| 南水北调西线水源区着生藻类群落特征及驱动因子 |
| 摘要点击 280 全文点击 7 投稿时间：2025-07-05 修订日期：2025-10-25 |
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| 中文关键词 着生藻 群落结构 环境因子 河流健康 南水北调西线工程 |
| 英文关键词 periphytic algae community structure environmental factors river health Western Route of the South-to-North Water Diversion Project |
| DOI 10.13227/j.hjkx.202507067 |
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| 中文摘要 |
| 为探究南水北调西线水源区着生藻类群落结构特征及其驱动因子，于2022年7月至2024年5月在12个典型断面开展了5期着生藻类采样调查，共鉴定出着生藻类6门60属172种，硅藻为优势类群. 群落结构分析表明，该群落在空间分布上未呈现显著异质性，但在时间动态上表现复杂. 在年内尺度上，群落变动显著，主要体现为优势种的季节性演替现象. 而在年际尺度上，群落的整体结构发生了显著变化. 整合分析（RDA、随机森林、SEM和Mantel）揭示了着生藻类群落“双路径”调控机制：群落的总丰度（生物量）主要受流速（V）和pH等物理化学因子的协同限制；而群落的物种构成则直接受控于总氮（TN）、总磷（TP）等营养盐动态所驱动的资源竞争. 研究结果可为调水可行性、水源区河流健康动态评估及生态系统保护提供基础数据和科学依据，具有重要生态环境管理意义. |
| 英文摘要 |
| To investigate the community structure and driving factors of epilithic algae in the water source area of the Western Route of the South-to-North Water Diversion Project， five sampling surveys were conducted at 12 typical cross-sections from July 2022 to May 2024. A total of 172 species， belonging to 60 genera and 6 phyla， were identified， with diatoms （Bacillariophyta） as the dominant group. Community structure analysis indicated no significant spatial heterogeneity but complex temporal dynamics. On an intra-annual scale， the community exhibited significant variations， mainly characterized by the seasonal succession of dominant species. On an inter-annual scale， the overall community structure （or composition） underwent significant changes. Integrated analyses （RDA， Random Forest， SEM， and Mantel） revealed a “dual-pathway” regulatory mechanism for the epilithic algal community： The total abundance （biomass） was primarily co-limited by physicochemical factors such as flow velocity （V） and pH， whereas the species composition （structure） was directly controlled by resource competition driven by nutrient dynamics， such as total nitrogen （TN） and total phosphorus （TP）. These findings provide fundamental data and scientific evidence for the feasibility of the water diversion， the dynamic assessment of water source health， and ecosystem conservation， holding significant implications for ecological and environmental management. |
