嘉陵江流域南充金城山森林群落结构特征分析

Forest Community Structural Features of Jincheng Mountain in Nanchong Region in Jialing River Basin

在采用样方法野外调查的基础上,进行组平均聚类,运用"空间序列代替时间序列"的方法,对嘉陵江流域南充金城山国家森林公园的森林群落特征进行了研究。将其划分为8个群落类型,并分别论述了各群落的结构特征,绘制了种群的年龄结构和存活曲线图。由种群的大小级结构动态和种群的存活曲线分析了各优势种群的结构格局,发现柏木林、杉木麻栎林种群为下降种群,马尾松林、马尾松川灰木林、川灰木山胡椒林种群为稳定种群,柏木白栎林、马尾松柏木林、麻栎白栎林种群为增长种群。生境条件和人为干扰是影响种群年龄结构和动态的重要因素。因此,对金城山国家森林公园的森林群落要加强保护、减少人为干扰和加强抚育管理。

On the basis of quadrate investigation, with the method of ＂spatial sere substituting for time sere＂, the communities of Jinchengshan National Forest Park were divided into eight types by group average clustering, and each structural feature of the communities was discussed individually. Moreover, the pattern for dominant population structure was analyzed by population structure development and survival curve. The results showed that Cupressus funebris, Cunninghamia lanceolala ＋ belonged to the declining populations, whereas, Cupressus funebris ＋ Quercus fabric, Quercus acuissima Pinus massoniana fabric were growing populations, and szechumensis ＋ Lindera setchuenensis, Pinus massoniana ＋ kept stationary. Habitat condition and human disturbance Symplocos szechumensis and Pinus massoniana were the main factors affecting the age structure and the dynamics of populations, and thus, the protection and fostering of the communities of Jinchengshan National Forest Park should be reinforced, meanwhile, the human disturbance should be reduced.