College of Natural Resources and Environment, Northwest A&F University, No.3 Taicheng Road, Yangling 712100, Shaanxi, China.
College of Natural Resources and Environment, Northwest A&F University, No.3 Taicheng Road, Yangling 712100, Shaanxi, China; State Key Laboratory of Crop Stress Biology for Arid Areas, Northwest A&F University, Yangling 712100, Shaanxi, China.
Sci Total Environ. 2023 Mar 15;864:161078. doi: 10.1016/j.scitotenv.2022.161078. Epub 2022 Dec 22.
The wide use of plastic film mulch has led to the release of phthalate esters (PAEs), which seriously threatens the soil environment and the safety of crop production. However, it is unknown whether there is a maximum threshold of soil PAEs accumulation induced by plastic film residue, and the dynamic changes of soil PAEs under field conditions are still unclear. To address these issues, a field experiment was conducted to investigate the temporal fluctuations of soil PAEs content and the response of microbial community structure in the field with plastic film residue. Results showed that the content of soil PAEs fluctuated during an observation period of one year, had a periodical peak in winter and summer, and was exacerbated by the increase in the aging degree and residual amount of plastic films. The PAEs content in soil with black films was higher than the US soil allowable criteria. High-throughput sequencing analysis showed that the addition of residual film significantly increased the alpha diversity of bacterial communities, changed the structure of bacterial community, and generated significant disturbances in bacterial function. Besides, the residual film recruited more microbiota related to plastic film and PAEs degradation. Results of the present study provide insight into the dynamic variation of soil PAEs caused by plastic film residue in one year, which is important to help evaluate the pollution risk of PAEs on soils and crops caused by residual plastic film.
塑料薄膜的广泛使用导致邻苯二甲酸酯（PAEs）的释放，这严重威胁着土壤环境和作物生产的安全。然而，目前尚不清楚塑料薄膜残留是否存在导致土壤中 PAEs 积累的最大阈值，田间条件下土壤 PAEs 的动态变化仍不清楚。为了解决这些问题，进行了田间试验，以研究田间塑料薄膜残留条件下土壤 PAEs 含量的时间波动和微生物群落结构的响应。结果表明，在一年的观测期内，土壤 PAEs 含量波动较大，冬季和夏季有周期性峰值，并且随着塑料薄膜老化程度和残留量的增加而加剧。黑色薄膜土壤中的 PAEs 含量高于美国土壤允许标准。高通量测序分析表明，残膜的添加显著增加了细菌群落的 alpha 多样性，改变了细菌群落的结构，并对细菌功能产生了显著干扰。此外，残膜还招募了更多与塑料薄膜和 PAEs 降解相关的微生物。本研究结果提供了对塑料薄膜残留引起的土壤 PAEs 在一年内的动态变化的深入了解，这对于帮助评估残留塑料薄膜对土壤和作物中 PAEs 造成的污染风险非常重要。
