Influence of microplastic species and size on infiltration process and hydraulic parameters of carbonate lateritic soils

Lu Lixia; Chen Hao; Wang Ruzhang; Tang Junjie; Yang Shimei; Liu Dongdong

doi:10.13961/j.cnki.stbctb.2025.01.023

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Influence of microplastic species and size on infiltration process and hydraulic parameters of carbonate lateritic soils

- Influence of microplastic species and size on infiltration process and hydraulic parameters of carbonate lateritic soils
- Bulletin of Soiland Water Conservation Vol. 45, Issue 1, Pages: 215-224(2025)
- 作者机构：
  
  1. 贵州大学资源与环境工程学院,贵州,贵阳,550000
  2. 喀斯特地质资源与地质环境教育部重点实验室,贵州,贵阳,550000
- 作者简介：
- 基金信息：
- DOI：10.13961/j.cnki.stbctb.2025.01.023
  CLC： X53;S152.7
- Published：2025
- 稿件说明：
移动端阅览
Lu Lixia, Chen Hao, Wang Ruzhang, et al. Influence of microplastic species and size on infiltration process and hydraulic parameters of carbonate lateritic soils[J]. Bulletin of Soiland Water Conservation, 2025, 45(1): 215-224.
DOI：

Lu Lixia, Chen Hao, Wang Ruzhang, et al. Influence of microplastic species and size on infiltration process and hydraulic parameters of carbonate lateritic soils[J]. Bulletin of Soiland Water Conservation, 2025, 45(1): 215-224. DOI： 10.13961/j.cnki.stbctb.2025.01.023.

摘要

[目的

]

探究微塑料种类和尺寸对碳酸盐岩红土入渗过程的影响，为进一步揭示微塑料污染农田土壤的水文过程提供新的数据支撑。[方法

]

通过室内扁平土柱入渗模拟试验，采用定水头垂直入渗方法，研究了不同粒径(550，150和50 μm)的聚乙烯(PE)、聚丙烯(PP)、聚苯乙烯(PS)微塑料对红土入渗速率、累积入渗量和湿润锋深度的影响，同时评价累积入渗模型、Philip模型、Horton模型和Kostiakov模型在入渗过程中的适用性，再利用Hydrus-1D模型反演了不同微塑料处理下的5项水力参数〔残余含水量(θ

)，饱和含水量(θ

)，拟合参数(α)，经验参数(n)，土壤饱和导水率(K

)〕。[结果

]

①随着粒径的减小，PS微塑料的入渗速率、累积入渗量增大，而PE和PP微塑料的累积入渗量、入渗速率随粒径的增大先增大后减小，且不同粒径的累积入渗量差异显著(p＜0.05)；PS微塑料对水分的运移先促进后抑制，而PP与PE都起到促进水分运移的作用。②所有模型均适用于含微塑料红土的入渗模拟，其中Horton模型和累积入渗模型表现最佳〔决定系数(R

)，效率系数(CE)＞0.98〕。③不同微塑料处理对土壤水力参数(θ

，θ

，α，n，K

)的影响不显著，但PS微塑料饱和导水率随粒径的减小而增加。[结论

]

PS，PP，PE微塑料对土壤入渗过程的影响存在明显差异，Horton模型、累积入渗模型以及Hydrus-1D模型均表现出较高的适用性。

Abstract

[Objective] The effects of microplastic type and size on the infiltration process of carbonatite laterite soils was investigated in order to provide new data revealing the hydrological processes of microplastic-contaminated agricultural soils. [Methods] The effects of polyethylene (PE)

polypropylene (PP)

and polystyrene (PS) microplastics with different particle sizes (550

150

and 50 μm) on the infiltration rate

cumulative infiltration

and the depth of the wetting front of the lateritic soil were investigated by an indoor simulation of infiltration into a flattened soil column using a fixed-head vertical infiltration method. The effects of the cumulative infiltration

Philip

Horton

and Kostiakov models on the infiltration rate of the lateritic soil

cumulative infiltration

and the depth of the wetting front were also evaluated. The five hydraulic parameters (θr

θs

Ks) were inverted under different microplastic treatments using the Hydrus-1D model. [Results] ① The infiltration rate and cumulative infiltration of PS microplastics increased with decreasing particle size

while the cumulative infiltration and infiltration rate of PE and PP microplastics increased and then decreased with increasing particle size

and the differences in cumulative infiltration between different particle sizes were significant (p＜0.05); PS microplastics facilitated and then inhibited water transport

while both PP and PE played the role of facilitating water transport. ② All models were applicable to the infiltration simulation of microplastic-containing laterite soils

with Horton’s model and the cumulative infiltration model performing the best (R2

CE > 0.98). ③ The effect of microplastic treatment on soil hydraulic parameters (θr

θs

Ks) was insignificant

but the PS microplastic saturated hydraulic conductivity showed an increase with decreasing particle size. [Conclusion] The effects of PS

and PE microplastics on soil infiltration processes were significantly different

and the Horton

cumulative infiltration

and Hydrus-1D models showed high applicability.

关键词

Keywords

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