克百威、乐果在陆生微宇宙土芯中的降解和淋溶研究

通过陆生微宇宙土芯淋溶试验研究克百威、乐果在常州水稻土和海安高砂土2种土壤中的降解和淋溶特性。结果表明:在整个实验周期,克百威、乐果在高砂土、水稻土不同土层中的含量依次为0~1010~3030~60cm;施药后2h淋溶,2种农药在水样中的检出浓度均较高;就2种农药对比而言,乐果在淋溶水样中浓度降低较为迅速,14d时淋溶水样中就未检出,而克百威在14d时仍有检出。受试农药的理化性质、降解特性及受试土壤的理化性等因素能很好地诠释试验结果。研究一方面可为这2种农药的科学使用提供参考,另一方面,为陆生微宇宙系统的开发、应用提供借鉴。

Degradation and Leaching of Carbofuran and Dimethoate in Terrestrial Soil-Core Microcosm

Degradation and Leaching of Carbofuran and Dimethoate in Terrestrial Soil-Core Microcosm were studied. And results showed that： During the experiment, the contents of the two pesticides in different layers of Haian high sandy soil and Changzhou paddy soil were always following this： 0 ~10 〉10 ~30 〉30-60cm; When simulating precipitation two hours after application, the concentrations of the two pesticides in leaching water samples were high; Dimethoate concentrations in leaching water samples reduced more rapidly and could not be detected in 14d leaching water samples, while Carbofuran could still be seized in 14d leaching water samples; The test results could be perfectly interpreted by the physic-chemical properties, the degradation characteristics of the test pesticides and the physic-chemical properties of the test soil. The study could not only provide reference for the scientific use of these two pesticides, but also provide reference for the developing and applying of the terrestrial Soil-Core Microcosm.