虎杖对水质和微生物群落结构及功能的影响

Effects of Polygonum cuspidatum on Water Quality, Structure and Function of Microbial Community

为研究虎杖种植后池塘水质变化和水体微生物群落碳源利用能力,该研究于室外构建了吉富罗非鱼养殖池塘5%虎杖生态浮床,2017年6-9月持续测定水质,利用Biolog技术分析池塘水体微生物群落结构及功能特征。结果表明6-7月生长期间虎杖种植能有效削减池塘水体中TN、TP、Chl.a浓度,在温度较高的8、9月虎杖种植塘TP显著降低(P<0.05);7-9月虎杖种植塘水体微生物AWCD值显著增加(P<0.05),多样性McIntosh和Richness(除9月)指数均显著提高(P<0.05),且水体微生物对聚合糖类、氨基酸类、醇类的代谢能力显著提高(P<0.05)。在吉富罗非鱼养殖池塘种植虎杖,可在改善水质的基础上提高水体微生物群落多样性指数及对碳源的利用能力。

To find the effects of Polygonum cuspidatum on water quality, and the carbon source utilization characteristic of microbial community, this study constructed the ecological floating bed of Polygonum cuspidatum(5% for planting area ratio)in the pond of genetically improved tilapia outside, and assessed the water quality from June to September, 2017. The structure and function of microbial community in water samples of tilapia ponds was analyzed by Biolog technology. The results showed that P. cuspidatum from June to July(during growing period) could effectively reduce the content of TN, TP, Chl.a in water samples of tilapia ponds(P<0.05), but the removal rate of TP in the water sample is not as good as those from August to September(higher temperature period, P<0.05). P. cuspidatum significantly increased AWCD values, McIntosh and Richness(except for September) indexes from July to September(P<0.05) in pond water samples, and which also improved the utilization rate of carbohydrates, amino acids, alcohols by water microbes. P. cuspidatum enhanced carbon source utilization abilities, increased diversity indexes of microbial community in water samples of aquaculture tilapia ponds, which was based on the improvement for water quality of the samples.