襄阳汉江国家湿地公园浮游植物群落结构特征及其影响因素

Characteristics of phytoplankton community and their influencing factors in Xiangyang Hanjiang national wetland park

为分析襄阳汉江国家湿地公园不同水文期浮游植物群落结构特征及其影响因素,于2021年3月(枯水期)和6月(丰水期)设置16个样点进行采样调查.共鉴定浮游植物8门61属75种,丰水期和枯水期均以硅藻门为主.浮游植物物种丰富度、香浓-维纳指数和均匀性指数在不同水文期之间的差异均显著(P<0.05),丰水期高于枯水期;不同水文期浮游植物群落组成差异极显著(P<0.01).Mantel检验显示:高锰酸盐指数、水温、碳含量是影响枯水期浮游植物群落结构的主要环境因素,氮含量、正磷酸盐、水温、透明度是驱动丰水期浮游植物群落时空分布的主要因素.

In order to clarify the characteristics and influencing factors of phytoplankton community structure during different hydrological periods,the survey was conducted at sixteen typical sampling sites of Xiangyang Hanjiang national wetland park in March(dry season)and June(wet season)of 2021.A total of 75 phytoplankton species were identified,belonging to 8 phyla and 61 genera.Bacillariophyta dominated in wet and dry seasons.The species richness,shannon-wiener index and evenness index of the phytoplankton community showed significant differences during different hydrological periods(P0.05),and the community structure of phytoplankton has significant differences during different hydrological periods(P0.01).Mantel test analysis indicated that water temperature,permanganate index,carbon content were key factors affecting the community structure of phytoplankton dry season,whereas nitrogen content,orthophosphate,water temperature,transparency were key factors affecting the community structure of plankton during wet season.