ABSTRACT The objectives of this study were to investigate the effect of soil organic matter content on the accumulation of veterinary antibiotics in pepper (Capsicum annuum L.) and the effect of antibiotic concentrations on culturable soil-borne bacteria. Soils containing 0%, 5%, or 10% (vol/vol) organic matter content were prepared using coir dust. Four veterinary antibiotics: sulfamethoxazole, sulfamethazine (sulfonamide series), oxytetracycline, and chlortetracycline (tetracycline series), commonly used in Korea were selected for this study. Antibiotic mixtures of equal amount of each antibiotic were used to spike the soil to achieve concentrations of 0, 1, 5, and 10 mg kg−1, respectively. Pepper cultivated for 2 weeks after sowing was transplanted into pots filled with soil treated with organic matter and antibiotics. After 8 weeks, pepper roots, leaves, and fruits were harvested, and antibiotic concentrations in the soil and pepper plants were analyzed. Concentrations of the tetracycline series in soil were higher than those of the sulfonamide series. The amount of sulfonamide series antibiotics transferred to pepper roots increased with increasing organic matter content in the soil, whereas no significant difference was observed in oxytetracycline and chlortetracycline concentrations in roots. Under all organic matter treatments, the microbial activity in soil decreased when antibiotic concentrations increased. For a given antibiotic concentration, the number of culturable soil-borne bacteria increased as the organic matter content increased.

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土壤有机质含量对辣椒吸收四种兽用抗生素的影响

摘要 本研究的目的是研究土壤有机质含量对辣椒（Capsicum annuum L.）中兽用抗生素积累的影响以及抗生素浓度对可培养土传细菌的影响。使用椰壳粉制备含有 0%、5% 或 10%（体积/体积）有机质含量的土壤。本研究选择了韩国常用的四种兽用抗生素：磺胺甲恶唑、磺胺二甲嘧啶（磺胺系列）、土霉素和金霉素（四环素系列）。将每种抗生素等量的抗生素混合物用于掺入土壤，分别达到 0、1、5 和 10 mg kg-1 的浓度。播种后种植 2 周的辣椒被移植到装满用有机物和抗生素处理过的土壤的盆中。8周后，收获辣椒的根、叶和果实，并分析土壤和辣椒植物中的抗生素浓度。土壤中四环素系列的浓度高于磺胺系列。转移到辣椒根部的磺胺类抗生素的量随着土壤有机质含量的增加而增加，而根中土霉素和金霉素浓度没有显着差异。在所有有机质处理下，当抗生素浓度增加时，土壤中的微生物活性降低。对于给定的抗生素浓度，可培养的土传细菌的数量随着有机质含量的增加而增加。土壤中四环素系列的浓度高于磺胺系列。转移到辣椒根部的磺胺类抗生素的量随着土壤有机质含量的增加而增加，而根中土霉素和金霉素浓度没有显着差异。在所有有机质处理下，当抗生素浓度增加时，土壤中的微生物活性降低。对于给定的抗生素浓度，可培养的土传细菌的数量随着有机质含量的增加而增加。土壤中四环素系列的浓度高于磺胺系列。转移到辣椒根部的磺胺类抗生素的量随着土壤有机质含量的增加而增加，而根中土霉素和金霉素浓度没有显着差异。在所有有机质处理下，当抗生素浓度增加时，土壤中的微生物活性降低。对于给定的抗生素浓度，可培养的土传细菌的数量随着有机质含量的增加而增加。而在根中土霉素和金霉素的浓度没有观察到显着差异。在所有有机质处理下，当抗生素浓度增加时，土壤中的微生物活性降低。对于给定的抗生素浓度，可培养的土传细菌的数量随着有机质含量的增加而增加。而在根中土霉素和金霉素的浓度没有观察到显着差异。在所有有机质处理下，当抗生素浓度增加时，土壤中的微生物活性降低。对于给定的抗生素浓度，可培养的土传细菌的数量随着有机质含量的增加而增加。