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Microplastics trapped in soil aggregates of different land-use types: A case study of Loess Plateau terraces, China

Environmental Pollution 2022 58 citations ? Citation count from OpenAlex, updated daily. May differ slightly from the publisher's own count. Score: 45 ? 0–100 AI score estimating relevance to the microplastics field. Papers below 30 are filtered from public browse.

Haixin Zhang, Haohao Li, Haixin Zhang, Haixin Zhang, Haixin Zhang, Haixin Zhang, Haixin Zhang, Yimei Huang, Yimei Huang, Yimei Huang, Yimei Huang, Zhao Jun-feng, Haohao Li, Haohao Li Haohao Li Yimei Huang, Yimei Huang, Yimei Huang, Zhao Jun-feng, Haohao Li, Shaoshan An, Haixin Zhang, Qian Huang, Shaoshan An, Shaoshan An, Shaoshan An, Shaoshan An, Shaoshan An, Haohao Li Yimei Huang, Yimei Huang, Haohao Li Haohao Li, Zhao Jun-feng, Zhao Jun-feng, Shaoshan An, Shaoshan An, Li Xiao, Haohao Li Qian Huang, Haohao Li, Qian Huang, Shaoshan An, Shaoshan An, Shaoshan An, Shaoshan An, Yimei Huang, Shaoshan An, Shaoshan An, Haohao Li

Summary

Researchers measured microplastic abundance in soil aggregates from four land-use types on China's Loess Plateau, finding MPs trapped in aggregates across all land uses with farmland soils having the highest concentrations. Woodland soils had the lowest MP content and the most stable aggregate structure, suggesting land use substantially controls both MP accumulation and aggregate integrity.

Land-use types may affect soil aggregates' stability and organic carbon (OC) distribution characteristics, but little is known about the effects on the distribution characteristics of microplastics (MPs) in the aggregates. Hence, the MPs abundance of soil aggregates and analyzed aggregates' stability, composition, and OC content from two soil layers of four land-use types in Gansu Province were investigated in this study. The total MPs abundances in woodland, farmland (wheat, maize, and potato), orchard, and intercropping (potato + apple orchard) of top and deep soils were 1383.3 and 1477.9, 1324.6 and 931.1, 1757.1 and 1930.9, 2127.2 and 1998.0, 1335.9 and 886.7, and 1777.5 and 1683.3 items kg, respectively. The largest MPs abundance was detected in the >5 mm fractions of topsoil in potato (3077.3 items kg), followed by maize (3044.7 items kg) and intercropping (2718.4 items kg). In the topsoil, the total MPs abundance increased significantly with decreasing aggregate stability, and also was positively correlated with bulk density, microbial biomass, and total nitrogen contents of bulk soil. Summarizing, the abundance distribution of MPs correlates with the soil aggregate characteristics of the different land-use types.

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