| 引用本文: | 王志超,张博文,李 哲,等.聚丙烯微塑料对滴灌条件下盐渍土水盐分布的影响[J].灌溉排水学报,2023,42(7):68-74. |
| WANG Zhichao,ZHANG Bowen,LI Zhe,et al.聚丙烯微塑料对滴灌条件下盐渍土水盐分布的影响[J].灌溉排水学报,2023,42(7):68-74. |
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| 摘要: |
| 【目的】探究微塑料对滴灌条件下不同盐分盐渍土水盐分布的影响。【方法】采用长方体（长×宽×高为30 cm×30 cm×40 cm）土槽以马氏瓶作为稳压滴灌水源，采用转子流量计设置流量为0.36 L/h进行室内土槽入渗模拟的方法，阐明了2%丰度聚丙烯（Polypropylene, PP）微塑料对不同含盐量盐渍土（0.5%、4%、7%）水平及垂直方向水分入渗后土壤水分、盐分运移及pH值的影响。【结果】入渗后土壤含水率与初始含盐量正相关，含盐量为7.0%的盐渍土处理较4.0%和0.5%的盐渍土处理平均含水率分别增加9.4%和11.2%（P<0.05）；在含盐量为0.5%、4.0%和7.0%条件下，赋存PP微塑料处理较未赋存微塑料处理在垂直距入渗点源16.6 cm位置含水率分别增加7.8%、9.4%和6.2%（P<0.05），在水平距点源12 cm位置含水率分别增加7.9%、7.7%和6.2%（P<0.05）且含水率与距点源距离负相关；在3种含盐量条件下赋存PP微塑料的处理较未赋存PP微塑料的处理盐分分别增加188.2%、326.9%和163.2%（P<0.05）；赋存PP微塑料的试验组在相同含盐量条件下，其在垂直、水平方向相同距离的pH值均呈现出大于未赋存PP微塑料的试验组的趋势。【结论】赋存PP微塑料后，土壤含水率、含盐量及pH值均大于未赋存PP微塑料的试验组。 |
| 关键词: 盐渍土；微塑料；盐分；含水率；pH |
| DOI：10.13522/j.cnki.ggps.2022637 |
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| Effect of Polypropylene Microplastics on Water and Salt Movement and in Saline Soils |
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WANG Zhichao，ZHANG Bowen，LI Zhe，CHENG Guangyuan，LI Wenlu，LI Weiping
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1. Department of Energy and Environment, Inner Mongolia University of Science and Technology, Baotou 014010, China;
2. Autonomous Region Level Ecological Protection and Comprehensive Utilization Cooperative
Innovation Center for the Inner Mongolia Section of the Yellow River Basin, Baotou 014010, China;
3. Water Conservancy Development Center of Inner Mongolia Ancient Autonomous Region, Hohhot 010020, China
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| Abstract: |
| 【Objective】Polypropylene microplastics are fragments of polypropylene. They exist in soil and have potential impact on soil environment. This paper investigates their influence on water flow and salt redistribution in soil under drip irrigation.【Method】The experiment was conducted in cuboid tanks packed by saline soil. Steady water infiltration into the soil was maintained by a Martensian flask; the infiltration rate was controlled at 0.36 L/h by a rotameter. The content of polypropylene microplastics in the soil was 2%, and the salt content was 0.5%, 4% or 7%. 【Result】Soil water content and initial soil salt content were positively correlated. The average water content in the soil with initial salt content of 7.0% was 9.4% and 11.2% higher than that in soils with initial salt contents of 4.0% and 0.5%, respectively (P<0.05). Compared with soil without polypropylene microparticles, the presence of polypropylene microparticles increased soil water content at the depth of 16.6 cm beneath the infiltration point on the soil surface by 6.2%~9.4%, and soil water content at the location 12 cm away horizontally from the infiltration point by 6.2%~7.9% (P<0.05), with the increase depending on initial salt content. Compared to control without polypropylene microplastics, existence of polypropylene microplastics also increased soluble salt 163.2% to 326.9% (P<0.05), with the increase depending on initial salt content, in addition to the increased soil pH.【Conclusion】Polypropylene microplastics increased soil moisture content, salt content and soil pH. These findings demonstrated the impact of polypropylene microplastics on soil properties and the importance of considering them in soil and water management. |
| Key words: saline soil; microplastic; salt; the moisture content; pH |
