Concentration‐ and Size‐Dependent Influences of Microplastics on Soil Hydraulic Properties and Water Flow

European Journal of Soil Science, Journal Year: 2025, Volume and Issue: 76(1)

Published: Jan. 1, 2025

ABSTRACT Extensive usage of agricultural plastic film correspondingly leads to excessive residues microplastics (MPs). MP accumulation alters soil hydraulic properties and water flow. However, little is known about the combined effects concentration particle size on hydrological properties, a numerical approach for modelling infiltrated flow has not been well developed. Hence, we determined affected by established model suitable MP‐contaminated soils. Quantitative findings indicated that saturated conductivity soil–MP mixture was 10.8%–50.0% smaller than pure soil, which decreased increased with increase in size, respectively. The always had significant influences conductivity; contrast, generated under condition small size. Besides, higher or MPs led weaker water‐holding capacity, residual content 0.6% – 41.5% 0.2% 11.6%, Furthermore, presence inhibited infiltration, wetting front migration rate cumulative infiltration 7.1% 29.4% 4.7% 21.7%, respectively, Correlation analysis negatively correlated saturated/residual moisture, infiltration; addition, conductivity, compared (15.63%), (46.28%) played major role response movement changes external environment. A two‐dimensional proposed considering Richards equation parameters mixture, based finite element theory further employed validated through comparing experimental observations simulations, high accuracy simulating process MP‐contained Our elucidate influence confirm potential using simulations predict

Language: Английский

Soil water, salt, and microplastics interact during migration: Performance and mechanism

Geoderma, Journal Year: 2025, Volume and Issue: 455, P. 117229 - 117229

Published: Feb. 24, 2025

Language: Английский

Insights into simultaneous changes of water evaporation and desiccation crack formation for microplastics-contained saline soils

Geoderma, Journal Year: 2024, Volume and Issue: 448, P. 116977 - 116977

Published: July 27, 2024

Increasing soil salinization and microplastics (MPs) pollution of farmland have become global agricultural issues that to be faced, destabilizing plant-soil systems bringing threats ecosystems. Few studies focused on the effects MPs saline water evaporation desiccation crack formation, underlying influencing mechanisms salts in soils. A mechanism test was conducted explore concentrations (0.5 %, 1 3 w/w) simultaneous changes cracking patterns soils with different salinities (0, 0.1 0.3 0.5 w/w). Quantitative findings showed (1) significantly reduced saturated conductivity by 14.9–46.8 % 4.6–54.5 non-saline lightly soil, respectively, which a decreasing trend increasing concentration; besides, also conductivity, but inhibition weakened salinity. (2) The total porosity 2.2–7.9 1.8–6.6 soils, exhibited slight concentration. (3) 0.4–6.1 0.9–6.5 respectively. As concentration increased, decreased, firstly decreased then increased. After evaporation, both salt inhibited cracking. Correlations indicated presence their interactions explained more than half variability characteristics parameters. Mechanism exploration suggested affect process behavior changing pore size distribution, damaging structure, repellency particles; inhibit surface through osmotic suction, blocking macropores, promoting inter-microaggregate cementation. Our provide evidences for influences physical properties, development, deserving attentions regulations developments soil-crop facing plastic pollution.

Language: Английский