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研究报告

Degradation of tetracyclines in soils and their effects on root growth of Chinese cabbages (Brassica campestris L.)

摘要：采用土培试验，分析了小白菜（Brassica campestris L.）的发芽率、生物量和根长指标对3种抗生素胁迫的敏感性，比较了不同土壤中四环素类抗生素污染对小白菜根长生长的影响，并研究了四环素类抗生素在不同土壤中的降解特性.结果表明，小白菜对3种抗生素的敏感性为根长> 发芽率> 生物量.抗生素处理土壤30 d时，4种土壤中小白菜根长对3种抗生素胁迫的敏感性均为砖红壤> 红壤> 青紫泥> 黑土；同种抗生素在4种土壤中的降解率为黑土> 青紫泥> 红壤> 砖红壤，同种土壤中3种抗生素的降解率为土霉素> 金霉素> 四环素.相关性分析发现，土壤中四环素类抗生素的含量与土壤有机质、氮磷钾含量和阳离子交换量呈显著负相关.

Abstract：Greenhouse soil culture experiments were conducted to study the degradation of tetracycline, oxytetracycline and chlortetracycline in different types of soils and subsequent effects on germination, root growth and biomass yield of Chinese cabbages (Brassica campestris L.).The results showed that root length was the most sensitive to the antibiotics, followed by seed germination and biomass yield. The effect of tetracyclines on root growth of Chinese cabbage varied among the soil types in the order of dark red soil > red soil > purplish clay soil >black soil, whereas the degradation rate of tetracyclines varied in different types of soils in the order of black soil > purplish clay soil > red soil > dark red soil. In addition, different degradation of the antibiotics in soil was noted and their degradation rate in the same types of soil changed in the order:oxytetracycline > chlortetracycline > tetracycline. There were significant negative correlations between tetracyclines residues and organic matter, and between N, P, K contents and cation exchange capacity of the soils.