| 摘要: |
| 浮游植物是水体的初级生产者，可以指示环境变化。高原水库由于其蒸发量大、雨季短、旱季长、抗污染能力差的特点，导致其生态系统脆弱，因此其中浮游植物群落的变化能对环境条件更为敏感。为了解云贵高原地区乌江渡水库浮游植物的群落结构和演替特征，于2021年6月至2022年5月对乌江渡水库浮游植物群落进行调查，并应用功能群的方法对浮游植物进行分类。结果发现：1)2021年6月—2022年5月乌江渡水库表层水体浮游植物群落共鉴定浮游植物106种，共8门67属，其中，生物量最高的为硅藻门，种类数最多的为绿藻门；2)乌江渡水库表层水体理化性质和浮游植物群落存在显著的季节性差异，而相同季节内不同位置差异不显著；3)乌江渡水库表层水体春夏秋季为中-轻度富营养状态，而冬季为中营养状态；4)乌江渡水库中共有浮游植物群落功能群24类，基于优势度，其季节性演替模式为B/C/L0/P(春季)->B/J/L0/P/S1/T(夏季)->B/L0/P/S1/T(秋季)->B/P(冬季)，春季和秋季优势功能群关联显著，而夏季和冬季优势功能群关联不显著，相对独立，即浮游植物群落演替伴随着群落稳定性的变化；5)氮磷营养盐、温度和溶解氧是影响乌江渡水库表层浮游植物群落的关键环境因子。本研究提供了云贵高原地区典型高原水体中浮游植物群落结构的背景信息，并从功能群的角度分析了群落的特征及其主要影响因子。 |
| 关键词: 浮游植物,功能群,多样性,优势度,乌江渡水库 |
| DOI： |
| 分类号: |
| 基金项目:贵州省科技计划项目（黔科合基础[2020]1Y072，贵州省高层次留学人才创新创业择优资助项目（2020）09号 |
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| Seasonal dynamics of phytoplankton community and their relationship with environmental factors in Wujiangdu Reservoir, Yungui Plateau |
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Fan Zhou1, Chen Chen1, Xu Tao2, Yang Yang1
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1.School of Life Sciences,Guizhou Normal University;2.School of Guizhou Emergence Management,Guizhou Normal University
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| Abstract: |
| Phytoplankton are the primary producers in the water column which could indicate environmental changes. The aquatic ecosystems of plateau reservoirs are fragile due to the large evaporation, short rainy season, long dry season and weak resistance to pollutions. Therefore, the dynamics of phytoplankton communities are more sensitive to environmental conditions. In order to reveal the community structure and succession characteristics of phytoplankton in Wujiangdu Reservoir in Yunnan-Guizhou Plateau, we investigated phytoplankton community in Wujiangdu Reservoir from June 2021 to May 2022, and classify the phytoplankton to functional groups. Results showed that: 1) A total of 106 species/taxa of phytoplankton were identified in the surface water of Wujiangdu Reservoir, belonging to 8 phyla and 67 genera. Bacillariophyta had the greatest biomass, and Chlorophyta had the most abundant species richness. 2) there were significant seasonal differences in physical and chemical properties and phytoplankton communities in the surface water of Wujiangdu Reservoir, but the spatial heterogeneity, referring to different sites in the same season, was in-significant. 3) the surface water of Wujiangdu Reservoir was mesotrophic to moderately eutrophic in spring, summer and autumn, and was mesotrophic in winter. 4) there were 24 functional groups of phytoplankton communities identified in Wujiangdu Reservoir. Based on dominance, the seasonal dynamic pattern was B/C/L0/P (spring)-> B/J/L0/P/S1/T (summer)-> B/L0/P/S1/T (autumn)-> B and P (winter). The correlations between the dominant functional groups in spring and autumn were significant, while in-significant in summer and winter, indicating their relative independence. Therefore, the seasonal dynamics of phytoplankton community is accompanied with the changes of community stability. 5) nitrogen and phosphorus nutrients, temperature and dissolved oxygen are the key environmental factors affecting the phytoplankton community in Wujiangdu Reservoir. This study provided the background information of phytoplankton community structure in a typical plateau reservoir of Yungui Plateau, described the characteristics and analyzed the primary factors for the seasonal dynamics. |
| Key words: phytoplankton, functional groups, diversity, dominance, Wujiangdu reservoir |
