溴氰虫酰胺在田水-土壤-水稻系统中迁移转化及微生物效应分析

Cyantraniliprole will be widely used in the rice fields. Cyantraniliprole and its major metabolite will be accumulated in rice products and paddy environment, which could easily lead to the rice product safety risks and paddy environmental risks. The previous work demonstrated that cyantraniliprole was degraded into J9Z38 in rice plants, water and soil. The main metabolite J9Z38 were degraded slowly and accumulated in water and soil. The field simulated experiments will be used, in accordance with the basis of our previous work. The degradation and metabolize of cyantraniliprole will be investigated in all parts of rice plants (straw, husk, and rice). The residues and accumulation of cyantraniliprole and its metabolite J9Z38 will be studied in the process of migrating from paddy environment (paddy soil and water) into rice plants (straw, husk, and rice), but also from rice plants into paddy environment. The transport and transformation of cyantraniliprole will be explored in the paddy water-soil-rice systems. Incubation experiments will be carried out to evaluate the paddy soil microbial effects of cyantraniliprole. Microbiological indicators may be filtered out, which can reflect the short-term effects of soil quality status. The study investigated cyantraniliprole transport and transformation in rice fields, and soil microbial effect. It is helpful to provide the basis data for the rational use of insecticides in paddy field, the safety of rice product, and the environmental safety of paddy field systems.

溴氰虫酰胺在水稻田具有广泛的应用前景，其大量使用容易造成溴氰虫酰胺及其主要代谢物在水稻产品及稻田环境中蓄积，从而引发水稻产品质量和稻田环境等安全问题。申请者前期工作发现，溴氰虫酰胺在水稻、水和土壤中降解生成J9Z38，代谢物J9Z38在水和土壤等环境中大量蓄积，降解缓慢。在此基础上，本项目拟采用田间模拟试验，探讨溴氰虫酰胺在水稻植株各部位（植株、稻壳、大米）的降解代谢状况；考察溴氰虫酰胺及其代谢物J9Z38由稻田环境（土壤、田水）迁移到水稻植株、由水稻植株迁移到稻田环境过程中的残留和蓄积情况；深入探索溴氰虫酰胺在田水-土壤-水稻系统中的迁移转化规律。通过室内培养试验，初步揭示溴氰虫酰胺影响土壤微生物的效应，以期筛选出能够反映土壤质量状况短期影响的敏感性微生物指标。本项目将为指导水稻田杀虫剂科学合理使用、水稻产品质量安全和水稻田系统的环境安全性提供基础数据。

溴氰虫酰胺在水稻田具有广泛的应用前景，其大量使用容易造成溴氰虫酰胺及其主要代谢物在水稻产品及稻田环境中蓄积，从而引发水稻产品质量和稻田环境等安全问题。. 项目首先建立了溴氰虫酰胺及代谢物J9Z38在水稻、土壤、田水中的检测方法。大田条件下，溴氰虫酰胺在水稻茎叶中的半衰期为3.2-7.1d，代谢物J9Z38的残留量很低（<0.010-0.077mg/kg）；收获期稻秆和稻壳中均能检测到溴氰虫酰胺及代谢物J9Z38，收获期糙米中可检测出溴氰虫酰胺，但J9Z38残留量均为<0.01mg/kg。. 溴氰虫酰胺在水-沉积物系统中可降解为J9Z38；相对于水相，J9Z38更容易在沉积物中累积。溴氰虫酰胺可通过水稻根少量的迁移到田水中，但是J9Z38并未从水稻根迁移到田水中。水稻可以从田水中吸收溴氰虫酰胺及J9Z38到水稻根中，并传导到水稻茎叶中；在田水-水稻系统中，溴氰虫酰胺及J9Z38能够在水稻植株中富集，而且，J9Z38在水稻根中的累积量更大。水稻可以从土壤中吸收溴氰虫酰胺及J9Z38到水稻根中，并传导到水稻茎叶中；在土壤-水稻系统中，溴氰虫酰胺及J9Z38能够在水稻植株中富集。高浓度溴氰虫酰胺（10倍、50倍剂量）影响了土壤微生物群落结构。. 本项目为指导水稻田杀虫剂科学合理使用、水稻产品质量安全和水稻田系统的环境安全性提供科学依据。