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Table 1 Fine root biomass, productivity (Mean ± 1 S.E. with range in parentheses), and number of samples (n) for plant groups by ecosystem types, life forms, leaf phenology, and phylogeny. Differences between ecosystem types are tested using a one-way ANOVA with a Tukey’s post hoc test for significance. Significant differences (α = 0.05) are indicated by different letters

From: Testing allometric scaling relationships in plant roots

Plant groups Biomass (Mg·ha− 1) Productivity (Mg·ha− 1·yr− 1) n
Ecosystem types
 Boreal forests 2.23B ± 0.14 (0.04–10.70) 2.72C ± 0.17 (0.12–14.19) 184
 Temperate forests 3.19B ± 0.21 (0.02–30.00) 2.81C ± 0.22 (0.07–35.09) 254
 Subtropical forests 2.84B ± 0.27 (0.08–14.48) 2.61C ± 0.24 (0.05–10.40) 101
 Tropical forests 3.54B ± 0.29 (0.19–20.58) 2.98C ± 0.27 (0.06–20.84) 118
 Temperate grasslands 10.10A ± 1.64 (0.32–65.70) 4.87BC ± 0.83 (0.21–29.31) 50
 Tropical grasslands 8.71A ± 1.83 (1.22–24.00) 6.97AB ± 1.33 (3.06–15.92) 12
 Tundra 9.75A ± 2.85 (0.23–28.25) 6.66AB ± 1.77 (0.36–19.70) 16
 Wetlands 8.97A ± 1.19 (0.04–49.01) 8.03A ± 1.24 (0.10–54.45) 91
Life forms
 Forbs 14.35A ± 8.31 (0.70–40.60) 10.55A ± 5.58 (1.00–29.17) 5
 Graminoids 11.62A ± 1.17 (0.04–65.70) 8.76A ± 1.09 (0.10–54.45) 103
 Shrubs 10.61A ± 2.52 (0.36–28.25) 7.58A ± 1.67 (1.02–19.70) 16
 Trees 2.95B ± 0.11 (0.02–30.00) 2.74B ± 0.11 (0.05–35.09) 702
Leaf phenology
 Deciduous 6.35A ± 0.48 (0.04–65.71) 4.81A ± 0.41 (0.05–54.45) 333
 Evergreen 3.85B ± 0.25 (0.02–54.92) 2.84B ± 0.14 (0.04–35.09) 493
Phylogeny
 Angiosperm 5.34A ± 0.34 (0.04–65.71) 4.18A ± 0.27 (0.05–54.45) 497
 Gymnosperm 2.59B ± 0.14 (0.02–15.00) 2.79B ± 0.16 (0.11–35.09) 329
 All 4.24 ± 0.22 (0.02–65.71) 3.63 ± 0.19 (0.04–54.45) 826