米仓山巴山水青冈群落结构特征及更新状况分析

Analysis of the Community Structure and Regeneration Status of Fagus pashanica on the Micang Mountain

巴山水青冈林在四川盆地北缘中山地带有保存比较完整的天然常绿、落叶阔叶混交林类型。以米仓山为重点,开展了对巴山水青冈群落结构特征及更新状况分析,结果表明:①巴山水青冈林林冠整齐,分层明显,有乔木层、灌木层、草本层和苔藓层;巴山水青冈为乔木主要优势树种。②在巴山水青冈天然林群落中,生长季节具有温热多湿的特征,群落高位芽植物分布最多,占了56.4%,其次为地面芽植物,占35.1%。③巴山水青冈林木胸径和年龄的分级均表现为中间高两头低的对称分布,林下巴山水青冈幼苗株数每hm2在2 800株以上,表现了群落结构稳定。

Relatively complete natural evergreen and deciduous broad-leaved mixed forest types of Fagus pashanica are found in medium mountainous zone in the northern margin of the Sichuan Basin. Studies were made of the community structure and status of Fagus pashanica on Mieangshan Mountain. The results showed that （1）Fagus pashanica canopy was neat, having tree layer, shrub layer, herb layer and the moss layer;Fagus pashanica was main dominant tree species. （2）In Fagus pashanica natural forest communities, its growing season had warm and humid features, community phanerophytes had the largest distribution, accounting for 56. 4%, followed by hemicryptophytes, accounting for 35. 1%. （3） Fagus pashanica DBH and age classification showed a symmetrical distribution, Fagus pazhanica seedling number per hectare was more than 2 800. disolavinz the stabilitv of the communitv structure.