Contrasting impacts of water diversion on bacteria community between artificial and natural routes of China's South-to-North Water Diversion Project

First comparative study of bacterial communities between artificial and natural water diversion routes of SNWDP. FL communities showed higher diversity and functional stability than PA ones. ERP exhibits higher a-diversity due to environmental heterogeneity and open system exchanges. Verrucomicrobiota and Cyanobacteria dominate in MRP, indicating niche adaptation to closed conduits. Algal biomass and TN are key drivers of bacterial succession and network structure across routes. Revealed route-specific longitudinal patterns of microbial community succession in two major engineered water transfer systems.

本研究首次针对南水北调工程（South-to-North Water Diversion Project, SNWDP）的人工与天然输水路线开展细菌群落对比研究。游离生活细菌群落（free-living bacterial community, FL）的群落多样性与功能稳定性均高于附颗粒细菌群落（particle-associated bacterial community, PA）。ERP路线因环境异质性与开放系统交换作用，其细菌群落具有更高的α多样性（alpha diversity）。疣微菌门（Verrucomicrobiota）与蓝细菌门（Cyanobacteria）在MRP路线中占据主导地位，表明其对封闭输水管道的生态位适应性。藻类生物量与总氮（total nitrogen, TN）是不同输水路线间细菌群落演替与网络结构构建的关键驱动因子。本研究揭示了两大人工输水系统中细菌群落沿路线的特异性纵向演替模式。