| Cite this article: | 王志超,李嘉辰,张博文,等.基于CT扫描的微塑料对砂壤土孔隙结构的影响研究[J].灌溉排水学报,0,():-. |
| Wang Zhichao,Li Jiachen,Zhang Bowen,et al.基于CT扫描的微塑料对砂壤土孔隙结构的影响研究[J].灌溉排水学报,0,():-. |
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| Effect of microplastics on the pore structure of sandy loam soil based on CT scanning |
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Wang Zhichao, Li Jiachen, Zhang Bowen, Jing Shuangyi, Li Weiping
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Inner Mongolia University of Science and Technology
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| Abstract: |
| 【Background】Microplastics, an emerging pollutant, has become an important environmental issue of general concern worldwide. Microplastic pollution as a "source" of microplastics in the water environment and a "sink" for terrestrial microplastics is also receiving increasing attention from scholars, especially the research on soil microplastic pollution is imminent in recent years. 【Objective】To investigate the effect of microplastics on the pore structure of sandy loam soils, to provide scientific basis for the prevention and control of new soil contaminants microplastics, and to provide reference and guidance for soil structure and soil quality assessment by CT scanning.【Methods】The visualization of soil pore structure and the determination of pore characteristics parameters were carried out in CK (blank group without microplastics) and M (experimental group with 2% polypropylene microplastics) treatments using indoor soil column simulation and computed tomography.【Result】Polypropylene microplastics significantly affected the pore structure of sandy loam soils. The visualization of the three-dimensional pore structure revealed that the soil pores in the CK treatment were more uniformly distributed, with significant sinking and longitudinal continuity, while the soil pores in the M treatment were highly fragmented and less connected; and the soil porosity was 4.98% in the CK treatment and only 3.79% in the M treatment. The number of soil pores and pore volume distribution changed with soil depth under the conditions of polypropylene microplastic fugacity. In the depth range of 0-4 cm, the total number of soil pores was CK > M. The total number of soil pores in the M treatment was 73.02% lower than that in the CK treatment, and the difference in the number of pores between them gradually increased with the increase of soil depth; the average volume of soil pores was CK (1709 mm3) > M (1235 mm3), and compared with the CK treatment, the large volume of the M treatment compared with the CK treatment, the large volume of soil pore volume in the M treatment had different degrees of reduction. Polypropylene microplastics influenced the pore morphological characteristics of sandy loam soils. With the increase of soil depth, the pore rounding rate of CK treatment tended to be stable and the pores were closer to round; however, the average equivalent diameter of pores showed that M > CK, and the average equivalent diameter of M treatment all showed a gradually increasing trend with the increase of soil depth. 【Conclusion】The deposition of polypropylene microplastics affected the pore structure and reduced the soil porosity of sandy loam soils, and also had an effect on the number and morphological characteristics of soil pores. |
| Key words: computed tomography technique; microplastics; soil pore structure; three-dimensional visualization |
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