Abstract
Antibiotics and heavy metals have long-term potential toxicity to the environment, and their residuals in agricultural soils are receiving more and more attention. To evaluate the ecotoxicological effects of enrofloxacin and cadmium on soil enzymatic activities and microbial community structure, soil samples were exposed to individual and combined contaminants over 28 days. The results indicated that the toxic effects of enrofloxacin alone on soil enzymatic activities were relatively small and showed no concentration dependence. In contrast, significant inhibition of soil enzymatic activities was observed upon cadmium contamination by itself. Overall, the combination of two contaminants also has toxic effect on enzymatic activities; an antagonism between enrofloxacin and cadmium was observed. On 14 and 21 days, individual enrofloxacin and cadmium reduced average well color development (AWCD), Shannon, McIntosh, Simpson indices, and substrate utilization, except for Shannon, McIntosh, Simpson indices of the cadmium 0.4 mmol/kg treatment were higher than the control on 21 days. In general, combined treatments led to higher value of these microbial diversity indicators than those found under separate contamination, although there were some exceptions. With the increase in enrofloxacin concentration, the utilization of any carbon source by the microorganisms gradually decreased. In addition, the AWCD value and substrate utilization decreased as time increased. In the separate and combined contaminant treatments, the order of substrate utilization by soil microorganisms was aliphatics > amino acids > saccharides > metabolites. Thus, enrofloxacin and cadmium had a variable but generally negative influence on soil enzymatic activities and microbial community structure.
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Acknowledgements
The present study was supported by grants from the National Science and Technology Major Project of the Ministry of Science and Technology of China (Nos. 2017YFD0800703 and 2016YFD0201203); the National Natural Science Foundation of China (No. 21377075); the Natural Science Foundation of Shandong Province, China (Nos. JQ201711 and ZR2016JL029); and the Special Funds of Taishan Scholar of Shandong Province, China. We also very thank Michael L. Thompson from Iowa State University for review of this manuscript.
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Wang, L., Zhang, W., Wang, J. et al. Toxicity of enrofloxacin and cadmium alone and in combination to enzymatic activities and microbial community structure in soil. Environ Geochem Health 41, 2593–2606 (2019). https://doi.org/10.1007/s10653-019-00307-5
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DOI: https://doi.org/10.1007/s10653-019-00307-5