钤阳湖浮游植物群落动态及其驱动因素研究

Study on phytoplankton community dynamics and its driving factors in Qianyang Lake

钤阳湖是江西省新余市重要的饮用水水源地,目前面临着水华爆发风险.该文基于2022年1月、5月和7月对钤阳湖浮游植物和水环境的调查,研究钤阳湖不同水文时期浮游植物群落结构演替规律及其与环境因子之间的关系.共检出浮游植物7门58种,其中绿藻门23种,占总种数的39.66%,是钤阳湖浮游植物的优势类群.隐藻门中的隐藻(Cryptomonas sp.)是枯水期和平水期的优势属(种),蓝藻门中的鱼腥藻(Anabaena sp.)是丰水期的优势种.浮游植物密度表现出丰水期高、枯水期次之、平水期最低的规律.冗余分析和逐步多元回归分析表明,水温、pH值、氨氮等是影响钤阳湖浮游植物动态的主要环境因子.

The Qianyang Lake is a vital water source for Xinyu City in Jiangxi Province,and is currently experiencing algal blooms.In order to study the succession of phytoplankton community structure and its relationship with environmental factors in different hydrological periods of Qianyang Lake,the phytoplankton community and water environment of Qianyang Lake were monitored in January,May and July 2022.A total of 58 species of phytoplankton were identified,belonging to 8 phyla,with 23 species from Chlorophyta accounting for 39.66%of the total species,and being the dominant group of phytoplankton in Qianyang Lake.Cryptomonas sp.is the dominant genus(species)in dry season and normal water-level season,while Anabaena sp.is the dominant genus(species)in wet season.The density of phytoplankton was highest in the wet season,followed by the dry season,and lowest in normal water-level season.RDA and stepwise multiple regression analysis indicated that water temperature,pH,ammonia nitrogen were the main environmental factors affecting the dynamics of phytoplankton in Qianyang Lake.