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揭示不同类型水体浮游植物群落网络特征的季节性差异,为水生态监测与保护提供理论依据。以三峡库区上游重庆市璧山区代表性河流(璧南河、璧北河、梅江河)、湖泊(秀湖、青龙湖)与水库(金堂水库、同心水库、盐井河水库)为对象,通过2024年四季水体理化参数监测与浮游植物群落调查,结合多样性分析、共现网络构建、Mantel检验及冗余分析,系统探究不同水体类型浮游植物群落结构差异及其驱动机制。结果表明:(1)共鉴定浮游植物8门84属210种,以蓝藻门、绿藻门和硅藻门为主,夏季物种数最多(134种);湖库呈典型蓝藻型水体,夏季优势种拉氏拟柱孢藻(Raphidiopsis raciborskii)密度达水华阈值(>107个/L)。(2)河流浮游植物α多样性(香农指数)显著高于湖库(春、夏季,P<0.05),β多样性分析显示湖库群落异质性更强(夏、秋季显著高于河流)。(3)共现网络分析表明:除冬季外,河流网络节点与边数量更多、复杂性更高;湖库网络平均加权度、图密度及鲁棒性显著优于河流,稳定性更强。(4)环境驱动机制差异显著:夏、秋季湖库浮游植物群落受环境因子影响显著(Mantel R = 0.624-0.515),冬季河流群落受环境因子调控较弱(R = 0.461)。
Abstract:This study focuses on representative rivers (Binan River, Beibei River, Meijiang River), lakes (Xiuhu Lake, Qinglonghu Lake), and reservoirs (Jintang Reservoir, Tongxin Reservoir, Yanjinghe Reservoir) in the upper reaches of the Three Gorges Reservoir area, located in Bishan District, Chongqing. Through seasonal monitoring of water physicochemical parameters and phytoplankton community surveys conducted in 2024, combined with diversity analysis, co-occurrence network construction, Mantel tests, and redundancy analysis, we systematically investigate the differences in phytoplankton community structures across different water body types and their driving mechanisms. Key findings include:(1) A total of 210 phytoplankton species (84 genera, 8 phyla) were identified, dominated by Cyanobacteria, Chlorophyta, and Bacillariophyta. Species richness peaked in summer (134 species). Lake-reservoirs exhibited cyanobacteria-dominant assemblages, with the invasive species Raphidiopsis raciborskii exceeding bloom thresholds (>107 cells/L) in summer.(2) Riverine phytoplankton showed significantly higher α-diversity (Shannon index) than lake-reservoirs in spring and summer (p<0.05). β-Diversity analysis indicated greater community heterogeneity in lake-reservoirs, significantly exceeding rivers in summer and autumn.(3) Co-occurrence networks revealed higher complexity (node/link numbers) in rivers than lake-reservoirs except winter. Conversely, lake-reservoirs demonstrated superior network stability, evidenced by higher average weighted degree, graph density, and robustness.(4) Environmental driving mechanisms exhibited significant variations: Phytoplankton communities in lakes and reservoirs were strongly influenced by environmental factors during summer and autumn (Mantel R = 0.624-0.515), whereas the influence of environmental factors on riverine communities was weaker in winter (R = 0.461). This study reveals significant divergence in diversity, network stability, and environmental responses between phytoplankton communities in lotic (river) and lentic (lake/reservoir) ecosystems. These findings provide a theoretical basis for aquatic ecological monitoring and conservation efforts in the Three Gorges Reservoir area.
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基本信息:
DOI:10.15928/j.1674-3075.202508200001
中图分类号:Q948.8
引用信息:
[1]张翔,康元昊,赵腾,等.不同类型水体浮游植物群落网络特征的季节性差异及影响因素[J].水生态学杂志().DOI:10.15928/j.1674-3075.202508200001.
基金信息:
国家自然科学基金(42477057)
2026-09-15
2026-09-15
2026-09-15