<b>Long-term water diversion increased nutrient resources use efficiency and community stability of phytoplankton in subtropic lake</b>

Water diversion is commonly used in managing water resources globally, but it can significantly change lake ecosystems over time. In this study, we observed a subtropical lake over seven years and found that long-term water diversion increased the biomass and diversity of phytoplankton, particularly Cyanobacteria. These changes were linked to increased nitrogen and phosphorus levels in the water. Over time, the phytoplankton community became more stable and interconnected, improving the efficiency with which they used nutrients. However, careful management is needed to prevent potential harmful impacts, such as excessive algae growth.The table (.xlsx) and the Rcodes（functions for calculating the functional diversity and doing random forest modelling） were used to support our analysis.全球范围内，调水工程（Water Diversion）常被用于水资源管理实践，但长期作用下可能会显著改变湖泊生态系统。本研究对一处亚热带湖泊开展了为期7年的监测，结果发现长期调水提升了浮游植物（Phytoplankton）的生物量与多样性，其中蓝细菌（Cyanobacteria）的响应尤为显著。上述群落变化与水体中氮、磷浓度的升高存在显著关联。随着监测时长的推移，浮游植物群落的稳定性与连通性均有所提升，进而优化了其对营养盐的利用效率。但仍需实施精细化管理，以防范潜在的不利影响，例如藻类过度增殖。本研究附带的.xlsx表格与用于计算功能多样性（Functional Diversity）、开展随机森林建模的R代码，为本次分析提供了支撑。