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Table 5 Pearson’s correlation coefficient test of significance, and distance covariance test of independence of biomass expansion factors (BEF) on diameter at breast height (DBH) in A. johnsonii

From: Tree component biomass expansion factors and root-to-shoot ratio of Lebombo ironwood: measurement uncertainty

BEF vs. DBH
   Pearson’s correlation test Distance covariance test of independence
# Tree component r Probability dcov dcor Probability
1 Taproot + stump – 0.4310 1.6E-05 0.1802 0.4668 0.0150
2 Lateral roots 0.3211 0.0017 0.1670 0.4377 0.0150
3 Root system (1 + 2) – 0.0714 0.4963 0.1154 0.2546 0.0700
4 Stem wood 0.0564 0.5911 0.0671 0.1430 0.7650
5 Stem bark – 0.0504 0.6314 0.0442 0.1468 0.5200
6 Stem (4 + 5) 0.0344 0.7435 0.0677 0.1428 0.7450
7 Branches 0.0323 0.7583 0.1567 0.2190 0.2950
8 Foliage – 0.5429 1.9E-08 0.1521 0.5874 0.0150
9 Crown (7 + 8) – 0.0575 0.5838 0.1684 0.2274 0.2450
10 Shoot system (6 + 9) – 0.0394 0.7080 0.1738 0.2260 0.3300
11 Total tree (3 + 10) – 0.0522 0.6192 0.2132 0.2432 0.2750
  1. The major components and their values are indicated in bold font. r, Perason’s correlation coefficient; dcov, distance covariance; dcor, distance correlation; probability refers to the significance of the test.
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