Table 2 Summary of the plot-level variables that were used to fit the models of height-diameter relationships, where n is the number of plots

Abies alba

5638

789 (14, 3910)

34.6 (0.5, 110.6)

26.5 (8.2, 85.3)

33 (0, 200)

10.9 (4.8, 15.9)

708 (330, 1494)

Acer campestre

4168

1006 (14, 5740)

25.5 (0.5, 117.6)

19.7 (8.2, 60.8)

18 (0, 184)

13.2 (8.5, 16.6)

511 (315, 1133)

Acer monspessulanum

613

1117 (14, 4244)

17.7 (0.4, 53.4)

14.8 (7.6, 51.8)

27 (0, 120)

14.3 (8.8, 17.0)

490 (295, 843)

Acer opalus

713

1222 (33, 4067)

26.4 (0.4, 76.1)

17.4 (7.6, 58.1)

54 (0, 120)

12.0 (7.4, 15.6)

664 (364, 1153)

Acer pseudoplatanus

3076

813 (14, 5586)

27.6 (0.4, 110.6)

23.2 (7.6, 83.6)

24 (0, 200)

11.9 (3.4, 16.9)

601 (272, 1714)

Alnus glutinosa

1601

879 (14, 4322)

26.7 (0.4, 131.9)

21.6 (7.6, 70.7)

9 (0, 90)

13.4 (8.8, 17.8)

521 (293, 1196)

Arbutus unedo

582

1339 (88, 4391)

21.3 (0.4, 102.7)

14.8 (7.6, 44.7)

37 (0, 100)

15.6 (10.2, 18.5)

399 (186, 726)

Betula pendula

6161

905 (14, 5586)

24.6 (0.4, 99.2)

20.3 (7.6, 72.3)

13 (0, 196)

12.7 (4.5, 15.9)

505 (322, 1282)

Carpinus betulus

11 998

863 (14, 5586)

25.8 (0.4, 117.6)

22.1 (7.6, 86.0)

10 (0, 200)

13.2 (8.3, 16.1)

492 (324, 1145)

Castanea sativa

7857

933 (14, 5901)

28.7 (0.4, 129.3)

22.5 (7.6, 139.0)

21 (0, 185)

13.8 (9.0, 17.6)

506 (273, 1009)

Corylus avellana

3343

928 (88, 6254)

24.4 (0.4, 93.3)

19.3 (7.6, 50.9)

21 (0, 184)

12.9 (4.9, 17.0)

542 (288, 1302)

Crataegus monogyna

2107

906 (39, 4360)

23.6 (0.4, 129.3)

18.7 (7.6, 116.7)

17 (0, 190)

13.5 (9.0, 18.2)

497 (232, 1121)

Fagus sylvatica

14 152

737 (14, 5694)

28.8 (0.4, 112.7)

26.3 (7.6, 156.9)

26 (0, 200)

12.0 (4.7, 16.2)

600 (325, 1714)

Fraxinus excelsior

8175

859 (14, 4322)

25.7 (0.4, 117.6)

21.6 (7.6, 82.6)

21 (0, 200)

12.9 (6.7, 17.9)

545 (319, 1494)

Ilex aquifolium

797

936 (62, 3573)

31.8 (0.6, 88.9)

22.4 (8.5, 57.0)

26 (0, 174)

13.2 (7.9, 16.2)

547 (303, 1221)

Larix decidua

842

656 (14, 3331)

28.0 (0.4, 116.8)

26.5 (7.6, 76.7)

46 (0, 110)

9.1 (3.0, 15.1)

574 (355, 1142)

Picea abies

5627

819 (14, 4155)

34.4 (0.4, 121.0)

25.8 (7.6, 84.0)

28 (0, 111)

10.9 (3.4, 15.6)

728 (324, 1619)

Picea sitchensis

339

723 (14, 2741)

35.0 (1.7, 88.3)

27.8 (9.0, 57.2)

11 (0, 72)

12.4 (7.8, 14.7)

516 (326, 1002)

Pinus halepensis

1134

680 (14, 3565)

16.9 (0.4, 58.4)

20.5 (7.6, 69.0)

26 (0, 175)

16.1 (12.5, 18.5)

383 (186, 619)

Pinus nigra

1271

803 (14, 3890)

23.1 (0.4, 108.3)

20.5 (7.6, 68.8)

30 (0, 184)

12.9 (7.5, 17.0)

512 (342, 881)

Pinus nigra var. corsicana

1081

776 (14, 3173)

27.1 (0.4, 97.9)

23.6 (7.6, 130.5)

18 (0, 90)

13.2 (7.2, 16.3)

466 (303, 989)

Pinus pinaster

4379

653 (14, 4106)

23.4 (0.4, 130.8)

24.7 (7.6, 103.6)

9 (0, 130)

