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Table 2 Minimum balanced structure areas (BSA, hectares) and structure tree numbers (BSN) that provide a nearly balanced Three-cm DBH-class distribution (with C[DC × N] < −0.99) in the interval of 12 to 57 cm

From: Estimating balanced structure areas in multi-species forests on the Sierra Madre Occidental, Mexico

Tree species

BSA 0.025 [ha]

Mean BSA [ha]

BSA 0.975 [ha]

BSN 0.025

Mean BSN

BSN 0.975

Absolute frequency [N]

Area [ha]

Stand density [N/ha]

1

2

3

4

5

6

7

8

9

Pinus oocarpa Schiede ex Schltdl.

3.30

7.16

13.30

73

161

303

409

14.80

28

Abies durangensis Martinez

1.85

6.14

11.25

88

264

510

1,169

24.40

48

Quercus castanea Née

0.85

6.29

23.20

74

265

935

1,328

26.45

50

Quercus chihuahuensis Trel.

1.45

6.35

15.65

79

247

625

1,317

32.15

41

Quercus eduardii Trel.

2.80

7.68

14.45

82

133

225

945

46.25

20

Quercus candicans Née

1.55

5.25

17.35

78

203

832

2,455

56.85

43

Quercus crassifolia Humb.& B.

1.00

4.14

12.50

83

201

759

3,426

60.00

57

Cupressus lindleyi Klotzsch ex Endl.

2.75

9.90

19.00

83

217

442

1,658

63.15

26

Quercus grisea Liebm.

0.95

7.52

18.95

85

370

932

3,391

64.45

53

Quercus obtusata Humb.& B.

1.15

7.31

25.55

79

314

1,066

3,273

66.65

49

Quercus resinosa Liebm.

1.45

10.62

40.95

84

388

1,635

5,985

145.25

41

Quercus conzattii Trel.

0.80

6.56

27.75

79

243

793

7,725

151.95

51

Pinus engelmannii Carrière

1.85

24.79

96.45

77

849

3,255

6,599

176.05

37

Quercus rugosa Née

1.25

4.61

16.15

77

160

481

8,194

180.70

45

Pinus herrerai Martinez

0.70

27.81

112.80

86

1,697

7,743

13,017

193.40

67

Pseudotsuga menziesii Franco

1.00

5.50

18.45

82

238

906

11,026

203.65

54

Quercus cocolobifolia Trel.

0.90

4.07

17.00

79

189

756

21,747

374.65

58

Pinus lumholtzii BL Rob. & Fernald

1.00

15.72

119.20

81

540

3,773

25,078

472.00

53

Pinus leiophylla Schltdl. & Cham.

0.40

9.36

51.80

80

579

2,956

43,415

494.95

88

Pinus arizonica Martinez

0.50

12.20

104.10

81

694

5,013

44,992

544.85

83

Juniperus spp

3.10

10.66

44.10

78

200

772

13,101

589.75

22

Pinus ayacahuite Ehrenb. ex Schltdl.

1.35

11.36

121.55

82

513

5,929

49,054

1,087.45

45

Quercus sideroxyla Humb. & B.

0.60

5.64

30.40

89

467

2,332

124,687

1,246.00

100

Pinus teocote Schltdl. & Cham.

0.60

11.24

106.55

82

752

7,074

113,782

1,308.45

87

Pinus durangensis Martinez

0.55

12.37

116.35

84

998

8,981

179,036

1,577.05

114

  1. In the form of the mean minimum balanced structure areas (mean BSA) and the mean minimum balanced structure tree numbers (mean BSN), the 95% confidence intervals of minimum balanced structure areas (BSA 0.025; BSA 0.975) and minimum balanced structure tree numbers (BSN 0.025; BSN 0.975), the smallest and largest minimum balanced structure areas (BSA min; BSA max), and minimum balanced structure tree numbers (BSN min; BSN max) of the conifer and oak species attaining a C[DC × N] < −0.99 including all plots as well as the absolute frequency (tree number), area, and stand density over all sample plots
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Annals of Forest Science

ISSN: 1297-966X