水生态学杂志2024，Vol.45Issue(3)：10-20,11.DOI:10.15928/j.1674-3075.202403100066
微塑料对稻田土壤-水界面重金属分布及迁移的影响
Effects of Microplastic Addition on the Distribution and Migration of Heavy Metals at the Paddy Soil-Water Interface
摘要
Abstract
Research on the mechanisms of microplastics(MPs)on the spatial distribution and migra-tion of heavy metals at the soil-water interface in paddy fields provides theoretical support and a sci-entific basis for studying the interaction between MPs and heavy metals at the micro-interface envi-ronment,as well as assessing the ecological risk.In July 2021,black soils from paddy fields in Northeast China were collected for a rice seedling culture experiment.The experimental treatments in-cluded fertilization and no fertilization,with four MP addition groups(SH,10 mm MP 40 g;SL,10 mm MP 4 g;BH,80 mm MP 40 g;BL,80 mm MPs 4 g)and a control group(CK)for each treatment.The experiment began on July 5th,2021,and lasted 73 days,with four replicates of each group.On the last day of the experiment,high-resolution in-situ information on bioavailable heavy metals at the paddy soil-water micro-interface was obtained at the millimeter scale using the diffusive gradient thin film(DGT)technique.The migration characteristics and release flux of heavy metals under the different MP treatments were evaluated based on Fick's first law of diffusion.Results show:(1)There were significant spatial distribution differences in the concentrations of bioavailable Mn,Co,Fe,Ni,Zn,Pb,Cu,and Cd at the soil-water micro-interface of paddy fields.(2)The addition of MPs significantly reduced the concentrations of bioavailable Cu(-50.7％to 8％,P＜0.001),Zn(-17.1％to-4.1％,P＜0.001),and Cd(-16.7％to-2.2％,P＜0.001).(3)The addition of MPs to soil changed the migration direction of bioavailable Cu,transforming the soil from a source of Cu into a sink,indicat-ing significant adsorption of Cu by MPs.(4)The impact of different MPs particle sizes on bioavail-able Ni varied,with larger MP particles(80 mm)increasing Ni concentration and smaller MP parti-cles(10 mm)decreasing Ni concentration.关键词
微塑料/土壤-水微界面/重金属/原位高分辨率信息/迁移特征Key words
microplastics/soil-water interface/heavy metals/in-situ high-resolution bioavailability/migration characteristics分类
资源环境引用本文复制引用
朱晓艳,王琪琛,姜懿真,武忠,柳钟惠,陈吉孝,王钰琳,袁宇翔..微塑料对稻田土壤-水界面重金属分布及迁移的影响[J].水生态学杂志,2024,45(3):10-20,11.基金项目
上海市水务局科研项目(沪水科2021-10). （沪水科2021-10）
