湖北宜昌公益林群落结构特征的分析

Structural Features of the Communities of Public Benefit Forests in Yichang, Hubei Province

利用组平均聚类方法,宜昌市公益林群落划分为8个群落类型,分别论述了各群落的结构特征,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,发现马尾松林、马尾松石栎林、柏木林、曼椆水丝梨林种群为下降种群，乌冈栎林、麻栎林种群为稳定种群,石栎樟树林、短柄枹栎化香林种群为增长种群。

The communities of public benefit forests were divided into eight types by group average clustering; therefore every structural feature of the communities was discussed. Moreover. the pattern for dominant population structure was analyzed by population structure development and survival curve line. The results show that P. massoniana＋Lithocarpus,Cupressaceae,Cyclobalnopsis oxyodon＋ Chinese all belong to the declining populations, contrary to the growing populations of Lithocarpus＋Cinnamonum Trew and Quercus serrata var.brcvipetinlata and Platcarya strobilacea.but Q.phillyracrvis Cheng and Q.acutissima Carr keep stationary.