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  

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

作　　者：陆丽霞 陈浩 王儒章 唐俊杰 杨世梅 刘冬冬 Lu Lixia;Chen Hao;Wang Ruzhang;Tang Junjie;Yang Shimei;Liu Dongdong(Colleage of Resource and Environment Engineering,Guizhou University,Guiyang,Guizhou 550000,China;Key Laboratory of Karst Geological Resources and Environment,Ministry of Education,Guiyang,Guizhou 550000,China)

机构地区：[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

出　　处：《水土保持通报》2025年第1期215-224,263,共11页Bulletin of Soil and Water Conservation

基　　金：国家自然科学基金地区基金项目“孔/裂隙水驱动下垦殖坝地土壤—表层岩溶带氮肥的快速流失机制”(42067004);贵州省优秀青年人才项目(黔科合平台人才-YQK[2023]005)。

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50μm)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_(r)),饱和含水量(θ_(s)),拟合参数(α),经验参数(n),土壤饱和导水率(K_(s))]。[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^(2)),效率系数(CE)>0.98]。(3)不同微塑料处理对土壤水力参数(θ_(r),θ_(s),α,n,K_(s))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。[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 50μm)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(θ_(r),θ_(s),α,n,K_(s))were inverted under different microplastic treatments using the Hydrus-1D model.[Results]①The 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.②All 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).③The effect of microplastic treatment on soil hydraulic parameters(θ_(r),θ_(s),α,n,K_(s))was insignificant,but the PS microplastic saturated hydraulic conductivity showed an increase with decreasing particle size.[Conclusion]The effects of PS,PP,and PE microplastics on soil infiltration processes were significantly different,and the Horton,cumulative infiltration,and Hydrus-1D mode

关 键 词：碳酸盐岩红土 水分入渗 微塑料 模型拟合 HYDRUS-1D模型 

分 类 号：S152.7[农业科学—土壤学] X53[农业科学—农业基础科学]