Fig. 3: Effects of rainfall intensity and vegetation on the hydraulic property of the planting soil layer in green roofs.
From: Green roofs act as the first barrier to intercept microplastics from urban atmosphere
a Moisture content variation. b Infiltration time variation. c Schematic of the infiltration process affected by the proposed contributor. Specifically, the thick lines represent relatively larger preferential flow channels that exist under low soil moisture conditions, allowing for faster infiltration. In contrast, the thin lines correspond to finer channels formed due to soil swelling under higher moisture conditions, resulting in slower infiltration (BL: blank group, CK: control group, RR: R. rosea group, SL: S. lineare group). Error bars and shading represent the standard deviation of triplicate measurements.
