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Table 2 Summary of model II (reduced major axis) regressions of log10- fine-root productivity (y) and -biomass (x) by ecosystem types, life forms, leaf phenology, and phylogeny. n is the number of samplings

From: Testing allometric scaling relationships in plant roots

Biome Intercept 95% CI intercept Slope 95% CI slope r2 n
Ecosystem types
 Boreal forests 0.082 0.108 ~ 0.053 1.003 0.833 ~ 1.139 0.238 184
 Temperate forests −0.036 −0.057 ~ –0.015 0.930 0.853 ~ 1.015 0.511 254
 Subtropical forests −0.125 −0.177 ~ –0.080 1.112 0.958 ~ 1.292 0.433 101
 Tropical forests −0.131 −0.203 ~ – 0.068 1.078 0.923 ~ 1.258 0.286 118
 Temperate grasslands −0.279 −0.417 ~ –0.166 0.938 0.780 ~ 1.128 0.594 50
 Tropical grasslands 0.166 −0.287 ~  0.423 0.731 0.415 ~ 1.284 0.287 12
 Tundra −0.085 −0.212 ~  0.020 0.944 0.774 ~ 1.151 0.878 16
 Wetlands −0.149 −0.197 ~ –0.105 1.026 0.944 ~ 1.115 0.843 91
Life forms
 Forbs 0.238 −0.350 ~  0.496 0.738 0.323 ~ 1.685 0.747 5
 Graminoids −0.036 −0.140 ~  0.082 0.928 0.814 ~ 1.057 0.850 38
 Shrubs 0.043 −0.125 ~  0.176 0.828 0.655 ~ 1.047 0.829 16
 Trees −0.050 −0.068 ~ –0.035 1.026 0.969 ~ 1.087 0.400 702
Leaf phenology
 Deciduous −0.135 −0.165 ~ – 0.105 0.983 0.920 ~ 1.050 0.626 333
 Evergreen −0.011 −0.031 ~  0.008 1.010 0.942 ~ 1.082 0.387 493
Phylogeny
 Angiosperm −0.136 −0.162 ~ –0.111 1.016 0.959 ~ 1.077 0.564 497
 Gymnosperm 0.046 0.028 ~ 0.063 0.967 0.890 ~ 1.050 0.418 329
 All −0.080 −0.121 ~ –0.039 0.980 0.934 ~ 1.029 0.508 826