紧水滩水库浮游轮虫群落与水质生态学评价

2010年5月-2011年3月,调查了紧水滩水库(Ⅰ-Ⅵ站)浮游轮虫的群落及与水质之间的关系.共鉴定轮虫45种,污染指标种37种,其中寡污-β中污带、β中污带和β-α中污带污染指示种类分别占总指示轮虫的32.4%、35.1%和24.3%.优势种为螺形龟甲轮虫(Keratella cochlearis)、针簇多肢轮虫(Polyarthra trigla)和等刺异尾轮虫(Trichocerca stylata).轮虫群落密度变幅为4.8～542.5ind.·L^-1,平均135.7ind.·L^-1;Shannon-Wiener多样性指数H′变幅为2.60～3.65,平均3.20:Q_B/T值变幅为0.83～2.50,平均1.39.Ⅰ-Ⅱ站的群落密度和多样性指数较低,Q_B/T值较大;而Ⅲ-Ⅵ站的群落密度和多样性指数均较高,Q_B/T值较小.Q_B/T值随着水体透明度的增大而明显下降.紧水滩水库属于寡污-中污(贫-中营养型)水体,其中Ⅰ-Ⅱ站为中污(中营养型),Ⅲ-Ⅵ站为寡污-β中污(贫营养型)水体.

Community structure of Rotifera and ecological assessment of water quality in Jinshuitan Reservoir

The community structure of Rotifera and ecological assessment of water quality were studied by investigating the species composition,density seasonal dynamics,biodiversity and Q_B/T index in the sampling stationsⅠ-Ⅵof Jinshuitan Reservoir,Zhejiang. During one year study,45 species of Rotifera were found,and 37 species were pollution indicator species,of which oligo-Pmesosaprobic,β mesosaprobic andβ-amesosaprobic species accounting for 32.4%,35.1% and 24.3% of the total indicator species respectively.The dominant species were Keratella cochlearis,Polyarthra trigla and Trichocerea similis.Community density of Rotifera ranged from 4.8 to 542.5 ind·L^-1,with an average of 135.7 ind·r^-1;Shannon-Wiener index(H^T) ranged from 2.60 to 3.65,with an average of 3.20;QB/T value ranged from 0.83 to 2.50,with an average of 1.39.Rotifera density and H' value were lower,but Q_B/T value was higher in the stationsⅠ-Ⅱ than in the stations Ⅲ-Ⅵ.Q_B/T value decreased with the increasing of water transparency.Jinshuitan Reservoir was in oligo-mesosaprobic status,of which stationsⅠ-Ⅱ were mesosaprobic,while stations Ⅲ-Ⅵ were oligo-βmesosaprobic.