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Intraspecific and Interspecific Competition of Tree Layers in Natural Pinus tabulae formis Forest in Ziwuling Mountains
Author(s): 
Pages: 1882-1887
Year: Issue:  9
Journal: Acta Botanica Boreali-Occidentalia Sinica

Keyword:  竞争指数油松种内竞争种间竞争;
Abstract: 采用改进的竞争指数模型研究了甘肃省子午岭天然油松林乔木层种内和种间竞争强度.结果发现:(1)随对象木胸径的增大,油松种群因自疏作用使植株距离增加,种内竞争强度降低.(2)油松群落内其它物种虽较多,但个体普遍较小,种间竞争相对较弱,种内与种间竞争关系顺序为:油松种内>辽东栎>漆树>春榆.(3)竞争强度与对象木胸径的关系服从幂函数关系,当油松胸径达25 cm以上时,竞争强度变化不大,所得的预测模型能很好地预测油松种内和种间的竞争强度.(4)改进的竞争指数模型能很好地度量油松的种内和种间竞争强度.
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