海南尖峰岭热带山地雨林60 ha大样地木本植物性别系统数量特征 / Numerical characteristics of plant sexual system of the woody plants in the 60 ha plot in the tropical rain forest in Jianfengling, Hainan Island
热带山地雨林中植物不同性别系统的数量和空间分布特征如何? 是否受自然环境条件影响? 这些问题的回答有助于更深入理解群落物种多样性是如何形成的。本文以海南尖峰岭热带山地雨林60 ha大样地中胸径大于1 cm的木本植物为研究对象, 描述了样地内木本植物性别系统的数量特征, 分析了雌雄异株植物空间分布与地形因子的相关关系。结果表明: 大样地内289种木本种子植物中有两性花植物176种, 单性花植物113种; 在单性花植物中, 51种为雌雄同株, 62种为雌雄异株。单性花植物植株数占所有植株总数的36.2%; 雌雄异株植物植株数占所有植株总数的21.5%, 占单性花植物植株数的59.5%。在20 m × 20 m样方的空间尺度, 雌雄异株植物呈现聚集分布的物种共有31种。以20 m × 20 m样方为分析单元, 雌雄异株植物种类的性别比例与海拔、凹凸度和坡度呈弱正相关; 个体相对多度仅和海拔呈弱正相关, 与坡度和凹凸度无相关; 而3个性别系统多样性指数与海拔、凹凸度和坡度均无显著关联。可见雌雄异株植物在海南热带山地雨林中占据了较大的比例, 但大部分种类种群较小, 其数量分布特征与地形因素紧密相关, 雌雄异株植物的存在对群落物种多样性的形成有较大贡献。
How plants with different sexual systems grow and distribute in the community? Are they influenced by environmental factors? The answer to these questions is helpful to understand how species diversity is shaped in the plant community. This study summarized the numerical characteristics of sexual systems and the relationship between the distribution of dioecious plants and the topographical factors. Results showed that of the 289 woody seed plants recorded in the 60 ha plot, 176 species are bisexual plants and 113 species are unisexual plants. Of the 113 unisexual species, 51 are monoecious and 62 are dioecious plants. The abundance of unisexual plants accounts for 36.2% of all individuals recorded in the whole plot. The dioecious plants account for 21.5% of all individuals recorded and 59.5% of all individuals of unisexual plants in the plot. At the 20 m × 20 m quadrat spatial scale, 31 dioecious species showed aggregated distribution. Proportion of number of dioecious species of all species showed weak and positive correlation with altitude, convex and slope, but relative abundance of dioecious plants only showed weak and positive correlation with altitude. Furthermore, three diversity indices of plant sexual system did not show significant correlation with altitude, convex and slope. In sum, dioecious plants occupy a large proportion but most species only have relatively small population in the tropical mountain rain forest in Hainan, which are closely correlated with the topographical factors by the changes of numerical characteristics. The existence of dioecious plants has important contribution to the formation of species diversity in the plant community.
Abstract in Chinese and English; article in Chinese only.