气候变化给生物多样性保护带来严重威胁，种群动态是生物多样性研究的核心问题之一。年龄结构和性别比例是预测种群动态的重要指标，种群性别比例的失衡是种群锐减的重要原因之一。然而，以往有关高大木本植物研究中大多没有涉及性别比例。那么，气候持续改变的情景下，雌雄异株的植物种群会有怎样的变化，其种群维持的机制是什么？本项目选取亚热带山地雌雄异株植物连香树为研究对象，运用种群调查学方法和分子生物学技术（SSR分子标记），调查不同生境下种群特征（年龄结构和性别比例），筛选性别鉴定的特异性引物并鉴定未成年个体的性别比例，研究不同生活史阶段性别比例成因和种群的主要更新方式。该项目旨在探讨亚热带山地不同生境下孑遗木本植物的种群动态，揭示种群维持机制。研究结果不仅可以促进种群生态学理论的发展，也为孑遗木本植物的保护提供更科学的理论支持。

Climate change is a great threat to biodiversity conservation, population dynamics is a core issue in biodiversity. Age structure and sex ratio are important indicators for predicting population dynamics, and sex ratio imbalance is an main reason for population size decline sharply. However, sex ratio is not considered in previous studies on trees. What is the population dynamics of dioecious plants facing sustain climate change, and what is the maintaining mechanism? This project aims to investigate population characteristics (age structure and sex ratio), and to identify sex ratio of a relict woody plant Cercidiphyllum japonicum in subtropical mountains by integrating population survey methods and molecular biological techniques (SSR). To uncover the maintaining mechanism, we will reveal the causes for sex ratio at different life cycle stages and main regeneration strategy of C. japonicum in different habitats. Our results will advance the development of ecological theory, and provide a valid framework for conserving of relict woody plants.