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Impacts of polypropylene microplastics on the distribution of cadmium, enzyme activities, and bacterial community in black soil at the aggregate level
Science of the Total Environment ( IF 8.2 ) Pub Date : 2024-01-28 , DOI: 10.1016/j.scitotenv.2024.170541 Quan-Ying Wang 1 , Qi-Rong Wang 1 , Tian-Ye Wang 1 , Shao-Qing Zhang 1 , Hong-Wen Yu 1
Science of the Total Environment ( IF 8.2 ) Pub Date : 2024-01-28 , DOI: 10.1016/j.scitotenv.2024.170541 Quan-Ying Wang 1 , Qi-Rong Wang 1 , Tian-Ye Wang 1 , Shao-Qing Zhang 1 , Hong-Wen Yu 1
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Microplastics (MPs) can co-occur widely with heavy metals in soil. This study intended to investigate the influences of the -exposure of polyethylene MPs (0.5 %, /w) and cadmium (Cd) in black soil on the Cd distribution, enzyme activities, and bacterial communities in both bulk soil and different sized soil aggregates (> 1, 0.50–1, 0.25–0.50, and < 0.25 mm aggregates) after a 90-day incubation. Our results showed that the existence of MPs increased the distributions of Cd in >1 mm and < 0.25 mm soil aggregates and decreased its distributions in 0.50–1 mm and 0.25–0.50 mm soil aggregates. About 12.15 %–17.65 % and 9.03 %–11.13 % of Cd were distributed in the exchangeable and oxidizable forms in bulk soil and various sized soil aggregates after the addition of MPs which were higher than those in the only Cd-treated soil (11.17 %–14.72 % and 8.66 %–10.43 %, respectively), while opposite tendency was found for Cd in the reducible form. Urease and β-glucosidase activities in the Cd-treated soils were 1.14–1.18 and 1.07–1.31 times higher than those in the Cd-MPs treated soils. MPs disturbed soil bacterial community at phylum level and increased the bacteria richness in bulk soil. The levels of predicted functional genes which are linked to the biodegradation and metabolism of exogenous substances and soil C and N cycles were altered by the co-exposure of Cd and MPs. The findings of this study could help deepen our knowledge about the responses of soil properties, especially microbial community, to the co-occurrence of MPs and heavy metals in soil.
中文翻译：
聚丙烯微塑料对黑土中镉分布、酶活性和细菌群落总体水平的影响
微塑料（MP）可以与土壤中的重金属广泛共存。本研究旨在探讨黑土中聚乙烯MP（0.5%，/w）和镉（Cd）的暴露对大块土壤和不同尺寸土壤团聚体中镉分布、酶活性和细菌群落的影响（ > 1、0.50–1、0.25–0.50 和 < 0.25 毫米聚集体）在 90 天孵化后。我们的结果表明，MPs的存在增加了Cd在>1 mm和<0.25 mm土壤团聚体中的分布，并减少了其在0.50-1 mm和0.25-0.50 mm土壤团聚体中的分布。添加 MPs 后，约 12.15 %~17.65 % 和 9.03 %~11.13 % 的 Cd 以可交换和可氧化的形式分布在大块土壤和各种大小的土壤团聚体中，高于单独处理 Cd 的土壤（11.17 %）。 –14.72 % 和 8.66 % – 10.43 %，分别），而可还原形式的 Cd 则发现相反的趋势。 Cd处理土壤中脲酶和β-葡萄糖苷酶活性分别比Cd-MPs处理土壤高1.14-1.18和1.07-1.31倍。 MPs 在门水平上扰乱了土壤细菌群落，增加了土壤中的细菌丰富度。与外源物质的生物降解和代谢以及土壤碳氮循环相关的预测功能基因的水平因 Cd 和 MP 的共同暴露而改变。这项研究的结果有助于加深我们对土壤性质（尤其是微生物群落）对土壤中 MP 和重金属共存的响应的认识。
更新日期：2024-01-28
中文翻译：
聚丙烯微塑料对黑土中镉分布、酶活性和细菌群落总体水平的影响
微塑料（MP）可以与土壤中的重金属广泛共存。本研究旨在探讨黑土中聚乙烯MP（0.5%，/w）和镉（Cd）的暴露对大块土壤和不同尺寸土壤团聚体中镉分布、酶活性和细菌群落的影响（ > 1、0.50–1、0.25–0.50 和 < 0.25 毫米聚集体）在 90 天孵化后。我们的结果表明，MPs的存在增加了Cd在>1 mm和<0.25 mm土壤团聚体中的分布，并减少了其在0.50-1 mm和0.25-0.50 mm土壤团聚体中的分布。添加 MPs 后，约 12.15 %~17.65 % 和 9.03 %~11.13 % 的 Cd 以可交换和可氧化的形式分布在大块土壤和各种大小的土壤团聚体中，高于单独处理 Cd 的土壤（11.17 %）。 –14.72 % 和 8.66 % – 10.43 %，分别），而可还原形式的 Cd 则发现相反的趋势。 Cd处理土壤中脲酶和β-葡萄糖苷酶活性分别比Cd-MPs处理土壤高1.14-1.18和1.07-1.31倍。 MPs 在门水平上扰乱了土壤细菌群落，增加了土壤中的细菌丰富度。与外源物质的生物降解和代谢以及土壤碳氮循环相关的预测功能基因的水平因 Cd 和 MP 的共同暴露而改变。这项研究的结果有助于加深我们对土壤性质（尤其是微生物群落）对土壤中 MP 和重金属共存的响应的认识。
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