论文部分内容阅读
采用样地每木调查法,通过丰富度、均匀度、多样性、层次结构复杂性和直径结构复杂性等指数进行分析比较,研究了快速城市化过程中深圳市不同立地等级黄牛木m eta种群结构。结果表明:黄牛木群落以黄牛木〔Cratoxylum cochinchinense(Lour.)B lum e〕和豹皮樟〔Litsea rotundifoliavar.oblongifolia(Nees)A llen〕两物种紧密组合为基本特征,立地等级越高,物种竞争力越强。立地条件好的黄牛木群落物种丰富度、均匀度和多样性比立地条件差的分别高1.58~1.85倍、0.67~0.87倍和1.34~1.60倍,说明缀块生境变差将导致群落层次结构趋于简单,群落不稳定。受城市化影响,黄牛木m eta种群在台湾相思(Acacia confusaM err.)群落和梅叶冬青〔Ilex asprella(Hook.etArn.)Champ.ex Benth.〕群落中明显占据优势种地位,群落有逆向演变趋势。今后应着力保护群落上层乔木层物种,改善群落缀块生境。
In this paper, we use the plots per survey method to analyze and compare the indices of abundance, evenness, diversity, hierarchical structure and diameter structure complexity, structure. The results showed that the combination of Cratoxylum cochinchinense (Lour.) B lum e and Litsea rotundifolia var. Oblongifolia (Nees) The more powerful. The species richness, evenness and diversity of the yellow woodland community with good site conditions were 1.58-1.85 times, 0.67-0.87 times and 1.34-1.60 times higher than that of the stand site respectively, which indicated that the deterioration of the patch habitat would lead to the change of community hierarchy Simple, unstable community. Affected by urbanization, the Betula m eta population clearly occupied the dominant species in the communities of Acacia confusaMerr. And Ilex asprella (Hook.et Arn.) Champ.ex Benth. Evolutionary trend. In the future, efforts should be made to protect upper layer tree species in communities and improve community patch habitats.