Table 2 Diameter increments (mm) measured with diameter tapes and dendrometer bands, and the differences and correlation coefficients between the two measurements for 5-year (2012–2016) and 10-year (2012–2021) measuring periods in Xitou, central Taiwan

Mean

Range

Mean

Range

Mean

Range

R

p-value

2012–2016 (5 years measuring period)

CP1

n = 28

8.5 ± 7.6^a

-1.6–23.9

8.7 ± 5.6

0–22.3

-0.2 ± 3.8

-9.7–5.3

0.87

p = 0.79

CP2

n = 50

9.0 ± 6.6

0–27.1

9.2 ± 6.4

0.4–25.9

-0.1 ± 1.8

-4.0–3.4

0.96

p = 0.53

CP3

n = 65

5.6 ± 6.1

-1.6–27.1

7.2 ± 6.0

0.3 − 24.9

-1.6 ± 2.3

-6.7–2.9

0.93

p < 0.01

Total

n = 144

7.4 ± 6.7

-1.6–27.1

8.2 ± 6.1

0–25.9

-0.8 ± 2.6

-9.7–5.3

0.92

p < 0.01

2012–2021 (10 years measuring period)

CP1

n = 28

20.8 ± 12.8

0–49.4

19.6 ± 12.1

0–47.9

1.2 ± 4.1

-10.6–9.7

0.95

p = 0.12

CP2

n = 50

17.9 ± 11.0

0–47.8

16.8 ± 10.9

0.5–45.5

1.1 ± 2.6

-8.5–6.9

0.97

p = 0.56

CP3

n = 65

14.5 ± 15.1

-3.2–60.5

16.7 ± 14.6

0–60.5

-2.2 ± 3.0

-9.7–10.0

0.98

p < 0.01

CP4

n = 72

26.3 ± 13.5

0–52.5

25.7 ± 12.8

1.8–51.6

0.6 ± 3.4

-9.9–8.9

0.97

p = 0.13

CP5

n = 69

39.4 ± 26.8

-1.6–105.1

38.5 ± 26.1

0.3–102.2

1.0 ± 3.8

-8.6–20.1

0.99

p = 0.12

CP6

n = 89

45.9 ± 30.4

0–116.2

46.0 ± 29.8

0.8–115.6

-0.1 ± 2.4

-4.0–6.7

0.99

p = 0.15

CP7

n = 80

36.0 ± 23.4

-1.6–89.2

36.1 ± 23.1

1.8–92.0

-0.2 ± 3.3

-11.8–7.2

0.99

p = 0.58

BR1

n = 17

60.5 ± 28.6

1.6–92.3

61.1 ± 29.5

1.4–93.0

0.7 ± 4.5

-7.0–11.8

0.99

p = 0.51

BR2

n = 22

50.4 ± 40.0

3.2–125.8

58.6 ± 44.7

3.0–135.4

-8.2 ± 6.4

-22.3–0.2

0.99

p < 0.01

Total

n = 492

33.1 ± 26.4

-3.2–125.8

33.4 ± 26.7

0-135.4

-0.3 ± 3.9

-22.3–20.1

0.99

p = 0.16