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Soil samples were taken from the ground surface down to 160 cm depth in each community using a soil auger. Well construction revealed that soils deeper than 160 cm were silt and thus were treated as homogenous. Soil mechanical composition and bulk density were analyzed in the laboratory and are summarized in Table 1.

Table 1

Measured soil texture composition and bulk density data

CommunitySoil layerSoil depth (cm)Sand (%)Silt (%)Clay (%)Bulk density (g/cm3)Soil texture
A. capillaris community 0–20 92.8 6.2 1.0 1.33 Sand 
20–80 91.2 7.8 1.0 1.26 
80–120 84.2 9.6 6.2 1.35 
120–160 54.2 36.4 10.4 1.37 Sandy silt 
P. australis community 0–20 13.6 76.0 11.4 1.35 Silt 
20–80 23.1 64.3 12.5 1.24 
80–160 17.7 68.4 13.9 1.40 
CommunitySoil layerSoil depth (cm)Sand (%)Silt (%)Clay (%)Bulk density (g/cm3)Soil texture
A. capillaris community 0–20 92.8 6.2 1.0 1.33 Sand 
20–80 91.2 7.8 1.0 1.26 
80–120 84.2 9.6 6.2 1.35 
120–160 54.2 36.4 10.4 1.37 Sandy silt 
P. australis community 0–20 13.6 76.0 11.4 1.35 Silt 
20–80 23.1 64.3 12.5 1.24 
80–160 17.7 68.4 13.9 1.40 

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