| 吉恒莹,杨明瑶,李磐.不同粒径棉秆生物炭对聚乙烯微塑料污染土壤水分与溶质运移特性的影响[J].农业环境科学学报,2025,44(11):2946-2955. |
| 不同粒径棉秆生物炭对聚乙烯微塑料污染土壤水分与溶质运移特性的影响 |
| Impact of varying particle sizes of cotton stalk biochar on water and solute movement in soil contaminated with polyethylene microplastics |
| 投稿时间：2024-12-02 |
| DOI：10.11654/jaes.2024-1046 |
| 中文关键词: 聚乙烯微塑料 棉秆生物炭 土壤水分入渗 溶质运移 孔隙结构 |
| 英文关键词: polyethylene microplastics cotton stalk biochar soil water infiltration solute transport pore structure |
| 基金项目:新疆维吾尔自治区自然科学基金项目（2022D01A96） |
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| 中文摘要: |
| 为探究生物炭对微塑料污染土壤的修复效果，采用土柱实验，探讨了不同粒径（<0.15 mm和0.15~1 mm）的棉秆生物炭对聚乙烯（PE）微塑料污染土壤的水分入渗和溶质运移特性的影响。通过扫描电镜和比表面积测定仪分析，表征了不同处理组的形貌特征和孔隙结构；采用Philip模型和对流弥散方程分析了水分入渗和溶质运移规律。结果表明：PE污染导致土壤初始入渗速率降低32.98%（至0.65 cm·min-1），饱和导水率增加114.3%（至0.45 cm·h-1），显著改变了土壤水文特性。添加生物炭后，0.15~1 mm粒级组分形成了更稳定的孔隙结构，其微孔体积（0.001 814 cm3·g-1）高于<0.15 mm生物炭处理（0.000 957 cm3·g-1）。在PE污染土壤中，0.15~1 mm生物炭处理使初始入渗速率降至1.15 cm·min-1，饱和导水率降至0.06 cm·h-1，溶质穿透初始时间延长至580 min。研究表明，0.15~1 mm生物炭通过形成稳定的孔隙结构改善了PE污染土壤的水分运移和溶质运移特性。 |
| 英文摘要: |
| To investigate the remediation effects of biochar on microplastic-contaminated soil, this study utilized a soil column experiment to assess the impacts of cotton stalk biochar with varying particle sizes（<0.15 mm and 0.15-1 mm）on the infiltration and solute transport characteristics of soil contaminated with polyethylene（PE）microplastics. The morphological characteristics and pore structures of the different treatment groups were characterized using scanning electron microscopy（SEM）and Brunauer-Emmett-Teller（BET）analysis. The infiltration and solute transport patterns were evaluated using the Philip model and the convection-dispersion equation. The results demonstrated that PE contamination reduced the initial infiltration rate of the soil by 32.98%（to 0.65 cm·min-1）and increased the saturated hydraulic conductivity by 114.3%（to 0.45 cm·h-1）, thereby significantly altering the soil's hydrological properties. The addition of biochar improved the soil structure, with the 0.15-1 mm particle size group exhibiting a more stable pore structure and a higher micropore volume（0.001 814 cm3·g-1）compared to the <0.15 mm particle size group（0.000 957 cm3·g-1）. In PE-contaminated soils, the incorporation of 0.15-1 mm biochar decreased the initial infiltration rate to 1.15 cm·min-1 and reduced the saturated hydraulic conductivity to 0.06 cm· -1, while extending the initial solute breakthrough time to 580 minutes. These findings indicate that biochar particles within the 0.15-1 mm size range effectively enhance water and solute transport characteristics in PE-contaminated soils through the development of stable pore networks. |
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