Microplastics from polyvinyl chloride agricultural plastic films do not change nitrogenous gas emission but enhance denitrification potential,Journal of Hazardous Materials

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Microplastics from polyvinyl chloride agricultural plastic films do not change nitrogenous gas emission but enhance denitrification potential
Journal of Hazardous Materials ( IF 12.2 ) Pub Date : 2024-09-05 , DOI: 10.1016/j.jhazmat.2024.135758
Xiaofang Ma ₁ , Zhijun Wei ₂ , Xiaomin Wang ₂ , Chenglin Li ₂ , Xueying Feng ₂ , Jun Shan ₂ , Xiaoyuan Yan ₂ , Rong Ji ₃

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The effects of microplastics (MPs) from agricultural plastic films on soil nitrogen transformation, especially denitrification, are still obscure. Here, using a robotized flow-through system, we incubated vegetable upland soil cores for 66 days with MPs from PE mulching film (F-PE) and PVC greenhouse film (F-PVC) and directly quantified the emissions of nitrogenous gases from denitrification under oxic conditions, as well as the denitrification potential under anoxic conditions. The impact of MPs on soil nitrogen transformation was largely determined by the concentration of the additive phthalate esters (PAEs) containing in the MPs. The F-PE MPs with low level of PAEs (about 0.006 %) had no significant effect on soil mineral nitrogen content and nitrogenous gas emissions under oxic conditions. In contrast, the F-PVC MPs with high levels of PAEs (about 11 %) reduced soil nitrate content under oxic conditions, probably owing to promoted microbial assimilation of nitrogen, as the emissions of denitrification products (N2, NO, and N2O) was not affected. However, the F-PVC MPs significantly enhanced the denitrification potential of the soil due to the increased abundance of denitrifiers under anoxic conditions. These findings highlight the disturbance of MPs from agricultural films, particularly the additive PAEs on nitrogen transformation in soil ecosystems.

中文翻译：

聚氯乙烯农用塑料薄膜中的微塑料不会改变含氮气体排放，但会提高反硝化潜力

农用塑料薄膜中的微塑料（MP）对土壤氮转化，尤其是反硝化的影响仍然不清楚。在这里，我们使用机器人流通系统，将蔬菜高地土壤芯与 PE 地膜（F-PE）和 PVC 温室薄膜（F-PVC）的 MP 孵育 66 天，并直接量化了在含氧条件下反硝化产生的氮气排放，以及在缺氧条件下的反硝化潜力。MPS 对土壤氮转化的影响主要取决于 MPS 中所含的邻苯二甲酸酯（PAE）的浓度。在高氧条件下，PAEs含量低（约0.006 %）的F-PE MPs对土壤矿物氮含量和氮气排放无显著影响。相比之下，具有高水平 PAEs（约 11%）的 F-PVC MPs 在含氧条件下降低了土壤硝酸盐含量，这可能是由于促进了微生物对氮的同化，因为反硝化产物（N2、NO 和 N2O）的排放不受影响。然而，由于在缺氧条件下反硝化剂的丰度增加，F-PVC MPs 显着增强了土壤的反硝化潜力。这些发现突出了农膜对 MPs 的干扰，特别是加性 PAE 对土壤生态系统中氮转化的影响。

更新日期：2024-09-05

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