摘要
采用实验室模拟试验研究了微生物及不同环境条件对土壤中噻吩磺隆降解的影响。结果表明,噻吩磺隆降解速率与土壤温度、湿度呈正相关,与农药初始用量呈负相关,噻吩磺隆在土壤中的降解以微生物降解为主。当温度从5上升到35℃时,噻吩磺隆的降解速率增加了2.9倍;当土壤湿度从饱和含水量的25%提高到75%时,噻吩磺隆的降解半衰期由7.6缩短至2.6d;当土壤中噻吩磺隆初始用量从2.5增加到10.0mg.kg-1时,其降解半衰期由3.1延长至7.6d;未灭菌土壤中噻吩磺隆降解迅速,半衰期为3.9d,而灭菌土壤中噻吩磺隆降解半衰期延长至14.7d。
Effects of environmental conditions on bio-degradation of thifensulfuron was studied in laboratory. Results shown that hio-degradation rate of thifensulfuron was positively related to soil temperature and moisture content, but negatively to the initial concentration of thifensulfuron applied. The higher the soil temperature and the moisture content, the higher the degradation rate; but the higher the initial thifensulfuron concentration, the lower the degradation rate. The degradation rate increased by 2. 9 times, when the temperature rose from 5 to 35 ℃. The half-life of thifensulfuron decreased to 2. 6 from 7.6 d when the soil moisture content rose from 25% to 75% in saturated water content, but increased from 3. 1 to 7.6 d when the initial applieation rate of thifensulfuron rose from 2.5 to 10 mg · kg^-1.
出处
《生态与农村环境学报》
CAS
CSSCI
CSCD
北大核心
2010年第2期185-188,共4页
Journal of Ecology and Rural Environment
基金
农业部农药检定所项目(NYCL20050012)
校稳定人才基金(XJZ200825)
关键词
噻吩磺隆
土壤
降解
thifensulfuron
soil
degradation
