大别山五针松种内和种间竞争强度

通过对安徽省岳西县大别山五针松群落内的53株对象木及2079株竞争木的调查,运用Hegyi单木竞争模型分析了大别山五针松的种内和种间竞争强度。结果表明,大别山五针松的种内和种间竞争强度分别为17.11%和82.89%,说明竞争主要来自种间。大别山五针松的伴生种较多,种内与主要伴生种间的竞争关系为短柄枹大别山五针松种内黄山松满山红茅栗金缕梅紫茎四照花灯台树鹅耳枥。竞争强度随对象木胸径的增大而减小,当对象木的胸径小于25cm时,所受到的竞争强度较大;当胸径在25cm以上时,竞争强度变化很小,二者符合幂函数关系(CI=AD-B),所得的预测模型能很好的预测大别山五针松种内和种间竞争强度。

Intraspecific and interspecific competition of Pinus dabeshanesis

In this study, we investigated the intraspecific and interspecific competition of Pinus dabeshanesis (P. dabeshanesis) in Dabieshan Mountains, Yuexi county of Anhui province, using Hegyi individual competitive indices (CI) model. The competition intensity was analysed from the 53 target trees and 2079 competitive trees within the P. dabeshanesis community. The results showed that intraspecific and interspecific competition intensity of P. dabeshanesis accounted for 17.11% and 82.89% in the total competition intensity, respectively, indicating a remarkable effect of the interspecific competition. The value of the main competition intensity was laid out in numerical order, i.e., Quercus serrata > P. dabeshanesis > Pinus taiwanensis > Rhododendron mariesii > Castanea seguinii > Hamamelis mollis > Stewartia sinensis > Dendrobenthamia hupehensis > Bothrocaryum controversum > Carpinus turczaninowii. Notably, the competition intensity of P. dabeshanesis decreased inversely to diameter of the breast height (DBH), which showed a stronger competition at DBH of < 25 cm and appeared weaker at DBH over 25 cm. The relationship between the whole forest competition intensity and DBH of the target tree followed the power function (CI= AD^-B). In conclusion, this model could effectively predict the intraspecific and interspecific competition of P. dabeshanesis.