数字农科院2.0

Do Added Microplastics, Native Soil Properties, and Prevailing Climatic Conditions Have Consequences for Carbon and Nitrogen Contents in Soil? A Global Data Synthesis of Pot and Greenhouse Studies

文献类型： 外文期刊

作者： Shahid Iqbal;Jianchu Xu;Muhammad Saleem Arif;Fiona R. Worthy;Davey L. Jones;Sehroon Khan;Sulaiman Ali Alharbi;Ekaterina Filimonenko;Sadia Nadir;Dengpan Bu;Awais Shakoor;Heng Gui;Douglas Allen Schaefer;Yakov Kuzyakov

作者机构：

关键词： ecosystem response;emerging pollutant;nutrient cycling;soil health;soil organic matter

期刊名称： Environmental Science and Technology

ISSN： 0013-936X

年卷期： 2024 年 58 卷 19 期

页码：

收录情况： SCIE（2024版） ; ; EI（2024版）

摘要： Microplastics threaten soil ecosystems, strongly influencing carbon (C) and nitrogen (N) contents. Interactions between microplastic properties and climatic and edaphic factors are poorly understood. We conducted a meta-analysis to assess the interactive effects of microplastic properties (type, shape, size, and content), native soil properties (texture, pH, and dissolved organic carbon (DOC)) and climatic factors (precipitation and temperature) on C and N contents in soil. We found that low-density polyethylene reduced total nitrogen (TN) content, whereas biodegradable polylactic acid led to a decrease in soil organic carbon (SOC). Microplastic fragments especially depleted TN, reducing aggregate stability, increasing N-mineralization and leaching, and consequently increasing the soil C/N ratio. Microplastic size affected outcomes; those <200 μm reduced both TN and SOC contents. Mineralization-induced nutrient losses were greatest at microplastic contents between 1 and 2.5% of soil weight. Sandy soils suffered the highest microplastic contamination-induced nutrient depletion. Alkaline soils showed the greatest SOC depletion, suggesting high SOC degradability. In low-DOC soils, microplastic contamination caused 2-fold greater TN depletion than in soils with high DOC. Sites with high precipitation and temperature had greatest decrease in TN and SOC contents. In conclusion, there are complex interactions determining microplastic impacts on soil health. Microplastic contamination always risks soil C and N depletion, but the severity depends on microplastic characteristics, native soil properties, and climatic conditions, with potential exacerbation by greenhouse emission-induced climate change.

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