PDF(Pubmed)
Abstract：
Systemic plant protection products, such as neonicotinoids (NIs), are capable of being translocated throughout a plant. Although NIs are less toxic to mammals, fish, and birds, their impact on microbial and non-target insects is of concern. This study investigates the uptake, translocation, and accumulation of the NI, imidacloprid (IMI), in romaine lettuce (Lactuca sativa L. var. longipolia). Exposing 15-day-old seedlings to \"10 mg/L\" of IMI, the effects on microbial communities in both cultivated (CS) and non-cultivated soil (NCS) were studied along with IMI translocation within plant tissues. The concentrations of IMI in soil varied temporally and between soil types after initial application, with a decrease from 2.0 and 7.7 mg/kg on the first day of sampling to 0.5 and 2.6 mg/kg on the final sampling day (day 35) for CS and NCS, respectively. The half-life of IMI soil was 10.7 and 72.5 days in CS and NCS, respectively, indicating that IMI degraded more quickly in CS, possibly due to smaller grain size, aeration, microbial degradation, and water flow. The accumulated concentrations of IMI in lettuce tissues ranged from 12.4 ± 0.2 and 18.7± 0.9 mg/kg in CS and NCS, respectively. The highest concentration of IMI was found in the shoots, followed by the roots, whereas the soil showed the lowest IMI residuals at the end of the trial. Soil bacteria and fungi were altered by the application of IMI, with a lower abundance index within the bacterial community, indicating a negative impact on the distribution of bacteria in the soil.
摘要：
系统植物保护产品，如新烟碱（NIs），能够在整个植物中转移。尽管NIs对哺乳动物的毒性较小，鱼,和鸟,它们对微生物和非目标昆虫的影响令人担忧。这项研究调查了吸收，易位,和NI的积累，吡虫啉(IMI),在生菜中（LactucasativaL.var。longipolia）。将15天龄的幼苗暴露于“10毫克/升”的IMI，研究了对栽培（CS）和非栽培土壤（NCS）中微生物群落的影响以及植物组织内的IMI易位。初始施用后，土壤中IMI的浓度随时间和土壤类型之间的变化而变化，CS和NCS从采样第一天的2.0和7.7mg/kg下降到最终采样日（第35天）的0.5和2.6mg/kg，分别。在CS和NCS中，IMI土壤的半衰期分别为10.7天和72.5天，分别,表明IMI在CS中降解更快，可能是由于晶粒尺寸较小，曝气,微生物降解，和水流。在CS和NCS中，莴苣组织中IMI的累积浓度范围为12.4±0.2和18.7±0.9mg/kg，分别。在枝条中发现了最高浓度的IMI，其次是根，而在试验结束时，土壤显示出最低的IMI残差。通过IMI的应用改变了土壤细菌和真菌，细菌群落中的丰度指数较低，这表明对土壤中细菌的分布有负面影响。
