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Unveiling the hidden impact: How biodegradable microplastics influence CO 2 and CH 4 emissions and Volatile Organic Compounds (VOCs) profiles in soil ecosystems

文献类型： 外文期刊

作者： Wang, Yihao 1 ; Zhao, Chunjiang 1 ; Lu, Anxiang 1 ; Dong, Daming 1 ; Gong, Wenwen 1 ;

作者机构： 1.Beijing Acad Agr & Forestry Sci, Beijing 100097, Peoples R China

2.Jiangsu Univ, Sch Agr Engn, Zhenjiang 212013, Peoples R China

关键词： Biodegradable microplastics; Paddy and upland soils; Greenhouse gases; Volatile Organic Compounds; Optical gas sensor

期刊名称：JOURNAL OF HAZARDOUS MATERIALS （ 影响因子：13.6； 五年影响因子：12.7 ）

ISSN： 0304-3894

年卷期： 2024 年 471 卷

页码：

收录情况： SCI

摘要： Biodegradable plastics promise eco-friendliness, yet their transformation into microplastics (bio-MPs) raises environmental alarms. However, how those bio-MPs affect the greenhouse gases (GHGs) and volatile organic compounds (VOCs) in soil ecosystems remains largely unexplored. Here, we investigated the effects of diverse bio-MPs (PBAT, PBS, and PLA) on GHGs and VOCs emission in typical paddy or upland soils. We monitored the carbon dioxide (CO 2 ) and methane (CH 4 ) fluxes in -situ using the self -developed portable optical gas sensor and analyzed VOC profiles using a proton -transfer reaction mass spectrometer (PTR-MS). Our study has revealed that, despite their biodegradable nature, bio-MPs do not always promote soil GHG emissions as previously thought. Specifically, PBAT and PLA significantly increased CO 2 and CH 4 emissions up to 1.9 -7.5 and 115.9 -178.5 fold, respectively, compared to the control group. While PBS exhibited the opposite trend, causing a decrease of up to 39.9% for CO 2 and up to 39.9% for CH 4 . In addition, different types of bio-MPs triggered distinct soil VOC emission patterns. According to the Mann -Whitney U -test and Partial Least Squares Discriminant Analysis (PLSDA), a recognizable VOC pattern associated with different bio-MPs was revealed. This study claims the necessity of considering polymer -specific responses when assessing the environmental impact of Bio-MPs, and providing insights into their implications for climate change.

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