水位波动对湖滨带植物根系特征的影响及作用机制研究

长江中下游是我国淡水湖泊最为集中的区域之一。由于江湖阻隔和水电工程等，该区域大部分湖泊的自然水位波动节律均已发生改变，导致植物群落发生不同程度的改变。然而，目前国内外关于水位波动对湖泊植物的影响及作用机制研究主要集中在地上部分，地下部分却很少涉及。因此，本研究将首先在长江中下游选择不同水位波动型式的湖泊，对湖滨带植物根系进行采集，然后分析水位波动对湖滨带植物根系构件、形态、生理和生物特征的影响，建立水位波动相关参数与植物根系特征的关系模型，再进一步探讨其作用机制，并提出不同根系特征组合所需要的水位波动模式。本研究是首次采用交叉学科研究水位波动与湖泊植物根系特征的关系，相关结果不仅可为进一步分析植物根系特征对湖泊生态过程的影响奠定基础，还可为闸坝生态调度以及流域水资源管理提供科学依据。

The middle and lower reaches of the Yangtze River is one of the regions having numerous freshwater lakes in China. Due to river-lake disconnection, hydropower projects, etc., water level fluctuations (WLF) of most lakes in this region have been altered, leading to the change of plant communities in different extents. However, most studies about the effects and action mechanisms of WLF on lake plants were focused on the aboveground part, and the underground part is rarely involved. Therefore, in this research, we will first conduct field investigations of lakeshore plant roots in lakes with different WLF types, and then analyze the effects of WLF on architectural, morphological, physiological, and biotic traits of roots. Second, we will construct relational models between parameters of WLF and root traits. After that, we will explore the corresponding action mechanisms and propose WLF models to meet the requirements of root traits with different combinations. This study is the first research that using interdisciplinary sciences to analyze the relationships between WLF and root traits, and the results of this study not only can lay the foundation for further analysis of the effects of root traits on lake ecological processes, but also are useful for the ecological operation of dams and management of water resources in this basin.