Department of Biology, University of Naples Federico II, Via Cinthia, 80126 Naples, Italy.
BAT Center-Center for Studies on Bioinspired Agro-Environmental Technology, 80126 Naples, Italy.
Int J Environ Res Public Health. 2022 Aug 4;19(15):9610. doi: 10.3390/ijerph19159610.
Plastic sheets are widely used in farming soil to improve the productivity of cultures. Due to their absorption capacity, plastic sheets can alter element and metal content in soils, and in turn affect soil properties. The use of biodegradable films is an attractive eco-sustainable alternative approach to overcome the environmental pollution problems due to the use of plastic films but their impacts on soil are scarcely studied. The aim of the research was to evaluate the impact of conventional plastic and bioplastic sheets on total and available concentrations of elements (Al, Ca, Cu, Fe, K, Mg, Mn, Na, Ni, Pb, and Zn) in soils. The research was performed in mesocosm trials, filled with soil covered by conventional plastic and bioplastic sheets. After six months of exposure, soils were characterized for pH, water content, concentrations of organic and total carbon and total nitrogen, and total and available Al, Ca, Cu, Fe, K, Mg, Mn, Na, Ni, Pb, and Zn element concentrations. The results highlighted that soils covered by bioplastic sheets showed higher total and available concentrations of elements and higher contamination factors, suggesting that bioplastic sheets represented a source of metals or a less-effective sink to these background metals in soils, compared to conventional plastic ones.
塑料薄膜在农业土壤中被广泛用于提高作物的生产力。由于其吸收能力，塑料薄膜会改变土壤中的元素和金属含量，并进而影响土壤性质。使用可生物降解薄膜是一种有吸引力的生态可持续替代方法，可以克服由于使用塑料薄膜而导致的环境污染问题，但它们对土壤的影响却很少被研究。本研究旨在评估常规塑料和生物塑料薄膜对土壤中元素（Al、Ca、Cu、Fe、K、Mg、Mn、Na、Ni、Pb 和 Zn）的总量和有效浓度的影响。该研究在填充有土壤的中观试验中进行，土壤表面覆盖有常规塑料和生物塑料薄膜。暴露六个月后，对土壤的 pH 值、含水量、有机碳和总碳以及总氮浓度以及总和有效 Al、Ca、Cu、Fe、K、Mg、Mn、Na、Ni、Pb 和 Zn 元素浓度进行了表征。结果表明，覆盖生物塑料薄膜的土壤表现出更高的元素总量和有效浓度以及更高的污染因子，表明与常规塑料相比，生物塑料薄膜代表了土壤中这些背景金属的金属源或效率较低的汇。
