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Effects of microplastics on soil properties: Current knowledge and future perspectives
Summary
This review examines how microplastics affect soil health, including changes to soil structure, chemistry, and the microbial communities that keep soil fertile. The effects vary depending on the type, shape, and amount of plastic present, but in many cases microplastics alter nutrient availability and can even influence greenhouse gas emissions from soil. These changes could threaten crop productivity and food safety, since microplastics are now found in agricultural soils worldwide.
Microplastics (MPs) are a type of emerging contaminants that pose a potential threat to global terrestrial ecosystems, including agroecosystems. In recent years, MPs in soil and their adverse effects on soil health and fertility have attracted increasing concern. Based on the current knowledge, this review begins with a summary of the occurrence and characteristics of MPs in various soil environments, and then highlights the impacts of MPs on soil physical, chemical, and microbiological properties. Data show that MPs occur widely in all surveyed soil types, such as agricultural soils, industrial soils, urban soils, and unused soils, but show variation in their abundance, type, shape, and size. In most cases, MPs can change soil physical, chemical, and microbiological properties, but the effects vary, and are dependent on polymer type, shape, dose, and size. MPs-induced changes in soil fertility and the availability of pollutants may pose a potential threat to plant performance and crop productivity and safety. Particularly, MPs influence the emission of greenhouse gases from soil, ultimately leading to uncertain consequences for global climate change. More comprehensive and in-depth studies are required to fill large knowledge gaps.