Journal of Ecology 2002, 90 (3), 480-494. DOI: 10.1046/j.0022-0477.2002.00683.x

Rooting depths, lateral root spreads and below-ground/above-ground allometries of plants in water-limited ecosystems

Supplementary material to Schenk, H.J. & Jackson R.B. (2002) Rooting depths, lateral root spreads and below-ground/above-ground allometries of plants in water-limited ecosystems. J. Ecol. 2002; 90(3), 480–494.

Appendix 1

List of references containing the root data used in this study.

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Appendix 2

Table A1  Summary table of absolute root dimensions for plant growth forms. Arithmetic means, medians, geometric means and skewness for maximum rooting depths (Di), lateral root spreads (Li), and Li/Di ratios for seven plant growth forms. All geometric means marked by different letters were significantly different at p < 0.001, except for rooting depths in shrub vs. trees and lateral root spreads/rooting depths for perennial grasses vs. semi-shrubs (both at P < 0.01).

 nArithmetic
mean
Median95% CI for
median
Geometric
mean
95% CI for
geometric mean
Geometric
skewness ± SE
Rooting depths (m)
Trees765.783.002.20–4.503.27 a2.54 – 4.084.05 ± 0.28
Shrubs1562.922.152.00–2.792.14 b1.87–2.423.21 ± 0.19
Semi-shrubs3051.671.301.20–1.471.27 c1.16–1.385.82 ± 0.14
Perenn. grasses2711.271.071.00–1.201.04 d0.96–1.121.94 ± 0.15
Perenn. forbs3301.461.221.09–1.391.05 d0.95–1.151.43 ± 0.13
Annuals1230.620.370.26–0.550.38 e0.32–0.461.75 ± 0.22
Succulents430.390.250.18–0.300.28 e0.21–0.351.44 ± 0.36
Lateral root spreads (m)
Trees4011.537.675.00–10.757.67 a5.11 – 9.881.77 ± 0.38
Shrubs1194.002.101.73–2.682.20 b1.79–2.654.61 ± 0.22
Semi-shrubs2271.040.620.53–0.750.64 c0.56–0.723.60 ± 0.16
Perenn. grasses1680.550.300.26–0.380.34 d0.30–0.385.76 ± 0.19
Perenn. forbs2700.460.300.25–0.350.30 d0.27–0.347.03 ± 0.15
Annuals1090.220.120.08–0.150.12 e0.09–0.142.53 ± 0.23
Succulents322.141.510.98–2.801.37 b0.84 – 2.021.50 ± 0.41
Lateral / depth ratio
Trees377.003.331.82–5.382.89 a1.63 – 4.502.46 ± 0.39
Shrubs1132.600.910.68–1.171.02 b0.80–1.277.01 ± 0.23
Semi-shrubs2271.280.500.21–1.000.50 c0.44–0.5714.38 ± 0.16
Perenn. grasses1680.550.340.30–0.390.35 d0.31–0.403.14 ± 0.19
Perenn. forbs2700.520.280.26–0.310.30 d0.27–0.344.06 ± 0.15
Annuals1090.470.300.25–0.380.31 d0.26–0.373.15 ± 0.23
Succulents326.405.632.94–8.134.50 a3.06 – 6.210.81 ± 0.41

Appendix 3

References to Table 4.

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