Chen Su, Feng Tianzhen, Lin Xiaonan, Hou Ziyan, Chao Lei, Zhang Xiaoying, Liu Ying
Key Laboratory of Regional Environment and Eco-Remediation, Ministry of Education, Shenyang University, Shenyang, 110044, PR China; Shenyang Jianzhu University, Shenyang, 110168, PR China.
Key Laboratory of Regional Environment and Eco-Remediation, Ministry of Education, Shenyang University, Shenyang, 110044, PR China.
Plant Physiol Biochem. 2023 Mar;196:291-301. doi: 10.1016/j.plaphy.2023.01.023. Epub 2023 Jan 12.
Two types of microplastics (MPs) (micro polyethylene (mPE) and micro polypropylene (mPP)) were studied alongside and cadmium (Cd) to determine how they affected soil-wheat systems, both individually and in mixed combinations. This was accomplished by carrying out a pot experiment to reveal their respective interaction effects. Results showed that in different Cd pollution levels soils (0, 1, and 5 mg kg), chlorophyll concentrations in wheat leaves decreased markedly with rising levels of mPE/mPP. In the single mPE treatment, as the mPE content in the soil increased, the aboveground and root biomass improved. By contrast, in the single mPP treatment, when the mPP content was low, the aboveground biomass of wheat increased and with the mPP content increased, the aboveground biomass of wheat decreased. This result was also shown in the combined contamination of mPE/mPP and Cd (1 mg kg) in the root biomass. With an increase in Cd concentration (that is, at 5 mg kg) in the combined contamination, this phenomenon continued in the aboveground biomass while in the roots, there was a promotion effect. At Cd contaminated soil (1 mg kg), MPs inhibited Cd enrichment in aboveground wheat, but at 5 mg kg, Cd enrichment was promoted instead, in both aboveground and roots. Adding mPE/mPP diminished pH and the Cd effective state concentration in soil. The combined contamination of mPE/mPP and Cd affected the Cd biological enrichment in the wheat to some extent, which was influenced by the types of MP and pollution levels of Cd in the soil.
研究了两种微塑料（MPs）（微聚乙烯（mPE）和微聚丙烯（mPP））以及镉（Cd），以确定它们如何单独以及混合组合影响土壤-小麦系统。这是通过进行盆栽试验来揭示它们各自的相互作用效应来实现的。结果表明，在不同镉污染水平的土壤（0、1和5毫克/千克）中，小麦叶片中的叶绿素浓度随着mPE/mPP水平的升高而显著降低。在单一mPE处理中，随着土壤中mPE含量的增加，地上部和根部生物量有所提高。相比之下，在单一mPP处理中，当mPP含量较低时，小麦地上部生物量增加，而随着mPP含量增加，小麦地上部生物量下降。这种结果在mPE/mPP与镉（1毫克/千克）的复合污染对根生物量的影响中也有体现。在复合污染中随着镉浓度增加（即5毫克/千克），地上部生物量中这种现象持续存在，而在根部则有促进作用。在镉污染土壤（1毫克/千克）中，微塑料抑制了镉在小麦地上部的富集，但在5毫克/千克时，地上部和根部的镉富集反而得到促进。添加mPE/mPP降低了土壤的pH值和镉的有效态浓度。mPE/mPP与镉的复合污染在一定程度上影响了小麦中镉的生物富集，这受到微塑料类型和土壤中镉污染水平的影响。
