【作者】 杨仁斌； 高海英； 龚道新；

【Author】 YANG Ren-bin,GAO Hai-ying,GONG Dao-xin (Institute of Agro-Environmental Protection,Hunan Agricultural University,Changsha 410128,China)

【机构】 湖南农业大学农业环境保护研究所；

【摘要】 运用恒温培养法研究了三唑酮在湘南红壤中中的降解动态及环境因素对其的影响,研究结果表明,供试土壤对三唑酮有一定的降解能力,且在相同温度、湿度和光照条件下,相同浓度的三唑酮在灭菌土壤中的持效期比在非灭菌土壤中的持效期长;随着添加浓度从0.82mg/kg增大到8.2mg/kg,三唑酮的降解半衰期从35.9d减少到10.2d;与光照处理相比,黑暗可延长土壤中三唑酮的持效期;在试验湿度范围内,三唑酮在非灭菌土壤中的持效期随土壤湿度的提高而变长。综上可见,4种试验因子对土壤中三唑酮的降解均有不同程度的影响。其中土壤微生物是影响三唑酮降解的主要因素,有利于土壤中微生物生长的环境因素,如适宜的土壤湿度等对土壤中三唑酮的降解有促进作用。可以预测,通过改变环境因子可以起到对农药的持效期进行人工调控的作用。更多还原

【Abstract】 The degradation and influencing factors of triadimefon in Quatemary Red Soil were studied in lab.The results indicated that persistence of triadimefon was much shorter in non-sterilized soil than that in sterilizes soil under the same conditions of triadimefon concentrations,soil moisture,temperature and light;half-life of triadimefon decreased from 35.9d to 10.2d when the soil was treated with triadimefon of 0.82mg/kg,4.10mg/kg,8.2mg/kg; Within the range of soil moisture tested,the persistence of triadimefon increased with increasing of soil moisture in non-sterilized soil;Longer persistence was observed in dark than in day;Microorganism was a critical factor among all the experimental factors that variedly influenced triadimefon in soils,and could accelerate greatly the degradation in soil.The environmental factors favorable for the growth of microbes could also enhance the degradation of triadimefon.It may be possible to regulate persistence of triadimefon by controlling environmental condition.更多还原