Chen Xuan, Xie Yijie, Wang Jing, Shi Zhaoji, Zhang Jiaen, Wei Hui, Ma Yibing
Guangdong Laboratory for Lingnan Modern Agriculture, Guangdong Provincial Key Laboratory of Eco-circular Agriculture, South China Agricultural University, Guangzhou 510642, China; College of Natural Resources and Environment, South China Agricultural University, Guangzhou 510642, China.
College of Natural Resources and Environment, South China Agricultural University, Guangzhou 510642, China.
Sci Total Environ. 2023 Jun 25;879:162967. doi: 10.1016/j.scitotenv.2023.162967. Epub 2023 Mar 21.
Microplastics (MPs) are regarded as potential persistent organic pollutants owing to their small size and low degradability. However, the effect of MP pollution on greenhouse gas (GHG) emissions from farmland soil is yet unclear. Therefore, a series of microcosm experiments were set up using polyvinyl chloride (PVC), polypropylene (PP), polyethylene (PE), polystyrene (PS), and polyester (PET) at concentrations of 0.25 %, 2 %, and 7 % (w/w). Each treatment had three replicates. This experiment was carried out to verify the effect of MP pollution on greenhouse gas (GHG) emissions from farmland soil. The results showed that the addition of MPs significantly promoted the emissions of the three main GHGs, including nitrous oxide (NO), carbon dioxide (CO), and methane (CH). Especially, PE may cause most GHG emissions which would contribute to climate warming when its pollution concentration increased. In addition, different doses and types of MPs could affect microbial community structure. These findings of this present study may provide a scientific and practical reference for the prevention and control of MPs pollution and risk assessment of global climate change caused by MPs.
微塑料（MPs）因其粒径小和难降解性而被视为潜在的持久性有机污染物。然而，MP污染对农田土壤温室气体（GHG）排放的影响尚不清楚。因此，开展了一系列微观实验，使用浓度为0.25%、2%和7%（w/w）的聚氯乙烯（PVC）、聚丙烯（PP）、聚乙烯（PE）、聚苯乙烯（PS）和聚酯（PET）。每个处理设置三个重复。本实验旨在验证MP污染对农田土壤温室气体（GHG）排放的影响。结果表明，添加MPs显著促进了三种主要温室气体的排放，包括一氧化二氮（NO）、二氧化碳（CO）和甲烷（CH）。特别是，当PE的污染浓度增加时，可能导致最多的温室气体排放，这将加剧气候变暖。此外，不同剂量和类型的MPs会影响微生物群落结构。本研究的这些发现可为MPs污染的防控以及MPs引起的全球气候变化风险评估提供科学实用的参考。
