黄土高原柴松群落优势乔木树种的竞争关系  

Competitive relationships of dominant tree species in Pinus tabulaefirmis f. shekanensis community on Loess Plateau

作　　者：孙嘉男[1] 王孝安[1] 郭华[1] 王世雄[1] 

机构地区：[1]陕西师范大学生命科学学院,西安710062

出　　处：《生态学杂志》2010年第11期2162-2167,共6页Chinese Journal of Ecology

基　　金：国家重点基础研究与发展规划资助项目(2002CB111505)

摘　　要：采用Voronoi图确定竞争单元的方法,从树木胸径和冠幅角度对黄土高原柴松（Pinus tabulaefirmisf.shekanensis）群落的优势乔木树种——柴松和辽东栎（Quercus liaotungensis）的种内、种间竞争强度进行了定量分析。结果表明：1）柴松种群受到强烈的种间树冠竞争和种内的胸径竞争,在胸径〈10cm时受到来自种内种间的竞争压力最大,其结果对柴松的生长有显著影响;2）辽东栎种群在胸径〈5cm时受到更多来自种间林冠的竞争,当胸径为5~10cm时种内冠幅间的竞争强度超过种间,种间冠幅竞争强度与辽东栎的林木生长无显著相关,说明柴松不能对辽东栎产生强烈持续的树冠竞争;3）柴松、辽东栎种群竞争强度均随着对象木径阶的增大而减小,竞争强度（CI）与对象木胸径大小（D）服从幂函数（CI=ADB）关系。By using two competition index models with diameter at breast height（DBH）and crown width as parameters respectively,the competitive units based on Voronoi diagram were applied quantitatively to analyze the intra-and inter-specific competition of Pinus tabulaeformis f.shekannesis and Quercus liaotungensis（Liaotung oak）in the P.tabulaeformis f.shekannesis community on Loess Plateau.The results showed that P.tabulaeformis f.shekannesis population suffered intense intra-specific competition for DBH and intense inter-specific competition for crown width.The maximum competitive stress appeared in the fast-growing period with DBH10 cm,and the stress affected tree growth significantly.Liaotung oak population suffered greater inter-specific competition for crown width at DBH5 cm,and greater intra-specific competition for crown width at 5 cmDBH10 cm.The inter-specific competition for crown width had no significant effects on the tree growth of Liaotung oak,indicating that P.tabulaeformis f.shekannesis couldn＇t exert the intense and continuous competition for crown width on Liaotung oak.The competition intensity of the two tree species declined with increasing diameter class of the trees.The relationship between the competition intensity（CI）and DBH（D）of target trees followed the equation CI=ADB.

关 键 词：黄土高原 柴松 辽东栎 VORONOI图 竞争 

分 类 号：S718.5[农业科学—林学]