不同微塑料赋存环境对小麦萌发与幼苗生长影响研究

为揭示不同微塑料赋存环境对小麦(Triticum aestivum L.)种子萌发和幼苗生长的影响,选取聚丙烯(Polypropylene,PP)、高密度聚乙烯(HDPE)和聚乳酸生物可降解塑料(PLA)3种微塑料,并分别设置3种微塑料粒径(150μm、 1000μm和4000μm)和质量浓度(0.1g/kg、0.5g...

Effects of different microplastics occurrence environment on seed germination and seedling growth of wheat (Triticum aestivum L.)

In order to reveal the effects of different microplastics occurrence environment on seed germination and seedling growth of wheat (Triticum aestivum L.), the Polypropylene (PP), High Density Polyethylene (HDPE) and Biodegradable Polylactic Acid (PLA) were selected, the pot experiments were carried out in natural environment with the particle sizes (150μm, 1000μm and 4000μm) and mass concentrations (0.1g/kg, 0.5g/kg and 1g/kg), and the germination rates, germination inhibition rates, growth characteristics and seedling growth trends of wheat were analyzed by statistical analysis and variance analysis. The results showed that the average germination level of wheat seeds was reduced under different microplastics exposure, and the average germination inhibition rates of wheat seeds showed HDPE>PLA>PP; the average germination inhibition rates of wheat seeds under medium particle size and medium mass concentration of microplastics were the highest, which were 5.65% and 4.55%, respectively, while the inhibitory effects of microplastics on wheat seed germination were weakened at low or high particle size and mass concentration under low or high particle size and mass concentration of microplastics; the particle size of microplastics had a greater effect on the germination rate of wheat seeds, followed by the type and mass concentration of microplastics. The effects of microplastics HDPE and PLA on the growth characteristics of wheat seeds (germination potential, germination index, vigor index and average germination time) were more significant than those of microplastics PP compared with the control group, and the vigor index of wheat seeds was most significantly affected by the type, particle size and mass concentration of microplastics. The average growth rates of the control group and different types of microplastics on wheat seedlings showed CK>PP>HDPE>PLA, while the inhibitory effects of different microplastics on the growth of wheat seedlings showed PLA>HDPE>PP, and the type of microplastics had the most significant effect on the growth of wheat seedlings.