湖泊科学2025，Vol.37Issue(6)：1910-1917,8.DOI:10.18307/2025.0612
太湖藻类群落结构改变对藻源性磷浓度的影响
Influence and analysis of the shift of algae community structure on algae-derived phos-phorus concentration of Lake Taihu
摘要
Abstract
To quantitatively evaluate the concentration of algae-derived phosphorus in Lake Taihu and the influence of the algal community structure on it and to better understand the relationship between algal evolution and the internal phosphorus cycle of the lake,this study calculated the concentration of total algae-derived phosphorus in Lake Taihu and its proportion to total phosphorus in the lake based on the monitoring data and investigation data of algae and water quality of Lake Taihu from 2021 to 2023.The re-sults showed that from 2021 to 2023,the total algal density of Lake Taihu decreased from 6.3 × 107 cells/L to 4.4 × 107 cells/L(annual average value),the proportion of Microcystis decreased from 79.8％to 35.6％.On the other hand,the density and pro-portion of cryptophyta,chlorophyta and bacillariophyta increased significantly,and the whole lake's algal community changed sig-nificantly.During the same period,the total phosphorus concentration in the Lake Taihu fluctuated from 0.053 mg/L to 0.062 mg/L.The average proportion of particulate total phosphorus was 60.4％,of which the proportion of algae-derived phosphorus in particulate total phosphorus and total phosphorus was 49.4％and 29.6％,respectively,indicating that algae-derived phosphorus is an important component of particulate phosphorus.According to the further subdivision of the algal community structure,it is found that the algae-derived phosphorus in Lake Taihu is mainly contributed by three categories,including cyanophyta,bacillariophyta and chlorophyta.From 2021 to 2022,the contribution rates of cyanophyta to algae-derived phosphorus were 66.5％and 65.7％,respectively.With the rapid decrease in cyanophyta density in 2023,their contribution and proportion of algae-derived phosphorus also significantly decreased,while the contribution and proportion of algae-derived phosphorus from bacillariophyta increased from 23.9％to 56.1％.The total algae and cyanophyta density in 2023 had significantly decreased compared to 2021,but due to the increase in the proportion of bacillariophyta,chlorophyta and other categories,the increase in algae-derived phosphorus provided by them compensated for the decrease in cyanophyta algae-derived phosphorus,ultimately leading to an increase in the total algae-derived phosphorus in the entire lake instead of a decrease.Although the increase in algal density of bacillariophyta and other cate-gories is not as significant as the decrease in cyanophyta density,they have larger cell volume and higher monomeric phosphorus content,thus exhibiting a more significant compensatory effect on algal-derived phosphorus.关键词
太湖/总磷/藻类/群落结构/藻源性磷/影响Key words
Lake Taihu/total phosphorus/algae/community structure/algal-derived phosphorus/influence引用本文复制引用
杨喆,朱冰川,张军毅,戴玺铭,张虎军,许燕娟,宋挺,庄严..太湖藻类群落结构改变对藻源性磷浓度的影响[J].湖泊科学,2025,37(6):1910-1917,8.基金项目
江苏省生态环境监测科研基金项目(2302)资助. （2302）
