Response of soybean and maize roots and soil enzyme activities to biodegradable microplastics contaminated soil

文献类型： 外文期刊

第一作者： Yu, Yao

作者： Yu, Yao;Yang, Xiaomei;Yu, Yao;Wang, Yan;Tang, Darrell W. S.;Yang, Xiaomei;Geissen, Violette;Chen, Yanhua;Xue, Sha;Liu, Mengjuan

作者机构：

关键词： Biodegradable plastic; Microplastics; Plant root; Enzyme activities

期刊名称：ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY （ 影响因子：6.8； 五年影响因子：6.9 ）

ISSN： 0147-6513

年卷期： 2023 年 262 卷

页码：

收录情况： SCI

摘要： Although biodegradable plastic film is a promising alternative product for reducing polyethylene plastic pollu-tion in agricultural soils, the effects of its residues on plant growth and soil properties remain unclear. In this study, we conducted an experiment to investigate root properties and soil enzyme activities in Poly (butylene adipate-co-terephthalate) microplastics (PBAT-MPs) contaminated soil (0 % (CK), 0.1 %, 0.2 %, 0.5 % and 1 % of dry soil weight) with soybean (Glycine max (Linn.) Merr.) and maize (Zea mays L.). The results show that PBAT-MP accumulation in soil negatively affects root growth, and alter soil enzyme activities, which may then constrain C/N cycling and potential yields. For soybean, the total root length, total root surface area and root biomass decreased by 34 %-58 %, 34 %-54 % and 25 %-40 % at the harvesting stage compared to CK, respectively. The negative effects of PBAT-MPs on maize roots were greater than on soybean roots. The total root length, root surface area and root biomass of maize decreased by 37 %-71 %, 33 %-71 % and 24 %-64 % at the tasseling and harvesting stage, respectively (p < 0.05). Furthermore, a statistical analysis of the data in-dicates that the inhibition of soybean and maize root growth by PBAT-MP accumulation was mediated by the significantly different impacts of PBAT-MP addition on C-enzyme (8-xylosidase, cellobiohydrolase, 8-glucosidase) and N-enzyme activities (leucine-aminopeptidase, N-acetyl-8-glucosaminidase, alanine aminotransferase) in rhizosphere and non-rhizosphere soil, possibly due to interactions with plant-specific root exudates and micro-bial communities. These findings show the potential risks posed by biodegradable microplastics on the plant-soil system, and suggest that biodegradable plastic film should be applied with caution.

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