环氟菌胺是一种新型酰胺类杀菌剂，其在环境中的归趋备受关注。采用室内模拟试验方法，研究了环氟菌胺在不同土壤和水-沉积物体系中的降解特性。结果表明，好氧条件下，其在江西红壤、太湖水稻土、东北黑土中降解速率分别为0.007、0.007、0.009 d-1，降解半衰期分别为99.0、99.0和77.0 d；积水厌气条件下降解速率为分别为0.004、0.004、0.011 d-1，降解半衰期为173、173和63.0 d。不同类型土壤中降解速率大小为江西红壤≈太湖水稻土<东北黑土，土壤pH值是影响环氟菌胺在土壤中降解的主要因素。好氧条件下河流与湖泊水-沉积物系统中环氟菌胺总量的降解速率分别为0.032、0.028 d-1，降解半衰期分别为21.7和24.8 d；厌氧条件下其降解速率分别为0.028、0.023 d-1，降解半衰期分别为24.8和30.1 d。河流体系的降解速率高于湖泊体系，好氧条件下降解速率高于厌氧条件。环氟菌胺在水-沉积物体系中主要存在于沉积物中，系统降解速率主要受沉积物中的降解速率影响。环氟菌胺在土壤中具有较强稳定性，进入水-沉积物系统时主要分布于沉积物中，可能会对水体和土壤环境造成一定的污染。%Cyflufenamid is a new type of amide germicide, and its environmental behavior has caused increased concern. Biodegradation of cyflufenamid in soils and water-sediments were systematically investigated through simulation test in laboratory. The results showed that the degradation rates of cyflufenamid in soils were 0.007, 0.007, 0.009 d-1under aerobic conditions,the half-times of cyflufenamid degradation were 99.0, 99.0 and 77.0 d, respectively. The degradation rates in soils were 0.004, 0.004, 0.011 d-1under water anaerobic conditions, the half-times were 173, 173 and 63.0 d, respectively. The degradation rate of cyflufenamid in different soils were in the order of Jiangxi red soil≈Taihu paddy soil < Northeast black soil. The pH of soils was the main factor influencing degradation rate. In water-sediment system the degradation rates of cyflufenamid were 0.032 d-1(river system), 0.028 d-1(lake system) under aerobic conditions, the half-times were 21.7 and 24.8 d, respectively. The rates under anaerobic conditions were 0.028 d-1(river system), 0.023 d-1(lake system), while the half-times were 24.8 and 30.1 d. It was demonstrated the degradation rate was faster in river system than in lake system, and was faster in aerobic conditions than anaerobic conditions. Because cyflufenamid have long-term retention in sediment and soil, and more attention should be paid to their residues in the environment.
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