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Anthropogenic activities and hydrologic environment of Danjiangkou Reservoir regulate soil microplastics in the water level fluctuation zone
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Researchers conducted large-scale sampling in the water-level fluctuation zone of Danjiangkou Reservoir in China to understand microplastic distribution. They found that microplastic abundance ranged from 144 to 1050 particles per kilogram of soil, with human activities and land use being the primary factors determining contamination levels. The study shows that the reservoir's hydrological environment, including water level changes and flow patterns, plays a key role in redistributing microplastics.
Information about microplastics (MPs) in the water-level fluctuation zone (WLFZ), a transitional zone between aquatic and terrestrial ecosystems, remains relatively limited. To address this knowledge gap, this study selected the WLFZ (150-170 m) of Danjiangkou Reservoir and conducted large-scale sampling of soil and shoreline water samples before the rainy season. The aim was to investigate the distribution and characteristics of MPs in the WLFZ and to identify the key influencing factors. The results showed that the abundance of soil MPs in the WLFZ ranged from 144 to 1050 items/kg. The MPs abundance in the Dan Reservoir was higher than that in the Han Reservoir. Specifically, the mainstream exhibited higher MPs abundance than the tributaries in the Dan Reservoir, whereas the tributaries in the Han Reservoir were larger than the mainstream. The abundance of soil MPs in bare land and farmland was significantly higher than in grassland and woodland. The MPs are predominantly the size of 0.1-1 mm, the shape of fibers and pellets, the color of transparent and blue, and the polymer types are mainly polypropylene (PP) and polyethylene (PE). Among all influencing factors, human activities (distance from village and population density) and land use was identified as determinants of MPs abundance. The hydrological environment of the reservoir, including water level fluctuations, reservoir bays and banks, and mainstreams and tributaries, influenced the redistribution of MPs. This study systematically reveals the distribution of MPs pollution in the WLFZ and provides a key scientific basis for the prevention and control of MPs pollution.
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Effects of land use on soil microplastic distribution adjacent to Danjiangkou reservoir, China
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Researchers collected 120 soil samples around China's Danjiangkou Reservoir — a major drinking water source — and found microplastics at concentrations ranging from 645 to over 15,000 particles per kilogram. Subsoil layers (20–40 cm deep) contained more microplastics than surface layers, and the number of nearby villages was the strongest predictor of contamination. These findings are significant because reservoir-surrounding soils act as a reservoir for microplastics that can ultimately enter drinking water supplies.
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This study characterized microplastic occurrence in four types of agricultural soil in the Danjiangkou Reservoir area of China — a critical water source for the South-to-North Water Diversion Project. Orchard soils had higher microplastic concentrations than paddy or dryland soils, driven by plastic mulch use and irrigation. Microplastic contamination of this major water supply raises concerns about downstream drinking water quality for millions of people.
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Researchers surveyed microplastic contamination across five different land use types in a Chinese river watershed. They found that urban soils had the highest microplastic levels, followed by agricultural areas, with woodland having the lowest, and that population density strongly correlated with microplastic diversity. The study suggests that human activity intensity and plastic waste disposal are the main drivers of soil microplastic pollution at the watershed scale.
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A study across different land-use types in China's Pearl River Delta found that agricultural land had higher soil microplastic concentrations than urban or forested areas, with land-use history and plastic mulch film use as the dominant factors controlling MP distribution and polymer composition.
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Researchers measured microplastic levels across different land use types on China's Loess Plateau and found an average abundance of nearly 3,000 particles per kilogram of soil. Construction land and cultivated areas had the highest concentrations, while grassland and woodland had lower levels. The study demonstrates that human land use patterns directly influence how much microplastic accumulates in soil across this important agricultural region.
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