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在养殖水体中,养殖动物与浮游植物的群落结构有着重要的联系,该实验通过对不同养殖密度罗非鱼养殖池塘进行了连续的采样调查,进而对浮游植物的种类、密度、生物量、多样性指数、优势种等进行了分析研究,讨论并分析了罗非鱼的密度对浮游植物群落结构的影响。罗非鱼单养池塘5次采样共鉴定出蓝藻、硅藻、裸藻、隐藻、甲藻、绿藻6门92种(包括变种)浮游植物;其中蓝藻门16种,硅藻门16种,裸藻门7种,隐藻门3种,甲藻门1种,绿藻门49种。低密度养殖浮游植物总密度在1 562.5×10~4~22 660.5×10~4cells/L之间,生物量在7.92~24.15 mg/L之间;中密度养殖浮游植物总密度在1 575×10~4~20 390×10~4cells/L之间,生物量在11.78~25.17 mg/L之间;高密度养殖浮游植物总密度在1 422.5×10~4~20 351×10~4cells/L之间,生物量在7.25~20.04 mg/L之间。不同密度组浮游植物总密度差异不显著,生物量差异不显著(P>0.05),表明在该实验密度条件下,罗非鱼密度对浮游植物的密度和生物量影响较小。高密度罗非鱼养殖池塘的浮游植物最高密度出现的时间比中密度和低密度要早,且较早达到稳定水平,表明高密度罗非鱼养殖会增大浮游植物密度增长速率,加快池塘浮游植物群落结构的演变。
In aquaculture water, there is an important relationship between the culture structure and the community structure of phytoplankton. Through the continuous sampling survey of tilapia culture ponds with different culture density, the experiment also studied the species, density, biomass, diversity of phytoplankton Sex index, dominant species and so on. The impact of the density of tilapia on phytoplankton community structure was discussed and analyzed. Five species of tilapia ponds were identified, including cyanobacteria, diatoms, eugloids, crypts, dinoflagellates and algae, and phytoplankton of 6 species including 16 species of Cyanophyta and 16 species of Bacillariophyta 7 species of Euglenophyta, 3 species of Cryptophyta, 1 species of Porphyromonas and 49 species of Chlorophyta. The total density of phytoplankton cultured in low density was between 1 562.5 × 10 4 ~ 22 660.5 × 10 4cells / L and the biomass was between 7.92 ~ 24.15 mg / L. The total density of phytoplankton in medium density culture was 1 575 × 10 ~ 4 ~ 20 ~ 390 × 10 ~ 4cells / L, and the biomass was between 11.78 ~ 25.17 mg / L. The total density of phytoplankton in high density culture ranged from 1 422.5 × 10 ~ 4 ~ 20 351 × 10 ~ 4cells / L Between the biomass of 7.25 ~ 20.04 mg / L. There was no significant difference in total density of phytoplankton among different density groups, but there was no significant difference in biomass (P> 0.05), indicating that the density of tilapia had little effect on the density and biomass of phytoplankton under the experimental density conditions. The highest density of phytoplankton in high-density tilapia culture ponds occurred earlier than medium and low density and reached a steady level earlier, indicating that high-density tilapia farming increases phytoplankton density and accelerates pond floats Evolution of Plant Community Structure.