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Table 1 Descriptive statistics of the tree- and plot-level variables for larch and birch species in 2005–2015. The definitions of the variable abbreviations and the calculation formulas are presented in Table 2

From: Simulating the diameter growth responses of Larix gmelini Rupr. and Betula platyphylla Suk. to biotic and abiotic factors in secondary forests in Northeast China

Level

Variable

Size

Mean

Minimum

Maximum

Standard deviation

Stand

Larch stand

\({D}_{g}\)(cm)

212

12.1

5.8

28.2

3.09

\(G\)(m2/ha)

15.9

1.6

33.7

7.25

\({A}_{ge}\)

77

20

195

38.04

\(N\)(trees/ha)

1465

316

3950

710.43

\(ALT\)(m)

651

220

1190

214.83

\(SL\)(°)

6

0

28

5.28

\(ASP\)(°)

161

0

315

113.62

\({ALTL}_{CA}\)

0.72

−3.06

2.98

1.96

\({ALTL}_{TS}\)

−4.37

−619.19

21.73

41.77

\(TAI\)

0.27

0.08

0.81

0.13

\(SWI\)

0.56

0.00

1.32

0.31

\(SPI\)

0.33

0.00

0.72

0.19

\({H}_{p}\)(\(\mathrm{m}\))

13.0

1.7

26.5

3.55

\({D}_{gl}\)(cm)

12.6

5.8

28.2

3.04

\({G}_{l}\)(m2/ha)

13.2

1.0

31.7

6.42

\({G}_{LR}\)(%)

84.21

18.00

100.00

12.26

\({N}_{l}\)(trees/ha)

1486

316

3950

724.61

Birch stand

\({D}_{g}\)(cm)

168

10.6

5.9

21.6

2.63

\(G\)(m2/ha)

14.1

1.3

29.4

5.91

\({A}_{ge}\)

47

8

130

17.53

\(N\)(trees/ha)

1669

350

3350

711.50

\(ALT\)(m)

601

190

1150

182.03

\(SL\)(°)

7

1

26

4.89

\(ASP\)(°)

160

0

315

116.44

\({ALTL}_{CA}\)

1.04

−2.94

2.93

1.77

\({ALTL}_{TS}\)

−24.61

−663.05

21.54

120.48

\(TAI\)

0.31

0.09

0.95

0.15

\(SWI\)

0.48

0.00

1.36

0.31

\(SPI\)

0.28

0.00

0.71

0.19

\({H}_{p}\)(\(\mathrm{m}\))

12.10

0.80

24.00

3.38

\({D}_{gb}\)(cm)

10.51

5.90

21.60

2.64

\({G}_{b}\)(m2/ha)

11.6

1.2

23.4

4.72

\({G}_{BR}\)(%)

85.10

56.00

100.00

10.54

\({N}_{b}\)(trees/ha)

1686

350

3350

723.28

Larch-birch stand

\({D}_{g}\)(cm)

240

12.0

6.9

21.0

2.25

\(G\)(m2/ha)

17.9

2.4

30.9

5.67

\({A}_{ge}\)

59

18

167

23.95

\(N\)(trees/ha)

1661

316

3383

635.78

\(ALT\)(m)

625

235

1180

210.02

\(SL\)(°)

7

0

26

5.10

\(ASP\)(°)

155

0

315

108.29

\({ALTL}_{CA}\)

0.54

−3.00

2.96

1.98

\({ALTL}_{TS}\)

−16.66

−663.05

21.37

92.81

\(TAI\)

0.31

0.08

0.81

0.14

\(SWI\)

0.82

0.04

1.51

0.26

\(SPI\)

0.48

0.01

0.75

0.14

\({H}_{p}\)(\(\mathrm{m}\))

13.0

1.2

23.0

2.81

\({D}_{gl}\)(cm)

12.0

6.9

21.0

2.16

\({G}_{l}\)(m2/ha)

8.8

0.5

17.9

3.74

\({G}_{LR}\)(%)

47.61

4.00

64.00

11.37

\({N}_{l}\)(trees/ha)

1390

316

3383

724.61

\({D}_{gb}\)(cm)

11.9

6.9

21.0

2.32

\({G}_{b}\)(m2/ha)

8.15

0.88

15.64

3.08

\({G}_{BR}\)(%)

42.14

6.00

93.00

12.78

\({N}_{b}\)(trees/ha)

1635

316

3383

651.89

Tree

Larch

\({DBH}_{1}\)(cm)

36,158

11.2

5.0

61.7

6.53

\({DBH}_{N}\)(cm)

0.11

0.02

0.22

0.05

\({DBH}_{2}\)(cm)

12.0

5.0

61.7

6.61

\(BAL\)(m2/ha)

12.02

0.00

33.41

7.02

\({BAL}_{1}\)(m2/ha)

7.92

0.00

31.64

5.34

\({BAL}_{2}\)(m2/ha)

4.10

0.00

23.23

4.20

\(BALD\)

5.42

0.00

18.31

3.53

\({BALD}_{1}\)

3.52

0.00

16.53

2.53

\({BALD}_{2}\)

1.90

0.00

12.96

2.05

Birch

\({DBH}_{1}\)(cm)

44,224

10.1

5.0

50.3

4.52

\({DBH}_{N}\)(cm)

0.12

0.02

0.26

0.04

\({DBH}_{2}\)(cm)

10.7

5.0

50.4

4.63

\(BAL\)(m2/ha)

11.15

0.00

33.45

6.08

\({BAL}_{1}\)(m2/ha)

6.35

0.00

23.32

4.16

\({BAL}_{2}\)(m2/ha)

4.81

0.00

31.72

4.50

\(BALD\)

4.98

0.00

17.98

2.97

\({BALD}_{1}\)

2.86

0.00

12.26

2.00

\({BALD}_{2}\)

2.13

0.00

17.24

2.07