横断山区水生植物集合群落功能多样性的空间格局及驱动机制

横断山区是全球生物多样性的热点地区之一，是我国生物多样性优先保护的关键地区，该区域的水生植物群落多样性格局及驱动机制是当前保护生物学的重要研究内容。横断山区因地理阻隔产生的空间扩散限制、区域的垂直地带性气候差异和局域的生境异质性是影响水生植物群落分布的重要因素。本研究拟采用湖泊生态学和功能生态学研究方法，获取横断山区水生植物群落结构特征、环境因子、空间地理坐标等参数，测定表征水生植物形态、生理、繁殖和扩散的功能性状。从集合群落的角度，分析水生植物群落功能多样性对区域和局域生态过程的响应；阐明“功能多样性-环境梯度”关系在不同区域气候带间的变化规律；解析空间、局域及区域变量对水生植物集合群落功能多样性的相对影响，检验基于空间的扩散限制和基于功能性状的生境过滤作用影响水生植物群落功能结构的相对重要性。本研究首次从集合群落功能多样性的角度阐述横断山区水生植物群落分布的空间格局及驱动机制。

The Hengduan Mountain region (HDMR) is one of the hotspots of biodiversity in the world, and the key area for biodiversity conservation in China. The diversity patterns and maintaining mechanisms of aquatic macrophytes community is the major research program for conservation biology in HDMR. The spatially dispersal limitation caused by geographical barriers, the vertical zonal difference in regional climate and the local habitat heterogeneity are important factors affecting the distribution of aquatic macrophytes communities in HDMR. Through a series field surveys on aquatic macrophytes communities in studied lakes, this study will determine the parameters of community structures, environmental and spatial factor in HDMR, and examine the functional traits characterizing individual morphology, physiology, reproduction and dispersion. Based on the perspective of metacommunity, this study will analyze the responses of functional diversity pattern to regional and local processes, and then clarify the relationships between functional diversity and environmental gradients at different regions. We will examine the relative importance of local environmental gradients, regional climate variables and spatial factors in determining the functional diversity patterns of aquatic macrophytes, and thus disentangle the relative role of space-based dispersal limitation and trait-based habitat filtering influencing community functional composition in HDMR. Furthermore, this study will firstly reveal the patterns and mechanisms driving spatial distribution of aquatic macrophytes in HDMR from the perspective of metacommunity functional diversity.