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Table 1 Effect of tree species, canopy cover, soil depth, and their interactions on seedling density and species diversity, with statistical results of GLM (F, P, R 2adjusted values)

From: Tree species determine soil seed bank composition and its similarity with understory vegetation in a semi-arid African savanna

  Means ± 95% C.I.
Seed density (n/m2) Species richness (n/m2) Shannon Wiener species diversity (H’)
Acacia robusta
 Inside canopy
 0–5 cm 31.5 ± 5.30 12.5 ± 0.90 1.89 ± 0.10
 5–10 cm 12.27 ± 2.3 7.5 ± 1.50 1.49 ± 0.20
 Outside canopy
 0–5 cm 8.84 ± 2.20 12.5 ± 0.9 1.64 ± 0.14
 5–10 cm 12.39 ± 2.90 5.75 ± 1.3 1.29 ± 0.16
Balanites aegyptiaca
 Inside canopy
 0–5 cm 9.63 ± 1.80 13.0 ± 2.04 1.87 ± 0.16
 5–10 cm 17.82 ± 4.12 5.5 ± 1.04 1.26 ± 0.10
 Outside canopy
 0–5 cm 24.60 ± 4.31 12.0 ± 1.41 1.91 ± 0.10
 5–10 cm 12.63 ± 3.14 6.0 ± 1.10 1.19 ± 0.10
Ziziphus spina-Christi
 Inside canopy
 0–5 cm 18.48 ± 4.23 16.0 ± 1.50 2.17 ± 0.18
 5–10 cm 8.34 ± 1.40 15.3 ± 0.80 1.77 ± 0.08
 Outside canopy
 0–5 cm 6.75 ± 1.30 9.0 ± 0.91 1.69 ± 0.20
 5–10 cm 7.03 ± 1.40 7.3 ± 0.48 1.53 ± 0.17
 Tree species (TS)
F (df = 2, 36) 3.920 5.820 3.430
P 0.021 0.007 0.043
 Canopy cover (CC)
F (df = 1, 36) 4.070 16.510 6.320
P 0.044 0.001 0.017
 Soil depth (SD)
F (df = 1, 36) 5.270 38.240 15.130
P 0.022 <0.001 0.001
 TS × CC
F (df = 2, 36) 4.670 10.750 1.580
P 0.010 0.001 0.221
 TS × SD
F (df = 2, 36) 0.600 7.630 8.470
P 0.549 0.002 0.001
 CC × SD
F (df = 1, 36) 1.040 0.420 1.740
P 0.308 0.521 0.196
 TS × CC × SD
F (df = 2, 36) 8.280 0.750 1.330
P 0.003 0.478 0.280
 Adjusted R 2 0.650 0.730 0.570