中文摘要：

为描述土霉素在土壤-地下水介质中的迁移过程,采用吸附实验、微生物降解实验及土柱穿透实验对影响土霉素迁移的主要参数进行了测定研究.实验表明,土霉素在中砂、细砂、粉砂介质中吸附过程符合准一级模式,其速率常数（k1）分别为0.075、0.081和0.200 1/h.微生物降解实验表明,在中砂、细砂、粉砂的降解均为宋蓉一级降解模式,且降解速率分别为0.0124、0.0143和0.0168d-1.由穿透实验可得中砂,细砂,粉砂的渗透系数（Ks）分别为3.780 、0.660 和0.296 cm/min.弥散系数（DL）分别为2.996 、0.778和0.586 cm^2/min.表明介质对土霉素的阻滞作用依次为粉砂〉细砂〉中砂.这为进一步模拟研究土霉素在水土介质中的运移规律提供了重要的理论依据.

英文摘要：

For describing the dynamic transport of oxytetracycline in soil-groundwater medium, the batch, microbial degradation and soil column experiments were performed to investigate the main infuence parameters of transport. The results indicated that the adsorption process of medium sand, fne sand and silty sand for oxytetracycline accord with the quasi frst-order model, and the rate constants （K1） were 0.075, 0.081 and 0.200 1/h, respectively. Meanwhile,microbial degradation experiments illustrated that the degradation modes of medium sand, fine sand and silty sand for oxytetracycline fitted the first-order mode, while the degradation rates were 0.0124, 0.0143 and 0.0168d-1,respectively. Moreover,the permeability coeffcient （Ks） of medium sand, fne sand and silty sand were 3.780,0.660 and 0.296 cm/min, respectively. The diffusion coeffcients （DL） were 2.996,0.778 and 0.586 cm^2/min, respectively. It showed that the blocking ability of medium for oxytetracycline followed the order： silty sand 〉 fne sand〉 medium sand. This study provided an important theoretical basis for further simulation of the transport law of oxytetracycline in water and soil media.