长期施用有机堆肥后温室土壤剖面中微塑料的污染特征

IF 12.4 Q1 ENVIRONMENTAL SCIENCES
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引用次数: 0

摘要

有机堆肥是土壤中微塑料(MP)污染的重要来源,其在温室农业中的投入量远高于露地农业。然而,长期施用堆肥如何影响温室土壤剖面中的微塑料污染仍不清楚。本研究考察了鸡粪堆肥和蚯蚓中 MPs 的特性,通过一项为期 15 年的温室实验,探讨了堆肥的长期施用对 0-100 厘米土壤深度中 MPs 累积和垂直迁移的影响。堆肥中的微塑料丰度为3965个/千克-1,堆肥改良土壤中的微塑料丰度为191-248个/千克-1,堆肥改良土壤中蚯蚓的微塑料丰度为2.73-4.52个/条-1;后两者随着堆肥的施用而显著增加,并明显高于未改良土壤。长期堆肥改良土壤积累的 MPs 占总数的 45.4%。堆肥中 2 mm 的微塑料比例(49.7%)低于堆肥改良土壤(65.5%)和蚯蚓(65.4%)。随着土壤深度的增加,微塑料的大小和丰度都在下降。堆肥、堆肥改良土壤和蚯蚓中的微塑料聚合物类型和形状具有相似性,主要包括聚乙烯和聚丙烯碎片和纤维。土壤中堆肥衍生的多孔材料表现出复杂的风化形态,并附着在矿物胶体上。因此,源于堆肥的土壤MPs会逐渐风化降解成更小的颗粒,并迁移到更深的土壤中,可能会导致更严重的生态问题。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Pollution characteristics of microplastics in greenhouse soil profiles with the long-term application of organic compost

Pollution characteristics of microplastics in greenhouse soil profiles with the long-term application of organic compost

Organic composts are significant sources of microplastic (MP) pollution in soils, and their input is much higher in greenhouse agriculture than open-field agriculture. However, how long-term compost application affects MPs pollution in greenhouse soil profiles remains unclear. This study examined MPs characteristics in chicken manure compost and earthworms, exploring the long-term impacts of compost application on MPs accumulation and vertical migration in 0–100 cm soil depth through a 15-year greenhouse experiment. Microplastics abundance was 3965 items kg1 in compost, 191–248 items kg1 in compost-amended soils, and 2.73–4.52 items individual1 in earthworms from compost-amended soils; the latter two increased significantly with compost application and were significantly higher than unamended soils. Soil MPs accumulation from long-term compost amendment contributed 45.4% of the total. The proportion of MPs <2 mm in compost (49.7%) was less than in compost-amended soils (65.5%) and earthworms (65.4%). Microplastics size and abundance decreased with increasing soil depth. Microplastics polymer types and shapes in composts, compost-amended soils, and earthworms exhibited similarities, mainly including polyethylene and polypropylene fragments and fibers. Compost-derived MPs in soils exhibited complex weathering morphology and adhered to mineral colloids. Therefore, soil MPs originating from compost gradually weathered and degraded into smaller particles and migrated to deeper soil, maybe resulting in more serious ecological issues.

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来源期刊
Resources Environment and Sustainability
Resources Environment and Sustainability Environmental Science-Environmental Science (miscellaneous)
CiteScore
15.10
自引率
0.00%
发文量
41
审稿时长
33 days
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