Study On Community Structure And Diversity Of Environmental Microbial In The Photovoltaic Fishery Mode

Photovoltaic fishery mode is a new production mode combining photovoltaic power generation and pond farming.Compared with the conventional pond farming mode,the photovoltaic fishery mode has the advantages of high land utilization rate,high income and the development potential of leisure tourism,and has a good development prospect.However,whether the photovoltaic modules will affect the farming environment is one of the main problems that plague the further promotion and application of the photovoltaic fishery mode.In this study,water column and sediments in conventional pond farming mode and photovoltaic fishery mode were taken as research objects,and the differences in community structure and diversity of microbial were compared,so as to reveal the influence of photovoltaic modules on the farming environment from the perspective of microorganisms,and to provide certain theoretical basis for the optimization and application promotion of photovoltaic fishery mode.The main results are as follows:In the photovoltaic fishery mode,the dominant bacteria phyla in the water column were Cyanobacteria,Actinobacteria,Proteobacteria,Bacteroidetes,and Verrucomicrobia.The dominant bacteria genus were Planktothrix,hgcl_clade,CL500-29_marine_group,Polynucleobacter,and Planktothricoide.Moreover,there was a core microflora composed of Cyanobacteria,Betaproteobacteria,and Actinobacteria that was not affected by the photovoltaic modules.Diversity analysis showed that there was no significant difference in the composition and abundance of dominant bacteria in water column between conventional ponds and the photovoltaic fishery mode.However,the beneficial microorganism content was decreased in the photovoltaic fishery mode.In addition,the pathogenic bacteria content was also increased,which would increase the risk of disease in aquaculture.The results also showed that the photovoltaic modules with a coverage rate of 50% affected the low-abundance flora,resulting in a decrease in the microbial diversity and abundance in the water column.This might also explain the significant increase in the abundance of bacterioplankton,as well as the decrease in the concentration of dissolved oxygen and nitrogen and phosphorus compounds in the watercolumn.In the photovoltaic fishery mode,the dominant bacteria phyla in the sediments were Proteobacteria,Chloroflexi,Acidobacteria,Nitrospirae,and Bacteroidetes.The dominant bacteria genus were Nitrospira,Geobacter,Roseiflexus,H16,and Anaeromyxobacter.There was no significant difference in the composition and abundance of dominant bacteria in sediments between conventional ponds and the photovoltaic fishery mode.The results also showed that the photovoltaic modules with a coverage rate of 50%mainly affected the low-abundance flora,resulting in a significantly increase in the microbial diversity and abundance in the sediments.This might also explain the significant increase in the abundance of Planktothricoides and Planktothrix,as well as the increase in the pH value and the concentration of nitrogen and phosphorus compounds in the sediments.