循环水池塘与非循环水池塘中浮游生物的群落结构及其动态研究

研究了循环水对池塘中氮、磷含量、浮游生物种群结构及其相互关系的影响。结果显示:从循环塘中共鉴定出浮游植物93种,隶属6门47属;非循环塘中共鉴定出浮游植物100种,隶属6门48属,循环塘与非循环塘均以绿藻门种类最多,分别占各塘种类总数的40.86%、42%。两塘中浮游植物的密度和生物量分别为:循环塘为247.68～1133.31(×104ind/L)和3.07～10.83 mg/L;非循环塘为511.68～1773.3(×104ind/L)和4.48～17.34 mg/L。循环塘浮游植物的密度和生物量比非循环塘要低,且差异性显著(P<0.05)。循环水鱼塘中共检出浮游动物33属42种,非循环水池塘68属88种,在试验期间两塘中浮游动物的优势种主要是由原生动物和轮虫组成,其种数变化顺序为原生动物>轮虫>枝角类和桡足类。循环塘中原生动物和轮虫分别占浮游动物总种类数的52.38%、33.34%;而非循环塘中原生动物和轮虫分别占浮游动物总种类数的42.05%、48.86%。其中循环塘72～708.11 ind/L和0.41～1.69 mg/L;非循环塘152.9～208.20 ind/L和0.26～0.46 mg/L。循环塘浮游动物的密度和生物量显著高于非循环塘(P<0.05)。循环塘与非循环塘中浮游植物的Shannon-Wiener指数分别为介于1.39～1.62和1.16～1.48之间,两塘中浮游动物的Shannon-Wiener指数分别为介于0.50～1.95和1.08～1.45之间。结果表明:循环水对养鱼池塘水体中浮游生物的出现率、丰度和生物量影响较大。

Studies on plankton community structure and its dynamics in recycling and non-recycling aquaculture ponds

An experiment was conducted to determine the influences of the recycling aquaculture pond on the concentrations of nitrogen and phosphorus,the plankton community structure and their correlations.The phytoplankton identified from the recycling aquaculture pond belonged to 93 species,47 genera,6 phyla.The phytoplankton identified from the non-recycling aquaculture pond belonged to 100 species,48 genera,6 phyla.Chlorophyta ranked first in species richness of the two ponds(40.86% and 42% of the total record tax...