Effect of polylactic acid microplastics on soil properties, soil microbials and plant growth

微塑料 聚乳酸 生物可分解塑胶 微生物种群生物学 生态系统 农学 化学 生物 环境化学 生态学 细菌 有机化学 遗传学 聚合物
作者
Run Liu,Jiawen Liang,Yinghui Yang,Han Jiang,Xingjun Tian
出处
期刊:Chemosphere [Elsevier]
卷期号:329: 138504-138504 被引量:54
标识
DOI:10.1016/j.chemosphere.2023.138504
摘要

Biodegradable plastic is considered one of the most promising alternatives to agricultural mulch. However, the impact of biodegradable microplastics on agricultural ecosystems is still lacking. We conducted a controlled experiment with polylactic acid microplastics (PLA MPs) to examine the effects of biodegradable plastic on soil properties, corn growth, the microbial community and hotspots of enzyme activity. The results showed that PLA MPs in soil significantly reduced the soil pH value but increased the soil C:N ratio. High levels of PLA MPs significantly reduced the biomass of plant shoots and roots as well as chlorophyll, leaf C and N and root N contents. PLA MPs increased bacterial abundance but decreased the abundance of dominant fungal taxa. As the level of PLA MPs increased, the soil bacterial community structure became more complex, while the fungal community became more singular. The results of the in situ zymogram showed that low levels of PLA MPs increased the hotspots of enzyme activity. The effect of PLA MPs on enzyme activity hotspots was regulated by a combination of soil properties and microbial diversity. Generally, the addition of PLA MPs at high concentrations will have a negative impact on soil characteristics, soil microbials and plant growth in a short period of time. Therefore, we should be aware of the potential risks of biodegradable plastic to agricultural ecosystems.
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