封育次生马尾松(Pinus massoniana)林优势种群竞争密度效应

COMPETITION DENSITY EFFECT OF DOMINANT POPULATION IN SECONDARY PINUS MASSONIANA FOREST BY CLOSING MANAGEMENT

以退化红壤区封山育林植被恢复过程中优势种群马尾松为研究对象,研究不同恢复阶段马尾松种群竞争密度效应,并提出一个适用性更强的竞争密度效应模型.研究表明,退化红壤区植被恢复过程中优势种群马尾松竞争密度效应明显,优势种群平均胸径(D)、平均胸高断面积(S)、平均单株材积(V)、林分蓄积量 (M)与种群密度 (ρ)的竞争密度关系密切,达到极显著水平(α<0. 01);新竞争密度效应模型较前人模型描述C-D效应效果更理想,可在森林竞争密度效应研究中应用. 表 4参

Regarded the secondary Pinus massoniana forest by closing management in degraded red soil region as investigated object, the competition density effect of P. massoniana during different restoration stages was studied. The results showed that the competition density effect of the dominant population in degraded red soil region was obviously, the relationships of competition density among mean diameter at breast height (D), mean area at breast height (S), mean individual volume (V), stand volume (M) and population density (ρ) were closely related, all of which reached significant level(α<0.01). A new competition density effect model with strong applicability was presented in this paper and the results from P. massoniana showed that the new competition density effect model was the best among all other models developed before, indicating that it could be used in the research of forest competition density effect. Tab 4, Ref 19