Ecological Archives E085-017-A1

Anselm Rodrigo, Javier Retana and F. Xavier Picó. 2004. Direct regeneration is not the only response of Mediterranean forests to large fires. Ecology 85:716–729.

Appendix A. Regression equations between tree cover (in percentage) and stem density (per ha) for the different tree species considered.

Species
N
R2
P
Regression equation
Density for 10% cover

Pinus halepensis
2661
0.60
0.001
Density = 44.9 + 13.4 Cover
179

Pinus nigra
2023
0.69
0.001
Density = 5.3 + 18.9 Cover
195

Pinus pinaster
255
0.53
0.001
Density = 168.2 + 13.4 Cover
302

Pinus pinea
995
0.60
0.001
Density = 24.0 + 6.7 Cover
91

Pinus sylvestris
3203
0.66
0.001
Density = 53.6 + 12.2 Cover
176

Quercus cerrioides
2868
0.70
0.001
Density = 58.4 + 12.5 Cover
184

Quercus ilex
4304
0.76
0.001
Density = 73.1 + 19.8 Cover
271

Quercus suber
1034
0.49
0.001
Density = 86.3 + 11.2 Cover
198

   Note: The number of plots used in the calculations (N), R2 and P values of each equation, and tree density (stems/ha) corresponding to 10% of tree cover are also indicated.


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