<br>微塑料对黄果皮和马缨丹对 Cd、Pb 和 Zn 污染土壤植物修复的影响,Environmental Research

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微塑料对黄果皮和马缨丹对 Cd、Pb 和 Zn 污染土壤植物修复的影响
Environmental Research ( IF 7.7 ) Pub Date : 2023-06-02 , DOI: 10.1016/j.envres.2023.116312
Qiankui Yu ₁ , Bo Gao ₂ , Ping Wu ₁ , Minni Chen ₁ , Chuanqian He ₁ , Xingfeng Zhang ₁

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微塑料是新兴污染物，已成为全球环境问题。微塑料对重金属污染土壤植物修复的影响尚不清楚。通过盆栽试验研究了聚乙烯（PE）和镉（Cd）、铅（Pb）和锌（Zn）四种添加量（0、0.1%、0.5% 和 1% w·w−1）对两种高积累剂（Solanum photeinocarpum 和 Lantana camara）PE 生长和重金属积累的影响PE 显著降低土壤中脱氢酶和磷酸酶的 pH 值和活性，同时它提高了土壤中 Cd 和 Pb 的生物利用度。PE 显著提高了植物叶片中的过氧化物酶（POD）、过氧化氢酶（CAT）和丙二醛（MDA）活性。PE 对株高没有明显影响，但它确实显着阻碍了根系生长。PE 影响土壤和植物中重金属的形态含量，但不会改变它们的比例。PE 使两种植物的地上部和根系重金属含量分别提高了 8.01–38.32% 和 12.24–46.28%。而 PE 显著降低了植物地上部 Cd 的提取量，同时显著提高了黄果木植物根系中 Zn 的提取量。对于卡马拉栗，较低（0.1%）的 PE 添加量抑制了植物芽中 Pb 和 Zn 的提取量，但较高的 PE 添加量（0.5% 和 1%）刺激了植物根中 Pb 的提取量和植物芽中 Zn 的提取量。结果表明，PE 微塑料对土壤环境、植物生长以及 Cd 和 Pb 的植物修复效率有负面影响。这些发现有助于更好地了解微塑料和重金属污染土壤的相互作用。

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Effects of microplastics on the phytoremediation of Cd, Pb, and Zn contaminated soils by Solanum photeinocarpum and Lantana camara

Microplastics are emerging pollutants and have become a global environmental issue. The impacts of microplastics on the phytoremediation of heavy metal–contaminated soils are unclear. A pot experiment was conducted to investigate the effects of four additions (0, 0.1%, 0.5%, and 1% w·w−1) of polyethylene (PE) and cadmium (Cd), lead (Pb), and zinc (Zn) contaminated soil on the growth and heavy metal accumulation of two hyperaccumulators (Solanum photeinocarpum and Lantana camara). PE significantly decreased the pH and activities of dehydrogenase and phosphatase in soil, while it increased the bioavailability of Cd and Pb in soil. Peroxidase (POD), catalase (CAT), and malondialdehyde (MDA) activity in the plant leaves were all considerably increased by PE. PE had no discernible impact on plant height, but it did significantly impede root growth. PE affected the morphological contents of heavy metals in soils and plants, while it did not alter their proportions. PE increased the content of heavy metals in the shoots and roots of the two plants by 8.01–38.32% and 12.24−46.28%, respectively. However, PE significantly reduced the Cd extraction amount in plant shoots, while it significantly increased the Zn extraction amount in the plant roots of S. photeinocarpum. For L. camara, a lower addition (0.1%) of PE inhibited the extraction amount of Pb and Zn in the plant shoots, but a higher addition (0.5% and 1%) of PE stimulated the Pb extraction amount in the plant roots and the Zn extraction amount in the plant shoots. Our results indicated that PE microplastics have negative effects on the soil environment, plant growth, and the phytoremediation efficiency of Cd and Pb. These findings contribute to a better knowledge of the interaction effects of microplastics and heavy metal–contaminated soils.

更新日期：2023-06-02

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