摘要
为准确评估释放到农田生态系统中的纳米银(AgNP)对作物生长的影响,选取大豆(Glycine max L.xudou16)为对象,分别在叶面暴露、根系暴露以及叶面和根系综合暴露途径下连续14 d暴露AgNP(10 mg·L^(-1))及AgNO_3(1 mg·L^(-1)),考察大豆对AgNP及AgNO_3的吸收和转运。研究结果发现:三种暴露途径下大豆新叶中积累的Ag为0.06~1.03μg·g^(-1),单独叶面暴露下大豆根部积累的银为1.07~1.47μg·g^(-1),表明AgNP能够被大豆吸收并发生转运。对比叶面暴露和根系暴露发现,根系暴露途径下Ag的迁移系数高于叶面暴露的迁移系数(64.5~140倍);无论哪种暴露途径,AgNO_3处理的迁移系数均大于AgNP处理(2.5~25倍),表明除了暴露途径的影响,Ag的形态(即AgNP或AgNO_3)也会影响大豆新叶中Ag的积累。因此,在评估AgNP对农作物生长的风险时,应综合考虑其暴露途径和Ag的形态。
In order to access accurately the impact of released AgNP on crops growth into the farmland ecosystem, a soybean（Glycine max L. xudou16）was treated as the testing plant, exposed by AgNP（10 mg·L^（-1））and AgNO_3（1 mg·L^（-1））in routes of foliar, root and their combined exposure for 14 days respectively. Irrespective of exposure routes, Ag accumulation in new leaves（which were not exposed to AgNP） were 0.06 ~1.03 μg·g^（-1）in above three exposure routes, while Ag accumulation in roots were 1.07 ~1.47 μg·g^（-1）in foliar exposure route, indicating that AgNP could be taken up and translocated within the soybean. Compared with the transfer efficient of Ag by foliar expo-sure, those by root exposure were much higher（64. 5 ~ 140 times）. In all exposure routes, the transfer efficient of AgNO_3 treatment was higher than that of AgNP treatment（2.5~25 times）, suggesting that both the exposure route and the silver species（AgNP or AgNO_3）affected the accumulation of Ag in soybean leaves. Consequently, both of the exposure route and Ag species should be concerned when accessing the risk of AgNP on crops groth.
出处
《农业环境科学学报》
CAS
CSCD
北大核心
2016年第12期2285-2291,共7页
Journal of Agro-Environment Science
基金
国家自然科学基金重点项目(41430752)
关键词
AgNP
大豆
吸收
转运
nanosilver
soybean
uptake
transport
