珠江口浮游植物群落结构特征及其环境影响因子分析

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中图分类号：P734.4，X17 文献标志码：A 文章编号：1004—6755（2025）12—0039—05

Analysis of phytoplankton community structure and environmental influencing factors in the Pearl River Estuary

LU Yan，CHEN Yibin，LI Mingang （Guangdong Yunan Testing Technology Co.，LTD.，Guangzhou 5ll47o，China）

Abstract：The Pearl River Estuary is a region with frequent human activities. To understand the characteristics of the phytoplankton community structure and their relationship with environmental factors，an investigation was conducted in the waters of the Pearl River Estuary in November 2O23 and April 2024.The results showed that in November 2023，a total of 86 species belonging to 53 genera and 7 phyla were identified，among which Bacillarophyta comprised 54 species，accounting for 62.79% ，and Chlorophyta comprised 16 species，accounting for 18.60% . In April 2024，a total of 95 species belonging to 56 genera and 7 phyla were identified，among which Chlorophyta comprised 34 species，accounting for 35.79% ，and Bacillarophyta comprised 33 species，accounting for 34.74% . The findings from both surveys indicated that Bacillarophyta had the highest abundance，with 1.38×106 cells/ m3 in November 2023 and 2.68×106 cells/ 'm3 in April 2024. Non一metric Multidimensional Scaling（NMDS） analysis revealed that the phytoplankton communities in both surveys were classified into two groups： Group A（brackish water and euryhaline species）and Group B（euryhaline and salt一tolerant species）.Analysis of dominant species showed that there were 5 dominant species in November 2023 and 6 in April 2O24.Pearson correlation analysis between phytoplankton cel abundance and environmental factors indicated that only in November 2023 did phytoplankton show a positive correlation with ammonia nitrogen，while the correlations between silicates and phosphates with phytoplankton abundance were not significant.

Key words：Pearl River Estuary;phytoplankton;community structure

浮游植物作为海洋中的初级生产者，其群落结构能反映生态系统的复杂性和健康性，是海洋生态系统监测的重要指标[1]。（剩余5568字）