Zhang Jian, Guan Lian-Zhu, Yan Li
College of Resources and Environment, Shanxi Agricultural University, Taegu 030801, China.
Huan Jing Ke Xue. 2012 Jan;33(1):323-8.
Simulated indoor incubation experiment was carried out to explore the degradation dynamics of oxytetracycline (OTC) from different manures and the mechanisms were investigated as well. The results suggested that manures accelerated OTC entering soil and degrading period, and resembled the L-type curves. Both degradation rate and degradation percentage were significantly different for different antibiotics with different concentration (P < 0.05). At day 180, the OTC degradation percentage of chicken feces was higher than that of pig feces, and the highest degradation percentage reached to 85.4% and 92.3% respectively. The half-lives of chicken and pig manures were 26.98 d, 31.32 d respectively. Degradation percentage was negatively correlated with the amount of manures used and positively correlated with incubation time (v = A + Blnt, r > 0.96). At day 50, the photo-degradation and micro-degradation accounted for 20.03% and 3.16% of total reduction. 25.05% decreased in photo degradation and 2.50% increased in microbiological degradation. It is indicated that the degradation effects to OTC from pig manures was superior to chicken manures, photo decomposing played an important role in the process of degradation and indigenous soil microorganisms only had a little effect on it. With the extension of incubation time, microbiological decomposing became better, but photo decomposing became weaker.
开展了模拟室内培养实验，以探究不同粪便中土霉素（OTC）的降解动态，并对其机制进行了研究。结果表明，粪便加速了OTC进入土壤及其降解进程，降解曲线呈L型。不同抗生素在不同浓度下的降解速率和降解率均存在显著差异（P < 0.05）。在第180天，鸡粪中土霉素的降解率高于猪粪，最高降解率分别达到85.4%和92.3%。鸡粪和猪粪的半衰期分别为26.98天和31.32天。降解率与粪便用量呈负相关，与培养时间呈正相关（v = A + Blnt，r > 0.96）。在第50天，光降解和微生物降解分别占总降解量的20.03%和3.16%。光降解减少了25.05%，微生物降解增加了2.50%。结果表明，猪粪对OTC的降解效果优于鸡粪，光分解在降解过程中起重要作用，而土壤原生微生物对其影响较小。随着培养时间的延长，微生物分解作用增强，但光分解作用减弱。
