常德柳叶湖及其邻近地区轮虫群落结构特征与生物地球化学过程

For this project we will select Liuye Lake (key research area) and the adjacent soils and waters as field survey area. The study area represents a complex ecosystem of interconnected lakes and rivers: large-sized city lake in Changde (Liuye Lake), communicating waterway (Chuanzi River) between Liuye Lake and Yuanjiang River, and Changde City segment of Yuanjiang River. The proposed research will investigate the effects of trophic state (nutrients, organic matter), lake pollution，and input from rivers and surrounding wetlands on dynamic changes of rotifer community structure. We will further analyze geographic distribution patterns of rotifers found in Liuye Lake and the adjacent areas from the perspective of environmental changes and wetland hydrological processes (e.g. precipitation). Relationships between changes in rotifer community structure and biogeochemical processes as well as mechanisms in the lake-river complex ecosystem shall be explored on four levels: ecosystem, community structure, population and individual, cell and molecular. The proposed results will not only add to our current knowledge of rotifer diversity in benthic and planktonic environments and geochemistry in the city lake-river complex ecosystem, but also provide a scientific basis for environmental protection and sustainable utilization of Chinese urban waters.

本项目拟选择常德柳叶湖及其邻近地区作为野外调查区域，以城市大型湖泊（柳叶湖）、江湖连通水道（穿紫河）、沅江常德城市河段复合生态系统为对象，以柳叶湖作为重点研究水域，在生态系统、群落结构、种群与个体、细胞与分子4个层次，研究复合生态系统水（湖泊、河流）土（湿地土壤和河湖沉积物）环境中N、P、总有机物、新型污染物对轮虫休眠卵动态变化和轮虫群落结构的影响，描绘基于环境变化和湿地水文过程（降雨量变化等）条件下柳叶湖及其邻近地区轮虫地理分布格局，探讨城市湖泊-河流复合生态系统轮虫群落结构演变与生物地球化学过程的关系，丰富和创新城市复合水系地球化学与水土环境轮虫多样性研究，为我国城市水环境保护与可持续利用提供科学依据。

本项目以常德柳叶湖及其邻近地区作为野外调查区域，以柳叶湖、穿紫河、沅江常德城市河段连通水体复合生态系统为对象，在生态系统、群落结构、种群与个体、细胞与分子4个层次，研究复合生态系统水（湖泊、河流）土（湿地土壤和河湖沉积物）环境中N、P、COD等对轮虫休眠卵动态变化和轮虫群落结构的影响，描绘基于环境变化和空间隔离条件下轮虫地理分布格局，探讨了城市河湖复合生态系统轮虫群落结构演变与生物地球化学过程的关系。系列室内实验和野外调查研究表明：轮虫是水质评价的重要指示生物，轮虫可加快食物网中颗粒有机物营养再生利用。通过中国南部与美国东北部轮虫种复合体遗传分化研究，提出长肢多肢轮虫和广布多肢轮虫种复合体地理距离与遗传距离间的关系为不连续线性关系，海洋屏障对轮虫遗传多样性保护有重要意义。通过4年的研究，发现轮虫新种1种，新记录种12种, 发表论文18篇。上述结果丰富和创新了城市复合水系地球化学与水土环境轮虫多样性研究，为我国城市水环境保护与可持续利用提供了科学依据。