渐降低;色木槭的种间竞争强度(89.061)大于种内(31.487),色木槭种内和种间竞争强度的顺序为:色木槭>糠椴>蒙古栎>黄菠萝>胡桃楸>紫椴;随着色木槭胸径的增大,所受到的竞争压力逐渐减小,胸径在15 cm以前所受到的竞争压力最大,竞争强度与对象木的胸径大小之间的关系近似服从指数函数关系。在自然条件下,当色木槭胸径达到15 cm前时,应对其进行抚育管理以提高木材利用率。

The intraspecific and interspecific competition intensities in the secondary Acer mono forest were quantitatively analyzed by Hegyi single-tree competition index model.The results showed that the intraspecific competition intensity in A.mono was bigger,accounting for 26 percents of total competition,and the competition intensity gradually increased with the increasing tree diameter.However,the competition intensity decreased after diameter at breast height DBH was greater than 30 cm.The interspecific competition（89.061） in A.mono was more intensive than the intraspecific competition（31.487）.The competition intensity of interspecific competition with A.mono followed the order of A.monoTilia mandshuricaQuecus mongolicaPhellodendron amurenseJuglans mandshuricaTilia amurensis.The competition intensity of A.mono declined with the increasing DBH,and the stress was more intense for trees less than 15cm in DBH.The relationship between competition intensity and DBH of target trees followed the exponential function.The tending management should be actualized to increase the timber utilization quotiety when DBH of A.mono individual near 15cm in natural conditions.