戴云山红楠种群优势度增长规律研究

Study on dominance growth law of Machilus Thunbergii population in Daiyun mountain

运用Logistic模型、张-Logistic模型、刘-Logistic模型、改进Logistic模型探讨戴云山红楠种群优势度增长规律,并运用改进单纯形法对模型参数进行优化。结果表明,改进Logistic模型比其他模型更符合红楠种群优势度增长趋势。该模型残差平方和为0.1454、内禀增长率为0.4635,最大增长速度出现在第7龄级附近,即胸径60～70cm时期,平衡位置在环境容量为1.2049m2/hm2处,其结果可为戴云山红楠种群的保护和管理提供科学依据。

Growth dynamics of dominance of Machilus Thunbergii population was detected based on Logistic-model, Zhang-Logistic model, Liu-Logistic model and modified Logistic model. And a new model was optimized from the modified simplex method. The results showed that modified Logistic model was more suitable than other models to simulate the actual growth trend of Machilus Thunbergii population. The residual sum of squares was 0.1454, and the intrinsic growth rate was 0.4635. The highest growth rate of basal area was the seventh age classes, namely the phase when breast diameter was 60~70cm, and the basal area reached 1.2049 m2/hm2. The results would provide a theoretical basis for the protection and management of Machilus Thunbergii population.