IWA Publishing

Experimental soil samples were collected from a common farmland in Huangcun Town, Daxing District, Beijing, China. Soil type was fluvo-aquic, which is the representative soil type in Beijing. Soil samples were backfilled with homogeneous soil and layered soils. The physical properties of soil in the 0–300 cm layer are listed in Table 1.

Table 1

Physical properties of soil used in this study

				Saturated water content		Particle fraction (%)
Soil	Depth (cm)	Bulk density (g cm⁻³)	Field capacity (cm³ cm⁻³)	(cm³ cm⁻³)	Soil texture	Sand	Silt	Clay
Layered	0–100	1.48	0.24	0.50	Silt sandy-loam	61.53	37.47	1.00
	100–210	1.63	0.27	0.44	Loam	64.50	23.50	12.00
	210–300	1.55	0.25	0.45	Loam	69.00	19.70	11.30
Homogeneous	0–300	1.55	0.26	0.45	Silt sandy-loam	58.90	40.71	0.39

				Saturated water content		Particle fraction (%)
Soil	Depth (cm)	Bulk density (g cm⁻³)	Field capacity (cm³ cm⁻³)	(cm³ cm⁻³)	Soil texture	Sand	Silt	Clay
Layered	0–100	1.48	0.24	0.50	Silt sandy-loam	61.53	37.47	1.00
	100–210	1.63	0.27	0.44	Loam	64.50	23.50	12.00
	210–300	1.55	0.25	0.45	Loam	69.00	19.70	11.30
Homogeneous	0–300	1.55	0.26	0.45	Silt sandy-loam	58.90	40.71	0.39

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