典型生物滞留池细菌群落结构及多样性特征

为了解生物滞留池的细菌群落多样性特征,选取珠海市3个典型生物滞留池为样点,采集19个土壤样本,基于16S rRNA基因高通量测序技术,分析了生物滞留池的细菌群落结构及多样性,探讨了细菌群落与土壤因子的关系及生态功能。结果表明：珠海市生物滞留池的优势菌门(相对丰度>5%)为变形菌门(Proteobacteria)、绿弯菌门(Chloroflexi)、放线菌门(Actinobacteria)、酸杆菌门(Acidobacteria),还含有大量厚壁菌门(Firmicutes)、芽单胞菌门(Gemmatimonadetes)、硝化螺旋菌门(Nitrospirae)、拟杆菌门(Bacteroidetes)、糖化细菌门(Saccharibacteria)、蓝菌门(Cyanobacteria)、浮霉菌门(Planctomycetes)等细菌群落。生物滞留池细菌群落的多样性和丰富度较高,细菌群落结构受生物滞留池中植被类型的影响显著,受土壤深度的影响不显著。土壤因子分析发现,总有机碳(TOC)、总硫(TS)、总氮(TN)、铵氮(NH⁺₄-N)和硝酸盐氮(...

BACTERIAL COMMUNITY STRUCTURE AND DIVERSITY OF TYPICAL BIORETENTION SYSTEMS

Bioretention system is a green infrastructure which takes advantage of the physical, chemical and biological characteristics of microorganisms and vegetation to regulate the quality and quantity of surface runoff. The bacterial community has a profound influence on the ecological functions of bioretention systems. At present, there are few studies focusing on the structure and diversity of the bacterial community in typical bioretention systems. Nineteen soil samples were collected from three typical bioretention systems in Zhuhai, the structure and diversity of the bacteria community were investigated based on 16S rRNA gene high-throughput sequencing technology, and the relationship between bacterial community and soil environmental factors was discussed, also the predicted ecological functions. The dominant phyla (relative abundance>5%) in three typical bioretention systems were Proteobacteria, Chloroflex, Actinomycetes and Acidobacteria, while the community also contained abundant Firmicutes, Gemmatimonadetes, Nitrospirae, Bacteroidete, Saccharibacteria, Cyanobacteria and Planctomycetes. The diversity and abundance of the bacterial community were relatively high, and the structure of the bacterial community was mainly affected by the vegetation type rather than soil depth. Results indicated that the effects of total organic carbon (TOC), total sulfur (TS), total nitrogen (TN), ammonium-nitrogen (NH₄+-N) and nitrate-nitrogen (NO₃--N) on bacterial community were strong, while those of pH and nitrite-nitrogen (NO₂--N) were weak. The relative abundance of Proteobacteria was negatively correlated with NH₄+-N and NO₃--N contents, Cloroflexi negatively correlated with TOC and TN, Nitrospirae positively correlated with pH and NO₂--N, Bacteroides negatively correlated with NO₃--N, and Plantomycetes negatively correlated with NH₄+-N. The bacterial community had a relatively complete set of basic ecological functions, including amino acid transport and metabolism, energy production and conversion, signal transduction mechanisms, inorganic ion transport and metabolism, cell wall/membrane/envelope biogenesis, transcription, carbohydrate transport and metabolism, etc.