Effects of Polyethylene and Poly (butyleneadipate-co-terephthalate) contamination on soil respiration and carbon sequestration

IF 7.6 2区环境科学与生态学 Q1 ENVIRONMENTAL SCIENCES

Environmental Pollution Pub Date : 2024-11-20 DOI:10.1016/j.envpol.2024.125315

Mengyu Liu, Yao Yu, Ying Liu, Sha Xue, Darrell W.S. Tang, Xiaomei Yang

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引用次数: 0

Abstract

To address plastic pollution in agricultural soils due to polyethylene plastic film mulch used, biodegradable film is being studied as a promising alternative material for sustainable agriculture. However, the impact of biodegradable and polyethylene microplastics on soil carbon remains unclear. The field experiment was conducted with Poly (butyleneadipate-co-terephthalate) debris (PBAT-D, 0.5-2 cm), low-density polyethylene debris (LDPE-D, 0.5-2 cm) and microplastic (LDPE-Mi, 500-1000 μm) contaminated soil (0% (control), 0.05%, 0.1%, 0.2%, 0.5%, 1% and 2% w:w) planted with soybean, to explore potential impacts on soil respiration (Rs), soil organic carbon (SOC) and carbon fractions (microbial biomass carbon (MBC), dissolved organic carbon (DOC), easily oxidizable carbon (EOC), particulate organic carbon (POC), mineral-associated organic carbon (MAOC)), and C-enzymes (β-glucosidase, β-xylosidase, cellobiohydrolase). Results showed that PBAT-D, LDPE-D and LDPE-Mi significantly inhibited Rs compared with the control during the flowering and harvesting stages (p<0.05). SOC significantly increased in the PBAT-D treatments at both stages, and in the LDPE-Mi treatments at the harvesting stage, but decreased in the LDPE-D treatments at the flowering stage. In the PBAT-D treatments, POC increased but DOC and MAOC decreased at both stages. In the LDPE-D treatments, MBC, DOC and EOC significantly decreased but POC increased at both stages. In the LDPE-Mi treatments, MBC and DOC significantly decreased at the harvesting stage, while EOC and MAOC decreased but POC increased at the flowering stage. For C-enzymes, no significant inhibition was observed at the flowering stage, but they were significantly inhibited in all treatments at the harvesting stage. It is concluded that PBAT-D facilitates soil carbon sequestration, which may potentially alter the soil carbon pool and carbon emissions. The key significance of this study is to explore the overall effects of different forms of plastic pollution on soil carbon dynamics, and to inform future efforts to control plastic pollution in farmlands.

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聚乙烯和聚（丁烯二酸酯-共对苯二甲酸酯）污染对土壤呼吸和固碳的影响

为了解决农业土壤中因使用聚乙烯塑料薄膜覆盖物而造成的塑料污染问题，人们正在研究生物可降解薄膜，将其作为一种有前途的可持续农业替代材料。然而，生物可降解塑料和聚乙烯微塑料对土壤碳的影响仍不清楚。现场实验采用了聚对苯二甲酸丁二酯残片（PBAT-D，0.5-2 厘米）、低密度聚乙烯残片（LDPE-D，0.5-2 厘米）和微塑料（LDPE-Mi，500-1000 μm）污染土壤（0%（对照）、0.05%、0.1%、0.2%、0.结果表明，与对照相比，PBAT-D、LDPE-D 和 LDPE-Mi 在开花期和采收期显著抑制 Rs（p<0.05）。PBAT-D 处理的 SOC 在两个阶段都明显增加，LDPE-Mi 处理的 SOC 在收获阶段明显增加，但 LDPE-D 处理的 SOC 在开花阶段减少。在 PBAT-D 处理中，两个阶段的 POC 都有所增加，但 DOC 和 MAOC 都有所减少。在 LDPE-D 处理中，MBC、DOC 和 EOC 显著下降，但 POC 在两个阶段都有所上升。在 LDPE-Mi 处理中，收获期的 MBC 和 DOC 显著减少，而开花期的 EOC 和 MAOC 减少，但 POC 增加。至于 C 酶，在开花期没有观察到明显的抑制作用，但在收获期，所有处理都有明显的抑制作用。结论是，PBAT-D 有助于土壤固碳，有可能改变土壤碳库和碳排放。本研究的重要意义在于探索不同形式的塑料污染对土壤碳动态的总体影响，为今后控制农田塑料污染提供参考。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Environmental Pollution 环境科学-环境科学

CiteScore

16.00

自引率

6.70%

发文量

2082

审稿时长

2.9 months

期刊介绍： Environmental Pollution is an international peer-reviewed journal that publishes high-quality research papers and review articles covering all aspects of environmental pollution and its impacts on ecosystems and human health. Subject areas include, but are not limited to: • Sources and occurrences of pollutants that are clearly defined and measured in environmental compartments, food and food-related items, and human bodies; • Interlinks between contaminant exposure and biological, ecological, and human health effects, including those of climate change; • Contaminants of emerging concerns (including but not limited to antibiotic resistant microorganisms or genes, microplastics/nanoplastics, electronic wastes, light, and noise) and/or their biological, ecological, or human health effects; • Laboratory and field studies on the remediation/mitigation of environmental pollution via new techniques and with clear links to biological, ecological, or human health effects; • Modeling of pollution processes, patterns, or trends that is of clear environmental and/or human health interest; • New techniques that measure and examine environmental occurrences, transport, behavior, and effects of pollutants within the environment or the laboratory, provided that they can be clearly used to address problems within regional or global environmental compartments.