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Table 1 Descriptive statistics of tree and stand data sets used in the analysis for fitting and validation

From: Stem taper function for sweet chestnut (Castanea sativa Mill.) coppice stands in northwest Spain

 

Fitting

Validation

n

Mean

Min

Max

Std. dev.

n

Mean

Min

Max

Std. dev.

Individual tree

Nº logs

3,188

16.30

6

25

3.89

719

11.83

3

20

4.07

D

3,188

25.69

10.20

44.50

7.94

719

19.65

6.90

49.15

8.12

H

3,188

19.26

9.54

31.02

3.37

719

16.68

8.35

26.08

3.84

n tree_a

3,188

1.87

1

8

1.39

719

2.43

1

7

1.33

h stump

3,188

0.12

0

0.60

0.10

719

0.14

0.020

0.68

0.14

V

3,188

0.35

0.011

1.85

0.30

719

0.19

0.020

1.01

0.19

Stand

n ree_b

63

2.19

1

26

2.25

30

2.73

1

24

2.42

N

63

1,692.52

410.26

4,753.42

942.07

30

2,025.51

222.82

8,244.23

1,762.97

G

63

40.01

16.33

65.33

11.30

30

10.29

3.41

35.40

6.79

H m

63

16.93

10.63

24.16

3.09

30

–

–

–

–

H 0

63

19.91

12.15

28.17

3.09

30

16.52

10.75

23.37

3.27

  1. D diameter at breast height (cm), H height (m), n tree_a number of stems from the stool where the sampled tree was cut, h stump stump height (m), V total over bark stem volume (m3), n tree_b number of stems in the stool, N number of stems per hectare (stems ha−1), G basal area (m2 ha−1), H m mean height (m), H 0 average height of the 100 thickest trees per hectare (m)
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Annals of Forest Science

ISSN: 1297-966X