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The distribution of microplastics in soil aggregate fractions in southwestern China
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Researchers investigated microplastic distribution across different soil types in agricultural and forested areas near a lake in southwestern China and found plastic particles in every sample, with concentrations as high as 42,960 particles per kilogram. Approximately 95% of the particles fell within the microplastic size range, and fibers were the dominant form, likely originating from textiles and agricultural materials. The study demonstrates that microplastic contamination in soils is extensive and varies with land use practices.
Plastic particle accumulation in arable soils is a growing contaminant of concern with unknown consequences for soil productivity and quality. This study aimed to investigate abundance and distribution of plastic particles among soil aggregate fractions in four cropped areas and an established riparian forest buffer zone at Dian Lake, southwestern China. Plastic particles (10-0.05 mm) from fifty soil samples were extracted and then sorted by size, counted, and categorized. Plastic particles were found in all soil samples. The concentration of plastic particles ranges from 7100 to 42,960 particles kg (mean 18,760 particles kg). 95% of the sampled plastic particles are in the microplastic size (1-0.05 mm) range. The predominant form is plastic fibers, making up on average 92% of each sample followed by fragments and films that contributed with to 8%. Results of this study also show that 72% of plastic particles are associated with soil aggregates, and 28% of plastic particles are dispersed. The abundance of aggregate-associated plastic fibers is significantly greater in the micro-aggregate than that in the macro-aggregate, whereas the less concentrations of plastic films and fragments are found in the micro-aggregate. Compared to the adjacent vegetable soil, the less concentration of plastic particles in the buffer soil implicates that application of soil amendments and irrigation with wastewater must be controlled to reduce accumulation of microplastics in agricultural soils. While the implications of microplastic on ecological and human health are poorly understood, the staggering number of microplastic in agricultural soils should be continually concerned in the future.
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Researchers surveyed microplastic contamination in soils across different land use types in Guizhou Province, southwest China. The study found that soil properties and land use patterns significantly influence microplastic abundance and distribution, with agricultural and urban soils generally showing higher contamination levels than less intensively managed areas.
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Researchers conducted a nationwide survey of microplastics in Chinese agricultural soils, collecting 477 samples from 109 cities across 31 regions, and identified spatial distribution patterns and key factors influencing farmland microplastic contamination.
Distinct microplastic distributions in soils of different land-use types: A case study of Chinese farmlands
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Microplastic distribution across six types of farmland land use was surveyed from soils in five Chinese provinces to determine how agricultural practices shape soil microplastic contamination. The study found that microplastic abundance varied significantly by land-use type, with plastic mulch film use and irrigation practices as key contributing factors.
Microplastics abundance associated with farmland use types and the impact on soil microbial communities: A case study in Southern China
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Researchers surveyed microplastic contamination across orchard, paddy field, and vegetable field soils in Southern China and analyzed how it affected soil microbial communities. They found microplastic levels ranging widely across sites, with very small particles under 30 micrometers being most common, and identified 32 different polymer types. The study shows that farmland use type and agricultural practices like plastic mulching significantly influence both the amount and type of microplastic contamination in soils.
The occurrence and distributions characteristics of microplastics in soils of different land use patterns in Karst Plateau, Southwest China
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Researchers surveyed microplastic contamination across five different land use types in a karst mountainous region of southwest China. The study found that all soil types were polluted with microplastics, with garden land showing the highest average abundance at 4,200 particles per kilogram, and that land use patterns and crop types influenced the characteristics and concentrations of microplastic contamination.
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