湖泊科学2025，Vol.37Issue(6)：1926-1937,12.DOI:10.18307/2025.0614
城市河流近自然修复过程中附着藻类群落恢复与环境驱动机制
Recovery and environmental driving mechanisms of attached algae communities during the near-natural restoration of urban rivers
摘要
Abstract
The study of attached algae communities' assembly mechanisms is essential for understanding the restoration of river eco-system structure and function.This study analyzed attached algae communities in three representative rivers flowing through Guang-zhou-Chebei River(natural habitat),Liede River(highly canalized),and Shahe River(mixed habitat)—that are subject to a low water level operation strategy.The analysis covered four consecutive flood seasons from 2020 to 2023,focusing on the recovery and environmental drivers of these communities under near-natural restoration measures.The results showed that 193 algal species across 6 phyla,53 families,and 90 genera were recorded,with Bacillariophyta being dominant(51.26％).No significant spatial differences in algal standing stocks were found,while significant annual differences occurred,indicating higher temporal than spa-tial heterogeneity.Chebei River had the highest total number of species(184),while Liede River showed the highest abundance(2.17×109 cells/m2),biomass(3.16×103 mg/m2),Shannon diversity index(3.14),and Evenness index(0.66).Annually,Liede River had the largest increases in species and Shannon diversity index(41.43％and 15.58％,respectively),and Shahe River had the highest abundance and biomass increase(92.62％and 96.53％,respectively),with Evenness index remaining sta-ble at around 0.6.These findings highlighted the effectiveness of near-natural restoration for attached algae recovery.Niche breadth and overlap analysis indicated that the attached algal communities in the studied rivers maintained overall stable niche breadth,with niche overlap between most species being below the competition threshold(0.6).These results reflect high re-source-use efficiency,low interspecific competition pressure,and a relatively stable state of the community.The standardized ran-dom rate analysis revealed that either deterministic or stochastic processes could dominate the restoration process,and their relative contributions were regulated by environmental heterogeneity.Redundancy analysis further identified that total nitrogen,total phos-phorus,dissolved oxygen,water depth and flow velocity are key factors affecting the rivers attached algae communities.The find-ings provide empirical support and a scientific basis for the effective implementation of near-natural restoration in urban river chan-nels.关键词
城市河流/低水位运行/附着藻类恢复/群落构建/时空异质性/环境因子Key words
Urban rivers/low water level operation/attached algae restoration/community construction/spatiotemporal heteroge-neity/environmental factors引用本文复制引用
莫露清,李明,禤倩红,朱文玲,周新民,黄家俊,杨扬,邰义萍,戴玉女,陶然,张晓萌,余佰伦,张杰,区廷哲..城市河流近自然修复过程中附着藻类群落恢复与环境驱动机制[J].湖泊科学,2025,37(6):1926-1937,12.基金项目
广州市水务科技创新项目(GZSWKJ2022-004,GZSWKJ2023-003,440101-2021-10693)、广东省自然科学基金项目(2023A1515030019)、广东省国际科技合作基地项目(2019A050505005)、广州市科技计划项目(2024B03J1230)和国家重点实验室水灾害防治专项基金"一带一路"专项(2022491511)联合资助. （GZSWKJ2022-004,GZSWKJ2023-003,440101-2021-10693）
