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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 contentParticle fraction (%)
SoilDepth (cm)Bulk density (g cm−3)Field capacity (cm3 cm−3)(cm3 cm−3)Soil textureSandSiltClay
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 contentParticle fraction (%)
SoilDepth (cm)Bulk density (g cm−3)Field capacity (cm3 cm−3)(cm3 cm−3)Soil textureSandSiltClay
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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