永定县巴戟天次生林群落数量特征及物种多样性

Analysis of plant community characteristics and species diversity of Morinda officinalis secondary forest in Fujian Province

以福建省永定县湖山乡巴戟天次生林为研究对象,分析其群落物种重要值及物种多样性。研究结果表明:在巴戟天次生林群落组成上,乔木层以杨梅、阿丁枫为优势种,灌木层以暗色菝葜、沿海紫金牛为优势种,草本层以芒萁、铁线蕨为优势种;灌木层的物种丰富度最高;乔木层的均匀度最高;Shannon-wiener指数(H′)计算所得物种多样性为乔木层>灌木层>草本层,而Simpson指数(λ)值正好相反,主要是由于乔木层的稀有物种比较多,而草本层中芒萁的高优势度引起的。

The community spatial structure characteristics, species composition, species significant values and species diversity of the community features of Morinda officinalis secondary forest in Yongding country were analyzed. The results showed that there were a small amount of plant species, the vertical layers of community were distinct, the structure was integrated and the species composition was abundant at initial stage of stand restoration of Morinda officinalis secondary forest. The dominant species of the community were just as follows. Myrica rubra and Altingia chinensis in arbor layer, Smila lanceaefolia and Ardisia japonila in shrub layer, and Dicranopteris linearls and Adiantum eapillus-venerisin herb layer. The shrub layer possessed the greatest richness while the arbor layer owned the highest evenness; according to the Shannon-wiener diversity index, the arbor layer was the first place, followed by the shrub layer and the herb layer. However, because of plenty of rare species in arbor layer and the high dominace of Dicranopteris linearis in herb layer, the result of Simpson index was opposite.