Effects of microplastic particles on soil bulk density.
(A) Visualization
of the impact of microplastics on bulk density over the range of treatment
concentrations. (B) Focusing on effects of microplastic concentration
irrespective of microplastic type. For A and B, data were represented
by mean and standard error (N = 5 per microplastic
treatments, 10 for controls). (C) Summary of effect range of microplastic
types for bulk density combining treatment concentration. Data distribution
was depicted by violin plots with median, interquartile range and
95% confidence interval overlaid. Dots represent outlying data. Microplastic
types are color-coded: controls (dark gray), polyacrylic (yellow),
polyamide (green), polyester (red) and polyethylene (blue) treatments
(i.e., linear microplastics are in warm colors- yellow and red, nonlinear
microplastics are in cold colors- blue and green).