Subtropical Plant Science >

2026 , Vol. 55 >Issue 2: 203 - 215

DOI: https://doi.org/10.3969/j.issn.1009-7791.2026.02.008

Research articles

Preliminary Investigation of Phytoplankton in the River Sections of Zhentouba Ⅱ and Shapingba Ⅰ Hydropower Stations in 2019

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  • (1. Zhen Sha Hydropower Construction and Management Branch, Dadu River Basin Hydropower Development Co., Ltd, China Energy, Leshan, 614000, Sichuan China; 2. Institute of Hydroecology, Ministry of Water Resources & Chinese Academy of Sciences, Wuhan 430079, Hubei China; 3. Guiyang Engineering Corporation Limited, Power China, Guiyang 550000, Guizhou China; 4. Hubei Institute of Standardization and Quality, Wuhan 430071, Hubei China)

Received date: 2025-11-29

  Accepted date: 2026-01-23

  Online published: 2026-04-30

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Abstract

To characterize the background characteristics of phytoplankton communities in the evaluation reaches prior to the construction of Zhentouba Ⅱ and Shapingba Ⅰ Hydropower Stations on the Dadu River, and to provide a comparative basis for the retrospective ecological evaluation after the stations completed, a systematic investigation of phytoplankton was conducted in July (summer) and October (autumn) in 2019. The study covered an 87.5 km mainstream section from Shenxigou to Gongzui and major tributaries, with 18 sampling stations established. Qualitative and quantitative collection of phytoplankton was carried out, and environmental factors were measured simultaneously. Multivariate statistical methods including Principal Coordinates Analysis (PCoA), multi-response permutation procedures (MRPP), and Distance-based Redundancy Analysis (dB-RDA) were used to analyze the community structure and influencing factors. The results showed that a total of 148 phytoplankton species belonging to 7 phyla and 68 genera were detected in the evaluation area, dominated by Bacillariophyta (76 species, accounting for 51.35%), Chlorophyta (47 species, 31.76%), and Cyanophyta (16 species, 10.81%). The community structure exhibited significant seasonal heterogeneity (P＜0.001): the number of species in summer (43 species) was significantly less than that in autumn (124 species), while the average density (5.39×105 cells·L–1) was an order of magnitude higher than that in autumn (6.34×104 cells·L–1). Spatially, the phytoplankton abundance in the mainstream (7.03×105 cells·L–1) was higher than that in the tributaries (3.55×105 cells·L–1) in summer, whereas the tributaries (7.56×104 cells·L–1) had higher abundance than the mainstream (5.36×104 cells·L–1) in autumn. The dominant species showed seasonal succession: diatoms such as Cyclotella sp. and Achnanthes sp. dominated in summer, while the dominance of Cyanophyta and Chlorophyta increased in autumn. dB-RDA analysis revealed that water temperature was the main environmental factor driving the changes in community structure, and sediment content indirectly affected the number of phytoplankton species and abundance by regulating transparency. This study clarified the background characteristics and spatio-temporal variation patterns of phytoplankton communities in the evaluation reaches, and identified the key environmental influencing factors, providing scientific support for ecological protection and retrospective evaluation after the construction of cascade hydropower stations.

Key words： phytoplankton; Dadu River; community structure; environmental factors; cascade hydropower station

Cite this article

JIN Bo, ZHANG Zhi-ming, YANG Chang-fu, QIN Zhi-yi, LI Ming, HU Jun, CHI Shi-yun . Preliminary Investigation of Phytoplankton in the River Sections of Zhentouba Ⅱ and Shapingba Ⅰ Hydropower Stations in 2019[J]. Subtropical Plant Science, 2026 , 55(2) : 203 -215 . DOI: 10.3969/j.issn.1009-7791.2026.02.008

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