College of Soil and Water Conservation Science and Engineering, Northwest A&F University, Yangling 712100, China; School of Environment, Tsinghua University, Beijing 100084, China.
College of Soil and Water Conservation Science and Engineering, Northwest A&F University, Yangling 712100, China.
J Hazard Mater. 2024 Dec 5;480:136353. doi: 10.1016/j.jhazmat.2024.136353. Epub 2024 Oct 29.
Plastic film mulching is an important agricultural practice, but its release of phthalic acid esters (PAEs) poses threats to soil and human health. However, the migration patterns of PAEs during the lifecycle of mulch plastic film (MPF) remain unclear. This study aims to explore the temporal patterns of release of PAEs during the MPF's lifecycle and evaluate the migration patterns of PAEs from MPF in the soil-plant-atmosphere continuum (SPAC) system through pot experiments and model simulations. The results reveal that during the mulching period, 44.90-56.71 % of the PAEs released went into the atmosphere and 14.97-18.90 % into the soil, while during the residual film period, 24.39-40.13 % were slowly released into the soil. Elevated soil water content increased maize transpiration rates, leading to higher concentrations of PAEs in roots, stems, and fruits, but lower concentrations in leaves. In 2020, the estimated total release of PAEs from MPF in northwest China amounted to 35.42 tons. Notably, PAEs predominantly accumulated in the soil, with minimal accumulation in plant tissues. Moreover, PAEs were primarily removed through degradation. Our results elucidate the migration patterns of PAEs from MPF in the SPAC system, facilitating the evaluation of PAE pathways into the human food chain.
塑料薄膜覆盖是一种重要的农业实践，但它释放的邻苯二甲酸酯（PAEs）对土壤和人类健康构成威胁。然而，地膜生命周期中 PAEs 的迁移模式仍不清楚。本研究旨在通过盆栽实验和模型模拟，探讨 MPF 生命周期中 PAEs 释放的时间模式，并评估 SPAC 系统中 PAEs 从 MPF 向土壤-植物-大气连续体（SPAC）的迁移模式。结果表明，在覆盖期，44.90-56.71%的 PAEs 释放到大气中，14.97-18.90%释放到土壤中，而在残膜期，24.39-40.13%缓慢释放到土壤中。土壤水分含量的增加会提高玉米的蒸腾速率，导致根系、茎和果实中 PAEs 的浓度升高，但叶片中的浓度降低。2020 年，中国西北地区估计从 MPF 中释放的 PAEs 总量为 35.42 吨。值得注意的是，PAEs 主要积累在土壤中，在植物组织中的积累很少。此外，PAEs 主要通过降解去除。我们的研究结果阐明了 SPAC 系统中 PAEs 从 MPF 的迁移模式，有助于评估 PAE 进入人类食物链的途径。
