天津市城郊不同土地利用类型土壤中抗生素分布特征及影响因素分析

选取了天津市城郊8 个不同土地利用类型土壤(包括旱地、公园、林地、滩涂、水浇地、绿化带、居民区、荒地),共48 个样本点,对天津不同土地利用类型土壤中抗生素含量、组成、分布特征及其影响因素进行研究.采用超高效液相色谱-质谱联用法(HPLC-MS/MS)检测了5 类12 种抗生素的残留水平,同时结合其土壤理化性质及微生物...

DISTRIBUTION CHARACTERISTICS AND INFLUENCING FACTORS OF ANTIBIOTICS IN SOILS OF DIFFERENT LAND USE TYPES IN SUBURBS OF TIANJIN

In this study, a total of 48 sample sites were selected from eight soils with different land use types (including dry land, park, woodland, beach, irrigated land, green belt, residential area and wasteland) in suburban areas of Tianjin, to study the content, composition, distribution characteristics and influencing factors of antibiotics in the soil in Tianjin. Ultra-high performance liquid chromatography-tandem mass spectrometry (HPLC-MS/MS) method was used to detect the residual levels of 12 antibiotics in five categories. Meanwhile, the key factors affecting the pollution characteristics of antibiotics were analyzed by the physical and chemical properties of the soil and microbial community structure. The results showed that the concentration of antibiotics was detected in the range of (4.35~1.35)×103 μg/kg, in the general sequence of tetracyclines (TCs)>sulfonamides (SAs)>quinolones (QNs)>macrolides (MLs)>β-lactams, in which antibiotic content in dry land soil was significantly higher than the other soil, mainly related to organic fertilizer application. Principal component analysis (PCA) showed that the composition of antibiotics in the soil of the dry land and park was significantly different from the others, which was related to fertilization of livestock and poultry manure and the release of antibiotics in exogenous life. Redundant analysis (RDA) of environmental factors and antibiotics showed that soil environmental factors (total nitrogen (TN), total phosphorus (TP), copper (Cu), zinc (Zn), pH) had a strong influence on the composition of antibiotics (P<0.05). Spearman correlation between microorganisms and antibiotics showed that Planctomyce, Sphingomonas, Gemmatimona, Roseiflexus, Steroidobacter, Acidobacteria_bacterium_WX27, Lysobacter, Thiobacillus had significant correlations with antibiotics (P<0.05). Among them, microorganisms were strongly related to tetracycline and quinolone antibiotics. This study could provide a scientific basis for the prevention and control of soil antibiotic pollution.