摘要:缙云山细枝柃（Eurya loquaiana）种群包含一些性别变异个体，表现出"亚雌雄异株"的特点。为分析该种群的性别格局，了解柃木属植物性别系统的进化及其适应机制，在缙云山细枝柃分布的不同生境中设置8个20 m×20 m长期观测样地，分析性比变化及其与环境、年龄结构的关系，同时设置1个20 m×60 m样地，分析植株的空间分布格局及性别间在空间上的关联。结果显示：（1）缙云山细枝柃种群总体上性别偏雌，雌雄比为1.43，性别变异株比例达14.42%。（2）各样地中雌雄比和性别变异株比例差异较大，性别变异株比例与干扰强度呈较强正相关而与海拔高度和郁闭度呈较强负相关，显示变异株的出现可能与人为干扰有一定联系；雌雄比与样地中细枝柃平均基径显著正相关，可能随着林龄的增加，雌雄比有增加的趋势。（3）细枝柃个体在空间上整体呈聚集分布，雌株、雄株及性别变异株主要呈随机分布，在部分尺度偏向于聚集分布。（4）雌株和雄株对环境异质性的响应相似，在空间分布上有一定的正相关。上述结果反应了缙云山细枝柃种群的性别格局及其生态适应机制。



Abstract:It is uaually found a number of sex variant plants in the Eurya loquaiana Dunn population in Jinyun Mountain, which plants show a subdioecy characteristic. However, it is still unrevealed the gender patten, sexual evolution and adaptive mechanisms of these E. loquaiana populations. In this study, 8 sampling plots in 20 m×20 m were set in different habitats, in order to analyse the relationship between sex ratio and environmental variations, and age structure. Additionally, a sampling plot in size of 20 m×60 m was set, then the investigation of plant distribution pattern and spatial correlation between different sex plants were conducted. The results of this study indicated that (1) There were more female plants in E. loquaiana population. The ratio between female and male plants was 1.43, the percentage of sex variant plants in the studied population was 14.42%. (2) The sex ratio and percentage of sex variant plants varied in different sampling plots. Moreover, it was found that the percentage of sex variant plants positively correlated with intensity of disturbance, but negatively correlated with altitude and crown density. The reason for these findings was presumably the human disturbance. At the same time, it was discovered that the sex ratio of studied population significantly correlated with the basal diameter of E. loquaiana plants. And the sex ratio might increase with forest age. (3) On the whole, studied E. loquaiana population exhibited clumped-distribution pattern. The male plants, female plants and sex variant plants mainly randomly distributed, but in some scales, they showed clumped-distribution. (4) The male and female plants behaved the similar responses to the environmental variations. They performed positively relationship with each other in spatial distribution. The results of this study uncovered the gender pattern of E. loquaiana population and its ecological adaptive mechanisms in Jinyun Mountain.





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