| 王志超,倪嘉轩,张博文,杨文焕,李卫平.聚氯乙烯微塑料对土壤水分特征曲线的影响及模拟研究[J].农业环境科学学报,2022,41(5):983-989. |
| 聚氯乙烯微塑料对土壤水分特征曲线的影响及模拟研究 |
| Simulation study to determine the influence of polyvinyl chloride microplastics on the soil water characteristic curve |
| 投稿时间：2021-09-17 |
| DOI：10.11654/jaes.2021-1078 |
| 中文关键词: 聚氯乙烯 微塑料 土壤水分特征曲线 模型分析 |
| 英文关键词: polyvinyl chloride microplastic soil water characteristic curve model analysis |
| 基金项目:国家自然科学基金项目（42007119） |
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| 中文摘要: |
| 为探究不同丰度（土壤干质量的0.5％、1％、2％）及不同粒径（150、550、950 μm）微塑料对土壤水分特征曲线的影响，设置10组不同处理，通过压力薄膜仪测定各处理的土壤水分特征曲线，并应用RETC软件结合各曲线模拟值对van Genuchten模型、Brooks-Corey模型等常用土壤水分特征曲线模型进行适用性评价。结果表明：相比于微塑料丰度为0.5％的处理，丰度为1.0％和2.0％的微塑料赋存条件下，随着土壤水吸力的增大，对应的土壤含水率减小的程度也增大；微塑料丰度为2.0％时的3组不同粒径处理的土壤含水率下降趋势最为明显，当土壤水吸力达到1 500 kPa时，微塑料粒径为950 μm的T9处理的含水率减小幅度最大，是未加入微塑料的T0处理的49.71％；微塑料丰度及粒径的增大会提高土壤大孔隙比例，降低土壤中小孔隙比例；适用性评价结果表明，在大粒径微塑料赋存情况下土壤残余含水量（θr）和形状参数（n）随着微塑料丰度的增加而增大，饱和含水率（θs）和进气值倒数（ɑ）随着微塑料丰度的增加而减小。研究发现，随着微塑料丰度及粒径的增大，土壤的持水能力下降，土壤大孔隙比例增加，小孔隙比例减小；van Genuchten模型比Brooks-Corey模型更适合模拟微塑料赋存下的土壤水分特征曲线，大粒径的微塑料丰度增加可能更容易影响土壤孔隙结构的变化。 |
| 英文摘要: |
| To explore the effects of microplastics with different abundances（0.5%, 1%, and 2% of soil dry weight）and particle sizes（150, 550 μm, and 950 μm）on the soil water characteristic curve, 10 different treatments（T0 to T9）were applied in this study. Soil moisture characteristic following the different treatments were measured using a pressure film meter, and the applicability of the van Genuchten（VG） model, Brooks–Corey（BC）model, and other common soil moisture characteristic curve models were evaluated by RETC software combined with the simulated values of each curve. The results showed that the soil moisture content decreased more with increasing soil water suction when the microplastic abundance was 1.0% and 2.0% than with treatment with a microplastic abundance of 0.5%. When the microplastic abundance was 2.0%, the soil moisture content of the three groups with increasing grain sizes from 150 μm to 950 μm showed the most obviously decreasing trend. When the soil water suction value reached 1 500 kPa, the soil moisture content of T9 with a grain size of 950 μm showed the greatest decrease at 49.71% that of T0 without microplastics. The increase in microplastic abundance and particle size increased the proportion of soil macropores and decreased the proportion of soil micropores. The soil residual water content（θr）and shape parameter （n）increased with the increasing microplastic abundance, whereas the saturated water content（θs）and inverse of air intake value （ɑ）decreased with the increasing microplastic abundance. With increases in the microplastic abundance and particle size, the water holding capacity of the soil decreased, proportion of large pores increased, and proportion of small pores decreased. The VG model is more suitable than the BC model for simulating the soil moisture characteristic curve of microplastics, and an increased abundance of microplastics with large particle size may easily affect changes in the soil pore structure. |
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