摘要
对五里湖人工基质上着生藻类进行了初步研究,以期了解五里湖着生藻类群落结构生态特征并丰富该湖水生生物研究。2012年5月使用载玻片作为人工基质,采用挂片收集法对五里湖着生藻类建群模式进行为期4周的研究,同步测定水体理化指标用以分析建群过程的影响因子。结果表明:建群过程共鉴定出藻类5门35属51种,以硅藻门为优势种类,共12属26种,占总数的51.0%;第一优势种为瞳孔舟形藻(Navicula pupula),优势度Y=0.439;群落密度变化范围为4.96~23 870.63个/mm2,平均值为(10 682.47±8 365.09)个/mm^2;生物量变化范围为9.30×10^(-6)~7.10×10^(-2)mg/mm^2,平均值为(3.16±2.50)×10^(-2)mg/mm^2;两者的第1次峰值均出现在第11天。群落香农-威纳指数(H)变幅1.54~2.57、平均值2.14±0.29,均匀度指数(J)变幅0.49~1、平均值0.69±0.11,丰富度指数(D)变幅1.24~2.52、平均值1.91±0.32。多样性指数评价并结合水质分析显示,研究水域处于中度富营养水平,总体为中度污染。根据藻类群落密度和生物量的变化趋势,五里湖着生藻类群落发展过程也可划分为延迟期、指数生长期、成熟衰退期和再次生长期等4个阶段;Pearson相关性分析显示,水体理化指标中TP、TN、SD、NH_4^+-N为群落发展的主要影响因子。
Wuli Lake is an extension of Meiliang Bei, Taihu Lake in Wuxi City and is a typical shallow urban lake. In May, 2012, we conducted a four-week preliminary investigation of periphytic algae colonization in Wuli Lake u- sing glass slides as an artificial substrate. The aim of the study was to better understand ecological characteristics of the periphytic algae community and add to the research base on aquatic organisms in Wuli Lake. On clay 1 of the experiment, 100 glass slides were placed horizontally into the water at a depth of 10 -20 cm. Beginning on day 2, three glass slides were randomly collected each day and all algae on the slide was used for species identification and biomass determination. Physiochemieal parameters were measured daily in the study area and included chlorophyll- a, pH, water temperature, Secchi disk depth （SD）, permanganate index （CODMn） , total nitrogen （TN） and total phosphorus （TP）. Results were used to analyze the relationship of water parameters with the periphytic algae com- munity. A total of 51 periphytic algae species from 35 genera and 5 phyla were identified, dominated by diatoms （26 species, 12 genera and 51.0% of the total periphytic algae species）. The most dominant species was Navicula pupula, with a dominance of 0. 439. The range of periphytic algae community density was 4.96 - 23 870.63 ind/mmz with an average value of （10 682.47 ± 8 365.09 ） ind/mm2. The community biomass range was 9.30 × 10-6 -7. 10 × 10-2 mg/mm2 with the average value of （3.16 ±2.50） × 10-2 mg/mm2. The first peak in community density and in biomass occurred on day l 1. The ranges of the Shannon-Wiener index （H） , Pielou evenness index （J） and Margalef index （D） were 1.54 - 2.57, 0.49 - 1.00 and 1.24 - 2.52, with average val- ues of （2. 14 ± 0.29）, （0. 69± 0. 11 ） and （1.91 ±0.3）, respectively. Water quality in the study area was me- sotrophic and moderately polluted, as indicated by the diversity index of periphytic algae community and the wat
出处
《水生态学杂志》
CSCD
北大核心
2017年第2期57-64,共8页
Journal of Hydroecology
基金
公益性行业(农业)科研专项(201303056-02)
江苏省自然科学基金(BK2011183)
关键词
着生藻类
群落结构
环境因子
人工基质
五里湖
±× periphytic algae
community strueture
environmental factors
artificial substrate
Wuli Lake