14.9 (9.8, 18.2)

456 (223, 784)

Pinus sylvestris

7891

798 (14, 3890)

25.9 (0.4, 108.3)

22.2 (7.6, 72.8)

25 (0, 200)

12.4 (4.5, 16.8)

512 (324, 1218)

Pinus uncinata

511

721 (14, 4002)

25.3 (0.5, 72.7)

23.1 (8.6, 59.5)

44 (0, 110)

7.7 (2.8, 13.0)

592 (399, 1279)

Populus tremula

2938

975 (14, 5586)

25.0 (0.4, 99.2)

19.7 (7.6, 66.2)

10 (0, 115)

13.2 (6.5, 17.1)

488 (319, 1714)

Populus spp.

526

833 (14, 3282)

25.4 (0.5, 100.4)

22.4 (8.6, 121.0)

3 (0, 50)

13.7 (10.8, 16.3)

430 (319, 740)

Prunus avium

4058

896 (14, 5586)

26.3 (0.5, 101.9)

21.3 (7.8, 74.4)

19 (0, 184)

13.2 (7.7, 16.9)

516 (332, 1714)

Pseudotsuga menziesii

2619

738 (14, 3590)

30.2 (0.5, 130.8)

25.2 (7.9, 66.3)

19 (0, 154)

12.6 (8.5, 16.1)

553 (324, 1179)

Quercus ilex

2979

1177 (14, 5040)

18.4 (0.4, 104.2)

14.8 (7.6, 70.7)

33 (0, 175)

15.3 (7.6, 18.4)

438 (189, 817)

Quercus petraea

13 779

759 (14, 5740)

25.7 (0.4, 104.2)

24.7 (7.6, 91.2)

14 (0, 200)

13.1 (7.5, 16.3)

489 (321, 1045)

Quercus pubescens

7765

960 (14, 4360)

19.9 (0.4, 104.2)

17.5 (7.6, 85.8)

28 (0, 175)

14.3 (7.4, 18.2)

480 (263, 1003)

Quercus pyrenaica

713

693 (14, 4106)

22.7 (0.5, 70.6)

23.6 (8.6, 81.8)

12 (0, 92)

14.8 (12.4, 16.2)

484 (324, 869)

Quercus robur

17 579

745 (14, 4322)

25.1 (0.4, 111.7)

24.2 (7.6, 110.3)

11 (0, 190)

13.6 (7.6, 17.8)

482 (298, 1139)

Quercus rubra

421

820 (14, 3119)

23.5 (0.6, 88.9)

21.0 (8.2, 56.5)

7 (0, 68)

13.7 (10.4, 16.1)

483 (326, 989)

Quercus suber

436

667 (14, 3820)

19.0 (0.5, 102.7)

22.3 (8.0, 69.8)

30 (0, 80)

16.7 (14.1, 18.5)

373 (202, 611)

Robinia pseudoacacia

2082

931 (28, 3814)

24.5 (0.4, 90.9)

19.6 (7.8, 59.0)

16 (0, 141)

14.1 (9.7, 18.1)

490 (323, 983)

Salix caprea

2293

998 (14, 5737)

21.3 (0.4, 117.6)

17.5 (7.6, 55.6)

15 (0, 177)

12.5 (5.6, 17.3)

524 (321, 1340)

Salix cinerea

502

839 (53, 4123)

19.7 (0.4, 73.3)

18.4 (7.6, 55.9)

10 (0, 84)

13.9 (5.5, 16.7)

557 (317, 949)

Sorbus aria

1969

1109 (39, 4597)

26.1 (0.4, 95.3)

18.2 (8.0, 52.2)

38 (0, 132)

11.8 (4.9, 16.3)

616 (369, 1397)

Sorbus aucuparia

705

953 (79, 3716)

29.2 (0.4, 116.8)

20.8 (8.0, 47.4)

36 (0, 106)

9.9 (3.4, 16.4)

733 (339, 1376)

Sorbus torminalis

1968

945 (39, 3291)

25.7 (0.4, 101.9)

20.2 (8.0, 54.8)

12 (0, 185)

13.9 (10.3, 16.1)

457 (324, 915)

Tilia cordata

1006

843 (26, 3910)

27.0 (1.0, 81.5)

23.3 (8.6, 86.9)

18 (0, 141)

13.1 (9.2, 17.1)

501 (297, 986)

Tilia platyphyllos

908

947 (14, 4597)

29.4 (1.7, 90.5)

22.4 (8.5, 72.6)

35 (0, 185)

12.6 (7.6, 16.5)

648 (325, 1161)

Ulmus minor

1387

938 (14, 3993)

23.6 (0.4, 89.9)

19.0 (7.6, 62.5)

12 (0, 85)

14.0 (9.6, 17.9)

443 (239, 885)