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    龙茹, 尚策, 曲上, 张志翔. 大叶杨群落植物性系统多样性的分布格局[J]. 北京林业大学学报, 2011, 33(5): 34-41.
    引用本文: 龙茹, 尚策, 曲上, 张志翔. 大叶杨群落植物性系统多样性的分布格局[J]. 北京林业大学学报, 2011, 33(5): 34-41.
    LONG Ru, SHANG Ce, QU Shang, ZHANG Zhi-xiang. Distribution pattern of plant sexual system diversity in Populus lasiocarpa Oliv. community.[J]. Journal of Beijing Forestry University, 2011, 33(5): 34-41.
    Citation: LONG Ru, SHANG Ce, QU Shang, ZHANG Zhi-xiang. Distribution pattern of plant sexual system diversity in Populus lasiocarpa Oliv. community.[J]. Journal of Beijing Forestry University, 2011, 33(5): 34-41.

    大叶杨群落植物性系统多样性的分布格局

    Distribution pattern of plant sexual system diversity in Populus lasiocarpa Oliv. community.

    • 摘要: 应用丰富度指数、多样性指数、均匀度指数等指标,分析了湖北大老岭自然保护区不同样地大叶杨群落物种和性系统多样性。结果表明:组成大叶杨群落的植物共有182种,隶属于73科143属,其中单种属和寡种属占优势。大叶杨群落物种丰富度受海拔、坡向和林内小气候的影响,在样方3达峰值。从4个样地科属种的共有性来看,科的共有性较高,种的共有性较低,与样地间微环境的差异程度有关。大叶杨群落是演替过程中的群落,大叶杨的年龄结构除2号样地表现为增长型结构外,其他3个样地均是衰退型。群落植物性系统类型较丰富,两性花植物最多,雌雄异株和雌雄同株植物在大叶杨群落中也占有重要地位;乔木层中重要的性系统类型是雌雄异株植物,与建群种大叶杨的性系统一致,灌木层和草本层中两性花植物是重要的类型,并且两性花植物所占的比例随草本层植物种类的增加而增大。此外乔木层中建群种大叶杨的重要值最大且在样方3中最高。4个样地中物种多样性和植物性系统多样性指数变化一致,即乔木层多样性指数的变化不大,灌木层随海拔的升高逐渐增大,草本层在样方3达到最大,这种变化与各样地不同层物种数的变化相一致;在最低海拔样方中,各层的均匀度指数最大,物种和植物性系统分布最均匀。

       

      Abstract: The diversity of plant species and sexual system in a Populus lasiocarpa Oliv. community in the Dalaoling Nature Reserve of Hubei Province were assessed by richness index, diversity index and evenness index. In total, 182 species representing 143 genera in 73 families are recorded in P. lasiocarpa community. The genera with only one or two species occupy the dominant position in community. The species richness in P. lasiocarpa community is affected by the elevation, slope and the forest microenvironment. It reaches the maximum value at the quadrat 3. The more common families and less common species among the four quadrats are related to the degrees of difference among their microenvironments. The P. lasiocarpa community is in the process of succession. The age structure of P. lasiocarpa belongs to an increasing type in the quadrat 1, but a declining type for the other three quadrats. The sexual system of plants is diverse in P. lasiocarpa community. Hermaphroditism has the highest proportion and monoecious and dioecious plants also play the important role in the community. In the tree layer, the most important type is dioecy, which is consistent with the sexual system of the constructive species. The hermaphroditism is the most important type in the shrub and herb layers and the proportion of hermaphroditism increases with the increasing number of species in the herb layer. In addition, the importance values of the constructive species, P. lasiocarpa, is the maximum in the tree layer, especially in the quadrat 3. The changes of species diversity index are consistent with sexual system diversity index in the four quadrats. The diversity index of the tree layer change little, but it increased gradually with the increasing elevation in the shrub layer and reached the maximum at the quadrat 3 in the herb layer, which is affected by the number of species in different layers. The evenness index is the maximum in the lowest elevation in all three layers, indicating that the most even distribution of plant species and sexual system.

       

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