笔架山常绿阔叶林群落结构特征

分析了福建省龙岩市笔架山常绿阔叶林群落的种类组成、乔木种群的重要值、物种多样性、水平结构和垂直结构特征.该群落共有植物186种,隶属于75个科132属,物种种类丰富,是由多个种群共建的群落.在水平空间上,8个可能的共建种群均服从聚集分布;在垂直空间上层次分化明显,在群落垂直结构的5个层次中,乔木层第2亚层除物种丰富度外,其他各项物种多样性指标在各层次中是最大的;草本层的物种丰富度、多样性指数和种间相遇机率分居第2位,群落均匀度则居第3位;灌木层的物种丰富度居第1位,但群落均匀度最小;乔木层第1亚层除群落均匀度居第2位外,其他指标均最小;藤本的物种多样性各项指标要么居第3位,要么居第4位.结果还表明群落的Simpson指数和种间相遇机率(PIE)的数值几乎相等.

STRUCTURAL FEATURES OF EVERGREEN BROAD-LEAVED FOREST COMMUNITY IN BIJIA MOUNTAIN OF LONGYAN, FUJIAN

The species composition, importance values of tree population, species diversity and spatial structure of evergreen broad leaved forest community in Bijia mountain of Longyan, Fujian, were analysed. The community is composed of 186 species belonging to 75 families and 132 genera, and the community of richer plant species contains multiple dominance populations. The horizontal spatial pattern of 8 dominance populations conform to aggregated distribution. The tree layer can be divided into multiple layers in terms of height. The species diversity indexes of the second sub layer of tree layer are biggest in the five layers of community vertical structure, except species richness. The species richness and diversity index of herb layer are the second, and the community evenness is the third. The species richness of shrub layer is the first, and the community evenness is the smallest. The species diversity indexes of the first sub layer of tree layer, except the community evenness is the second, are the smallest. The diversity indexes of vine are the third or the fourth. The result also shows that the values of the Simpson's index and the interspecific encounter probability are almost equal in the community.