Liao Yu-Liang, Tang Qi-Xuan, Yang Jin-Yan
College of Architecture and Environment, Sichuan University, Chengdu 610065, China; Yibin Institute of Industrial Technology, Sichuan University Yibin Park, Yibin 644000, China.
College of Architecture and Environment, Sichuan University, Chengdu 610065, China; Yibin Institute of Industrial Technology, Sichuan University Yibin Park, Yibin 644000, China.
J Hazard Mater. 2023 Oct 5;459:132270. doi: 10.1016/j.jhazmat.2023.132270. Epub 2023 Aug 11.
Microplastics have significant implications for global ecosystems. The microplastic distribution, types, sources, and quantified microplastic-heavy metal synergistic pollution in agricultural soil in Chengdu, China were analyzed. The microplastics were detected in all soil samples collected from 103 sites, with concentrations ranging from 1333 to 15067 particle kg. The abundance of microplastics in grassland (12,667 ± 3394 particle kg) was more than twice higher than that in open field, vegetable field, orchard, and woodland. The main morphological types of microplastics included fibers, films, and granules (all "3-Dimensional" microplastics), with the colors red, blue, and transparent. Granular and fiber microplastics were predominantly in particles < 500 mm, while film microplastics were uniformly distributed at all sizes. The plastic compositions were mainly polypropylene and polyethylene plastics, accounting for 20.73% and 27.90% of the soil microplastic, respectively. Agricultural plastic applications and irrigation water were the sources of soil microplastics. The concentration of Cd, Cr, and Cu in the microplastics was strongly correlated with the corresponding concentration in the soils (p < 0.01), and the microplastic-heavy metal synergistic pollution might deteriorate the soil environment. The results of soil TOC measurements were influenced by microplastics in the soil. The results provide important data for the characteristics of microplastics in the agroecosystem.
微塑料对全球生态系统具有重大影响。对中国成都农业土壤中的微塑料分布、类型、来源以及微塑料-重金属协同污染进行了量化分析。在从103个地点采集的所有土壤样本中均检测到了微塑料，其浓度范围为1333至15067个颗粒/千克。草地中微塑料的丰度（12,667 ± 3394个颗粒/千克）比农田、菜地、果园和林地中的丰度高出两倍多。微塑料的主要形态类型包括纤维、薄膜和颗粒（均为“三维”微塑料），颜色有红色、蓝色和透明。颗粒状和纤维状微塑料主要存在于粒径小于500微米的颗粒中，而薄膜状微塑料在所有尺寸上分布均匀。塑料成分主要是聚丙烯和聚乙烯塑料，分别占土壤微塑料的20.73%和27.90%。农业塑料应用和灌溉水是土壤微塑料的来源。微塑料中镉、铬和铜的浓度与土壤中相应浓度高度相关（p < 0.01），微塑料-重金属协同污染可能会使土壤环境恶化。土壤总有机碳测量结果受土壤中微塑料的影响。研究结果为农业生态系统中微塑料的特性提供了重要数据。
