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Wednesday, April 11 • 4:00pm - 4:15pm
PROCESSES IN AGRICULTURAL LANDSCAPES: Linking Land Use Pattern and Antibiotics in Soils in Typical Peri-Urban Area of China

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AUTHORS: Lei Yang*, Liding Chen, Fangkai Zhao, Shoujuan Li, Long Sun – State Key Laboratory of Urban and Regional Ecology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences

ABSTRACT: Antibiotics have been widely used in human medicine and animal husbandry, and wastewater irrigation and animal manure application in agriculture can introduce antibiotics into soils. This would threaten soil security, introduce antibiotics into food chain and emergence of antibiotic resistance genes. Identifying the relationship between land use and composition, spatial and temporal variations of antibiotics in soils can help understanding the distribution and migration processes of antibiotics in environment. This is especially important for peri-urban areas, where had complex land use pattern and high antibiotic concentrations. In this study, a typical peri-urban catchment in east China was selected. Soil samples in depth of 0-40 cm in 82 experimental sites (with different land use and geospatial locations) were collected for different seasons. The composition, quantity and seasonal dynamics of 4 main groups of antibiotics (tetracyclines, quinolones, macrolides, and sulfonamides) in soils were analyzed. Results showed that antibiotics concentrations in peri-urban soils were mainly determined by land use type. The antibiotic concentrations in cropland (0.05-395.55 µg/kg) were significantly higher than that of orchard and forestland in different seasons. The antibiotic concentrations in orchard (0.05-26.43 µg/kg) and forestland (0.07-3.65 µg/kg) had no significant differences in summer but significant differences in winter. The composition and concentration of soil antibiotics varies in different seasons, and winter had higher values than summer. The soil antibiotic concentrations and the proportion of farmland around showed a linear relationship by buffer analysis. The tetracyclines, quinolones, and sulfonamides in soils increased with increasing distance to town, distance to road, and soil C/N ratio. These indicated that most of soil antibiotic concentrations were influenced by land use pattern. Redundancy analysis show that over 60% of observed variation of soil antibiotics was explained by land use and its interactions with soil properties and bacterial communities.

Wednesday April 11, 2018 4:00pm - 4:15pm CDT
Adams Room

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