微塑料种类和尺寸对碳酸盐岩红土入渗过程及水力参数的影响
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贵州大学

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(42067004);贵州省优秀青年人才项目(黔科合平台人才-YQK[2023]005);贵州省水利科技经费项目(KT201803)


Influence of microplastic species and size on the infiltration process and hydraulic parameters of carbonate lateritic soils
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    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,研究不同粒径(550μm、150μm和50μm)的聚乙烯PE、聚丙烯PP、聚苯乙烯PS微塑料的入渗速率、累积入渗量和湿润锋深度和随入渗时间的变化,并进一步评价了累积入渗模型、Philip模型、Horton模型和Kostiakov模型对含微塑料的碳酸盐岩红土的适用性,以及利用实测数据在Hydrus-1D模型中的反演板块来推求不同微塑料处理下的五项水力参数(θr、θs、α、n、Ks)。[结果] ①PS微塑料的入渗速率、累积入渗量均随粒径的减小而增大,PE和PP微塑料的累积入渗量、入渗速率则随粒径的增大表现为先增大后减小,其中不同粒径大小的累积入渗量差异显著(P<0.05);在湿润锋深度推进上,PS会从促进水分往土壤深部运移转为阻碍水分的深层运移,而PP与PE都起到促进水分运移的作用。②在模型适用性方面,根据评价指标,所有模型均表现出良好的适用性,其中Horton模型和累积入渗模型适用性相较最高,R2、CE均大于0.98,RRMSE均值为0.10。③在五项水力参数的推求方面,θr、θs、α、n、Ks在各处理之间仅存在细微差异, 其中值得注意的是PS微塑料饱和导水率呈现随粒径的减小而增大的趋势。[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,为类似土壤情况下的水力参数范围提供了新的数据参考。

    Abstract:

    [Objective] To investigate the effects of microplastic types and sizes on the infiltration process of carbonatite laterite soils, and to provide new data support for further revealing the hydrological processes of microplastic-contaminated agricultural soils. [Methods] The infiltration rate, cumulative infiltration and depth of wetting front and changes with infiltration time of polyethylene PE, polypropylene PP and polystyrene PS microplastics with different particle sizes (550μm, 150μm and 50μm) were investigated by indoor flat soil column infiltration simulation tests using a fixed-head vertical infiltration method, and further evaluated with the cumulative infiltration model, Philip's model, Horton model and Kostiakov model for carbonatite laterites containing microplastics, as well as utilizing the inverse slabs of measured data in the Hydrus-1D model to derive five hydraulic parameters (θr、θs、α、n、Ks)under different microplastic treatments. [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 showed first increase and then decrease with increasing particle size, in which the difference of cumulative infiltration between different particle sizes was significant (P<0.05); in terms of the advancement of the depth of wetting fronts, PS would switch from promoting the water transport toward the deeper part of the soil to impeding the deeper water In terms of wetting front depth advancement, PS would switch from promoting water transport to deep soil to hindering deep water transport, while both PP and PE acted to promote water transport. ② In terms of model applicability, according to the evaluation indexes, all models showed good applicability, among which the Horton model and the cumulative infiltration model had the highest applicability, with R2 and CE greater than 0.98, and the average value of RRMSE was 0.10. ③ In terms of the derivation of the five hydraulic parameters, θr, θs, α, n, and Ks showed only slight differences among treatments, among which the noteworthy ones were Among them, it is noteworthy that the saturated hydraulic conductivity of PS microplastics showed a tendency to increase with the decrease of particle size. [Conclusions] The effects of PS, PP, and PE microplastics on soil infiltration processes were significantly different, and the Horton model, cumulative infiltration model, and Hydrus-1D model showed high applicability, which provided new data references for the range of hydraulic parameters in similar soil conditions.

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  • 收稿日期:2024-06-18
  • 最后修改日期:2024-10-19
  • 录用日期:2024-10-21
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