Effects of Long-term Application of Organic Fertilizer on the Occurrence and Migration Characteristics of Soil Microplastics

被引：0
|
作者：
Wang C.-Y. [1 ,2 ,3 ]
Ma X.-C. [1 ,2 ]
Guo D.-J. [1 ,2 ]
Liu X.-H. [1 ,2 ]
Ma Y. [1 ,2 ,3 ]
Luo J. [1 ,2 ,3 ]
机构：
[1] Institute of Agricultural Resource and Environmental Sciences, Jiangsu Academy of Agricultural Sciences, Nanjing
[2] National Agricultural Experiment Station for Agricultural Environment, Luhe, Nanjing
[3] School of the Environment and Safety Engineering, Jiangsu University, Zhenjiang
来源：
Huanjing Kexue/Environmental Science | 2024年 / 45卷 / 04期
关键词：
facility farmlands; microplastics; migrate; organic fertilizer; soil depth;
D O I：
10.13227/j.hjkx.202304174
中图分类号：
学科分类号：
摘要：
To explore the response relationship between the occurrence characteristics of microplastics in the facility soil (fertilization mode, planting years, and soil depth), the abundance, shape, particle size, color, type, and surface morphology characteristics of microplastics in the soil with long-term application of organic fertilizer, as well as the abundance, particle size, and type of microplastics in organic fertilizer, were analyzed through on-site sampling, microscopic observation, Fourier transform infrared spectroscopy (FTIR), and scanning electron microscopy (SEM). The results showed that the average abundance of microplastics in the surface soil under different planting years (2016-2021) increased with the increase in planting years, and the abundance of microplastics in the chemical fertilizer (CF), organic fertilizer (OF), and biochar organic fertilizer (BOF) treatments differed, among which the abundance of microplastics in the OF treatment was the highest per year, and the highest abundance of microplastics in the topsoil with long-term application of OF in 2021 was 543.33 n∙kg-1. The average annual growth rates of microplastics in the soil treated by the three fertilization treatments were 11.16%, 12.61%, and 9.17%, respectively. The abundance of microplastics decreased significantly with the increase in soil depth in different soil layers, and the migration efficiency of microplastics to deep soils was the highest in the BOF treatment. The shapes of the microplastics were mainly fibrous, fragmentary, particle, and film, and in the soil at a depth of 0-40 cm, fibrous microplastics were dominant in the soil of all three fertilization types. In 40-60 cm soil, CF-treated fibrous and thin-film microplastics were not detected, and particle microplastics accounted for the highest proportion (57.14%). The OF treatment did not have the presence of film microplastics, and particle microplastics and fibrous microplastics accounted for the highest proportion (36.00%). The highest proportion in the BOF treatment was particle microplastics (41.18%), and the lowest proportion was that of film microplastics (5. 88%). The proportion of small-size (<0.5 mm) microplastics in the three fertilization-treated soils was the highest, and PE was the main microplastic species in the three treated soils of CF, OF, and BOF;additionally, the characteristics of porous, torn, cracked, and worn on the surface of microplastics were all presented. The average abundance of microplastics in organic fertilizer was as high as 577.78 n∙kg-1. The abundance of microplastics in the soil of facilities for the long-term application of organic fertilizers was closely related to organic fertilizers, and the migration of microplastics was also closely related to the types of fertilizers applied. It is of great significance to clarify the distribution characteristics and migration of microplastics in facility soils under different long-term fertilization modes. © 2024 Science Press. All rights reserved.
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页码：2304 / 2312
页数：8
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