生态环境学报2023，Vol.32Issue(10)：1802-1810,9.DOI:10.16258/j.cnki.1674-5906.2023.10.009
围网与围塘养鱼下沉积物微生物量和群落结构特征差异
Differences of Microbial Biomass and Community Structure Characteristics in Sediments under Net-pen and Pond Fish Farming
摘要
Abstract
Sediment microorganisms play a crucial role in aquaculture ecosystems.The net-open and pond fish farming are main fish farming models in freshwater lakes along the middle and lower reaches of the Yangtze River,however,there is little knowledge about environmental differences of sediments and their effects on microbial community structure.The differences in microbial biomass and community structure indicated by phospholipid fatty acid(PLFAs)were analyzed in sediments under net-pen and pond fish farming.Correlation analysis and redundancy analysis(RDA)were used to explore the relationship between microbial biomass in sediments,community structure indexes and sediment environmental factors,and the ecological significance of sediment microbial indicators was discussed.The results showed that bacteria dominated the sediment microorganisms.The total microbial biomass,total bacterial biomass,anaerobic bacterial biomass,actinomycete biomass,and fungal biomass in seasonal flooding sediments under net-pen fish farming were significantly higher than those under pond fish farming.Moreover,the total microbial biomass,total bacterial biomass,all species bacterial biomass,and fungal biomass in perennial flooding sediments under net-pen fish farming were significantly higher than those under pond fish farming.Furthermore,the percentage of fungi in total microbes,F/B and Shannon indices,in both seasonal flooding and perennial flooding sediments under the net-pen fish farming,were significantly higher than those under pond fish farming,while the percentage of other microbial groups and G+/G-0020 showed no significant differences.The differences in physical and chemical properties of sediments such as silt,sand,organic matter,and available phosphorus,as well as the effects of antibiotic pollutants,were the main environmental factors that explained the differences in microbial biomass in sediments and community structure between the two fish farming modes.In conclusion,this study indicated that microbial biomass and community structure responded sensitively to the changes of sediment environments induced by fish farming modes.Meanwhile,the sediment ecosystem under net-pen fish farming seemed more stable than that under pond fish farming.关键词
沉积物/微生物群落结构/微生物多样性/微生物量/围网养殖/围塘养殖Key words
sediment/microbial community structure/microbial diversity/microbial biomass/net-pen fish farming/pond fish farming分类
资源环境引用本文复制引用
梁川,杨艳芳,俞姗姗,周利,张经纬,张秀娟..围网与围塘养鱼下沉积物微生物量和群落结构特征差异[J].生态环境学报,2023,32(10):1802-1810,9.基金项目
国家自然科学基金项目(41001369) （41001369）
安徽省自然科学基金项目(2108085MD126) （2108085MD126）
