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Table 1 The r2 of each climate, biotic factors and phylogeny in explaining the scaling exponent for allometric relationships of leaf, stem and root biomass with diameter at breast height (L-D, S-D, and R-D, respectively). Negative r2 represents negative correlation while others represent positive correlation. Significant relationships (p < 0.05) were boldfaced. Abbreviations: PET annual potential evapotranspiration, MTCM mean temperature for the coldest month, MI moisture index

From: Effects of climate, biotic factors, and phylogeny on allometric relationships: testing the metabolic scaling theory in plantations and natural forests across China

  Overall Plantation Natural forest
r2 p r2 p r2 p
L-D scaling exponent
 Climate
  PET −0.02 0.043 0.00 0.823 −0.09 0.005
  MTCM −0.03 0.008 0.00 0.356 −0.10 0.003
  MI −0.01 0.250 −0.01 0.232 0.00 0.717
 Biotic factors
  Biome 0.02 0.136 0.00 0.917 0.09 0.060
  Forest type 0.01 0.425 0.01 0.291
  Leaf form 0.00 0.393 0.00 0.422 0.01 0.394
  Leaf phenology 0.01 0.106 0.00 0.826 0.07 0.014
  Stem density 0.05 0.010 0.05 0.024 0.05 0.188
  Forest age 0.01 0.232 0.02 0.137 −0.02 0.409
 Phylogeny
  Family 0.14 0.347 0.16 0.153 0.17 0.787
  Genus 0.26 0.166 0.22 0.257 0.40 0.467
  Species 0.43 0.102 0.40 0.120 0.58 0.381
S-D scaling exponent
 Climate
  PET 0.00 0.243 0.01 0.260 0.00 0.664
  MTCM 0.00 0.990 0.00 0.983 0.00 0.899
  MI −0.02 0.030 0.00 0.457 −0.06 0.012
 Biotic factors
  Biome 0.01 0.297 0.01 0.551 0.03 0.410
  Forest type 0.03 0.011 0.07 0.004
  Leaf form 0.00 0.307 0.00 0.450 0.08 0.003
  Leaf phenology 0.00 0.664 0.00 0.352 0.00 0.748
  Stem density 0.00 0.493 −0.01 0.328 0.00 0.622
  Forest age 0.00 0.511 0.00 0.707 0.00 0.982
 Phylogeny
  Family 0.25 0.000 0.17 0.106 0.45 0.000
  Genus 0.39 0.000 0.28 0.030 0.70 0.000
  Species 0.53 0.000 0.42 0.074 0.77 0.000
R-D scaling exponent
 Climate
  PET 0.00 0.782 −0.02 0.084 0.02 0.223
  MTCM −0.01 0.336 −0.05 0.015 0.01 0.387
  MI −0.00 0.846 0.00 0.801 0.00 0.937
 Biotic factors
  Biome 0.01 0.428 0.06 0.051 0.05 0.332
  Forest type 0.01 0.433 0.02 0.306
  Leaf form 0.02 0.037 0.02 0.139 0.06 0.044
  Leaf phenology 0.00 0.704 0.00 0.621 0.02 0.262
  Stem density −0.02 0.222 0.00 0.770 −0.10 0.128
  Forest age 0.00 0.816 0.01 0.270 −0.02 0.494
 Phylogeny
  Family 0.26 0.013 0.17 0.394 0.41 0.054
  Genus 0.41 0.004 0.24 0.447 0.76 0.000
  Species 0.58 0.003 0.47 0.161 0.82 0.005