Responses of lettuce (Lactuca sativa L.) growth and soil properties to conventional non-biodegradable and new biodegradable microplastics
文献类型: 外文期刊
第一作者: Wang, Weixuan
作者: Wang, Weixuan;Xie, Yingmei;Li, Han;Dong, Hongmin;Li, Bin;Guo, Yunjie;Wang, Yutong;Guo, Xinrui;Yin, Tao;Zhou, Weiwei;Liu, Xiaowei
作者机构:
关键词: Microplastics; Poly(butylene adipate; co -terephthalate); Polyethylene; Soil -plant system; Lettuce
期刊名称:ENVIRONMENTAL POLLUTION ( 影响因子:8.9; 五年影响因子:9.5 )
ISSN: 0269-7491
年卷期: 2024 年 341 卷
页码:
收录情况: SCI
摘要: Residual plastic films in soils are posing a potential threat to agricultural ecosystem. However, little is known about the impacts of microplastics (MPs) derived from biodegradable and non-biodegradable plastic films on plant-soil systems. Here, we carried out a pot experiment using soil-cultivated lettuce treated by two types of MPs, degradable poly(butylene adipate-co-terephthalate) (PBAT-MPs) and non-biodegradable polyethylene (PE -MPs). MPs resulted in different degrees of reduction in shoot biomass, chlorophyll content, photosynthetic pa-rameters, and leaf contents of nitrogen (N), phosphorus (P), and potassium (K), accelerated accumulation of hydrogen peroxide and superoxide, and increased malondialdehyde content in lettuce leaves. Moreover, MPs obviously decreased contents of total N, nitrate, ammonium, and available K in soils, and increased available P, thus altering soil nutrient availability. MPs also significantly decreased proportions of macroaggregates, and decreased soil electrical conductivity and microbial activity. PBAT-MPs had significantly greater impacts on oxidative damage, photosynthetic rate, soil aggregation, microbial activity, and soil ammonium than those of PE -MPs. Our results suggested that MPs caused oxidative damages, nutrient uptake inhibition, soil properties alteration, ultimately leading to growth reduction, and PBAT-MPs exhibited stronger impacts. Therefore, it is urgent to further study the ecological effects of MPs, especially biodegradable MPs, on soil-plant systems.
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