摘要
采用大田、盆栽及室内培养试验，研究了氧化乐果在兰州地区蔬菜土壤中的残留和降解，并研究了土壤微生物、光照、有机肥含量对其降解的影响，比较了不同土壤中氧化乐果的降解速率。结果表明，微生物对氧化乐果的降解作用影响较大，光照的影响次之，土壤有机质的增加对其降解有促进作用，在耕种灌淤土中的降解速率大于自然灰钙土。田间试验得出氧化乐果在自然条件下降解的半衰期为 2- 3 d，需 17 d就可基本降解完毕。
Degradation of organophosphorus pesticide omethoate was investigated in vegetable－ cultivated soil. The studies under field condition revealed that the half－ life of omethoate was only 2- 3 days and residual period was 13 days in soil, respectively. Sunlight, soil microorganisms, and application of manure were selected as potentially affecting factors on the degradation of omethoate. The results demonstrated that the soil microorganism obviously accelerated the degradation of omethoate, suggesting that microorganisms play an important role in degradation of the insecticide. In addition, sunlight also involves in omethoate degradation, but not as important as microorganisms do, especially in the absence of UV－ radiation in sunlight. The rates of degradation was compared with two types of soils, it has been found that the degradation rate was more rapid in cultivated soil than that in non－ cultivated serozem soil, as the former is characterized by more microbial activity.
出处
《农业环境保护》
CSCD
北大核心
2001年第4期249-251,共3页
Agro-Environmental Protection
