庞泉沟自然保护区优势种种群竞争关系及其动态预测

利用Hegyi单木竞争指数模型对庞泉沟自然保护区优势种群的种内、种间竞争关系进行了定量分析。结果表明:种内和种间竞争强度随着林木径级的增大而逐渐减小,种内竞争较之与其伴生树种间的竞争剧烈。华北落叶松种内、种间竞争强度大小顺序为:种内>云杉>红桦>白桦>关帝柳>花楸>山杨。竞争强度与对象木胸径之间存在显著的幂函数非线性回归关系,回归结果与林分实际相符,从而为庞泉沟自然保护区混交林理论研究和合理经营提供了科学依据。

Competition Relationship among Dominant Species in Pangquangou Nature Reserve and Dynamic Forecasting

Using Hegyi individual tree competition index model,the relation of intraspecific and interspecific competition of dominant species in Pangquangou Nature Reserve was quantitatively analyzed.The results showed that the intraspecific and interspecific competition intensity decreased gradually with the increasing of forest tree diameter class and the interspecific competition was stronger than those in associated tree species.The degressive order of the intraspecific and interspecific competition intensity in Larix principisrupprechtii was,for interspecific competition,Spruce,Betula albosinensis,Betula platyphylla,Salicaceae sinica,Sorbus pohuashanensis,Populus davidiana.A remarkable power model of the relationship between the competition intensity and the diameter class of objective tree is established.The competition model was established with good regression result.The study provides the scientific basis for the theory research and reasonable management of mixed stand in Pangquangou Nature Reserve.