摘要
南亚热带中小型水库是城市重要的水源地和后备水源地.为了解南亚热带地区中小型水库蓝藻的分布情况,于2011年7月（丰水期）和2012年3月（枯水期）调查了该地区25座中小型水库,分析了水库的蓝藻种类组成与群落季节动态特征.25座水库的总氮（TN）浓度范围为0.51-9.37 mg/L;总磷（TP）浓度范围为0.01-0.72 mg/L,富营养水体占80%.本次调查共检出蓝藻20属,蓝纤维藻、泽丝藻、假鱼腥藻和拟柱孢藻为优势丝状蓝藻,细小平列藻、色球藻、粘球藻和隐杆藻为优势球形蓝藻,其中泽丝藻为绝对优势属.丰水期蓝藻生物量为3.19（±4.87）mg/L,枯水期为0.83（±1.06）mg/L,丝状蓝藻全年占优.多元方差分析（MANOVA）表明蓝藻群落季节差异显著（P〈0.05）,方差分析（ANOVA）显示枯水期蓝藻及丝状蓝藻生物量显著低于丰水期（P〈0.05）,球形蓝藻生物量季节变化不明显.多元回归分析表明,丰水期透明度是影响蓝藻生物量的重要原因,枯水期则为TP与pH;冗余分析表明温度、透明度、硝氮与电导率为蓝藻群落季节差异的重要解释变量,其中电导率为丰水期蓝藻分布的重要解释变量;电导率与硝氮为枯水期重要解释变量.整体而言,中小型水库丰水期高温和高营养盐是蓝藻生物量相对较高的主要原因,但由于水体扰动剧烈,导致丝状蓝藻占据优势;温度降低是枯水期蓝藻生物量降低的重要原因.
Small-and medium-sized reservoirs are important water sources in the subtropical zone of southern China. Cyanobacterial species dominate throughout the year in most reservoirs in or around cities. In order to investigate the cyanobacterial community structure and seasonal variation of these reservoirs, physical-chemical parameters, nutrients, biomass, and abundance of cyanobacteria were investigated in twenty-five reservoirs in Dongguan city in July 2011（flood season） and March 2012（dry season）. The results showed that total nitrogen（TN） and total phosphorus（TP） ranged from 0.51 to 9.37 mg/L and 0.01 to 0.72 mg/L, respectively. Eighty percent of these reservoirs were in a eutrophic status. During the observation period, 20 genera of cyanobacteria were observed. Dactylococcopsis, Limnothrix, Pseudanabaena, and Cylindrospermopsis were common filamentous cyanobacteria genera, and Merismopedia, Chroococcus, Gloeocapsa, and Aphanothece were common spherical cyanobacteria; Limnothrix was the predominant genus. Cyanobacterial biomass was 0.19（± 4.87） mg/L in the flood season and 0.83（± 1.06） mg/L in the dry season. Filamentous cyanobacteria dominated throughout the year. A MANOVA showed that there was significant seasonal variation in the cyanobacterial community（P〈0.05）; meanwhile, the cyanobacterial biomass and filamentous cyanobacterial biomass in the dry season were significantly lower than they were in the flood season（P〈0.05, ANOVA）. The multivariate regression analysis showed that transparency in the flood season and TP and pH in the dry season were the important explanatory variables for the seasonal variation of cyanobacterial biomass. A redundancy analysis indicated that temperature, transparency, NO_3^-, and conductivity were important explanatory variables for seasonal variation in cyanobacterial biomass and that conductivity was an important explanatory variable for the f lood season and NO3-and conductivity for the dry season. High temperatures and nutrient concentrati
作者
陈飞
唐鹊辉
肖利娟
彭亮
林小涛
CHEN Fei;TANG Quehui;XIAO Lijuan;PENG Liang;LIN Xiaotao(Institute of Hydrobiology, Jinan University, Guangzhou 510632, China)
出处
《应用与环境生物学报》
CAS
CSCD
北大核心
2018年第3期595-601,共7页
Chinese Journal of Applied and Environmental Biology
基金
国家自然科学基金项目(41403061)
广东省水利科技创新项目(2016-29)资助~~
关键词
南亚热带
中小型水库
蓝藻
种类组成
群落动态
季节动态
southern China
small and medium-sized reservoirs
cyanobacteria
species composition
community dynamics
season dynamics
