浙西南三大外流区水生植物多样性格局驱动力和压力研究

项目名称： 浙西南三大外流区水生植物多样性格局驱动力和压力研究

项目编号： No.31300297

项目类型： 青年科学基金项目

立项/批准年度： 2014

项目学科： 生物科学

项目作者： 王金旺

作者单位： 浙江省农业科学院

项目金额： 23万元

中文摘要： 相对陆生植物，水生植物的分布较少受到物种扩散的影响，传统上认为局域生态因子和物种间相互作用决定着水生植物群落组成；越来越多的研究表明，在区域尺度上，局域生态因子和区域过程（如物种扩散（种库））共同调控着物种分布。河流生态系统复杂的网状结构可能通过调控物种扩散途径影响水生植物的分布。土地利用和河流梯级开发不同程度影响了河流生态系统生境间的联通性。本研究选择浙西南三大外流区生态系统中的水生植物为对象，研究局域生境因子与水生植物多样性之间关系，以及生境斑块的联通性对水生植物α、β、γ多样性格局影响。利用地理信息技术和典型对应分析方法，揭示局域过程和区域过程在河流生态系统中水生植物多样性格局中的作用，阐明浙西南三大外流区水生植物多样性格局的驱动力和压力。该研究结果有助于深入理解不同尺度下水生植物在河流生态系统中的分布格局，为河流生态系统生物多样性保护提供理论依据。

中文关键词： 水生植物；多样性；景观多样性；斑块连通性；瓯江

英文摘要： Aquatic macrophytes traditionally have been thought to be limited very little by dispersal, relative to terrestrial plants, based on the observation that many species are widely distributed. Local environmental factors and inter-specific interactions are the major forces determining species composition of aquatic plant community. A growing number of studies suggest that, at a regional scale, both the local ecological factors and regional processes such as dispersal (species pool) influenced species distribution. River networks exhibit a dendritic spatial structure that can constrain aquatic plant distribution when their dispersal is influenced by this network. Land use and hydroelectric cascade exploitation changed the connectivity between the habitat patches within river ecological system. Here, we address the relationship between local habitat factors and diversity of aquatic macrophytes of the three outflow river ecosystem in Southeast Zhejiang, and examine the effects of connectivity between habitat patches on α, β, and γ diversity of aquatic macrophytes. The aim of this research is to assess the relative importance of local habitat factors and of regional process such as dispersal for aquatic macrophyte diversity pattern, using modern GIS techniques and canonical correspondence analysis, and clarify the dri

英文关键词： Aquatic plant；diversity；landscape diversity；patch connectivity；Oujiang River