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Table 4 Mean ± SD of diameter growth of unwounded, wounded and reduction of diameter growth (RDG) of beech trees 12 years after wound occurrence in related to wounds characteristics

From: Effect of logging wounds on diameter growth of beech (Fagus orientalis Lipsky) trees following selection cutting in Caspian forests of Iran

Wounds characteristic

n paired

Unwounded (mm.year−1)

Wounded (mm.year−1)

RDG (%)

t paired

P value

Wound position (m)

      

<0.3

31

6.63 ± 1.8

5.92 ± 1.8

10.7

1.48

0.148

0.3–1

15

6.66 ± 0.6

6.06 ± 1.4

9.9

1.64

0.124

>1

10

6.35 ± 2.2

6.45 ± 0.9

−1.6

0.18

0.862

Wound size (cm2)

      

<100

9

5.96 ± 1.1

5.93 ± 0.9

0.5

0.04

0.966

101–200

31

6.25 ± 1.2

6.20 ± 1.0

0.8

0.24

0.812

>201

16

7.36 ± 1.5

5.21 ± 2.1

29.3

2.92*

0.010

Wound severity

      

Bark

9

6.74 ± 0.9

6.72 ± 0.9

0.3

0.03

0.972

Phloem

14

6.50 ± 0.9

6.46 ± 1.1

0.6

0.07

0.871

Wood

33

6.60 ± 1.1

5.73 ± 1.4

13.2

4.22**

0.000

Wound condition

      

Healed

21

6.72 ± 0.8

6.60 ± 1.0

1.8

1.27

0.217

Still open

18

6.67 ± 1.0

5.88 ± 1.4

11.8

1.94

0.069

Decayed

17

6.54 ± 1.0

5.54 ± 1.5

15.3

5.48**

0.000

All trees

56

6.59 ± 1.65

6.05 ± 1.54

8.1

1.80

0.078

  1. *α = 0.05; **α = 0.01.