Table 1 Regression coefficients (± SE), BEF values (± SE) and the fit statistics for each tree component and for total biomass

 1

Taproot + stump

1.3122 (±36.69 %)^b

0.0045 (±4.44 %)^c

87.93

7.94

33.57

1.1612

 2

Lateral roots

– 1.0600 (±43.02 %)^a

0.0051 (±3.92 %)^c

91.09

8.05

33.47

1.7376

  3

Root system (1 + 2)

0.2522 (±251.15 %) ^ns

0.0097 (±2.06 %) ^c

95.00

9.59

20.10

– 0.0709

 4

Stem wood

0.6616 (±173.08 %)^ns

0.0251 (±1.59 %)^c

97.52

19.66

15.84

0.0871

 5

Stem bark

0.1895 (±186.28 %)^ns

0.0028 (±3.57 %)^c

84.41

4.97

34.97

0.2638

  6

Stem (4 + 5)

0.8511 (±147.84 %) ^ns

0.0279 (±1.79 %) ^c

97.58

21.89

15.83

0.1029

 7

Branches

– 0.4569 (±332.74 %)^ns

0.0114 (±5.26 %)^c

82.14

27.54

49.55

0.7460

 8

Foliage

0.7602 (±15.85 %)^c

0.0004 (±10.00 %)^c

49.41

1.86

66.21

1.5472

  9

Crown (7 + 8)

0.3033 (±515.66 %) ^ns

0.0118 (±5.08 %) ^c

82.36

25.11

43.01

– 0.3190

  10

Shoot system (6 + 9)

1.1544 (±149.39 %) ^ns

0.0398 (±1.51 %) ^c

97.75

31.07

15.80

– 0.0364

  11

Whole tree (3 + 10)

1.4066 (±156.29 %) ^ns

0.0494 (±1.62 %) ^c

97.64

34.92

14.29

– 0.0440

 1

Taproot + stump

0.0000

0.1407 (±3.53 %)^c

80.96

8.34

35.26

4.3080

 2

Lateral roots

0.0000

0.1162 (±4.43 %)^c

80.11

10.75

44.70

2.7686

  3

Root system (1 + 2)

0.0000

0.2569 (±2.66 %) ^c

92.36

11.49

24.08

3.6116

 4

Stem wood

0.0000

0.6569 (±1.04 %)^c

98.54

16.72

13.48

0.0755

 5

Stem bark

0.0000

0.0765 (±3.81 %)^c

77.52

5.10

35.92

5.5460

  6

Stem (4 + 5)

0.0000

0.7334 (±0.95 %) ^c

98.85

18.77

13.57

0.0600

 7

Branches

0.0000

0.2928 (±5.20 %)^c

74.54

29.10

52.35

2.7087

 8

Foliage

0.0000

0.0242 (±10.60 %)^c

36.17

2.93

104.21

2.7751

  9

Crown (7 + 8)

0.0000

0.3170 (±5.05 %) ^c

76.34

28.89

49.48

2.7138

  10

Shoot system (6 + 9)

0.0000

1.0504 (±1.65 %) ^c

95.05

36.61

18.61

4.6507

  11

Whole tree (3 + 10)

0.0000

1.3072 (±1.71 %) ^c

95.06

45.67

18.69

4.4466