Research Article

Relative Contributions of Forest Vegetation, Land Cover, Topography and Climate in Explaining Fire Regime Patterns (1974–2005) in Peninsular Spain

Table 3

Eigenvalues obtained for the canonical and the free axis in the RDA analyses performed for the 15 territories. The part on the right shows the ranking and the contribution as a percentage (Lambda A, conditional effects when incorporated in the model) of the best explanatory variables (up to six) selected by the forward selection method. These variables are those displayed in the ordination diagrams and were found to be statistically significant. The number before each variable code indicates the group to which it belongs: (1) type of forest vegetation, (2) type of land cover, (3) topographic characterization, and (4) climatic characterization.

Territory typeAxes eigenvaluesExplanatory variable rank order and contribution in RDA models
CanonicalFreeRatio123456
#Abbreviation11 + 233 + 4(%)Name %Name %Name %Name %Name %Name %

1P. unc./A. al.0,250,260,450,63413-Elev_avg94-Prec_var71-Scler_BA61-Conif_#4
2F. syl.0,450,470,430,49973-Elev_avg172-Wd_For123-Elev_dev74-Wind_avg24-Prec_var74-Prec_avg3
3J. thu.0,140,200,510,67302-For_are92-Dec_Wd72-Con_Wd4
4Q. rob.0,400,450,440,50882-Shr_Nwd234-Prec_var82-For_are62-Wd_For41-Conif_#24-Wind_avg2
5Q. pyr.0,400,420,450,52814-Prec_avg243-Elev_avg92-Wd_For53-Elev_dev21-Scler_BA22-Con_Wd2
6Q. fag.0,230,240,510,64382-For_are133-Elev_avg73-Slo_ran3Scler_BA2
7Q. ile.0,310,400,450,53752-Wd_For173-Elev_avg132-For_are43-Elev_ran44-Wind_avg24-Prec_avg2
8Q. rot. ms./N.0,160,190,580,70272-For_are53-Slo_ran54-Wind_avg64-Temp_max34-Temp_avg21-Conif_#2
9Q. rot. su.0,120,160,590,71224-Prec_avg42-For_are33-Slo_dev43-Elev_avg32-Wd_For21-Decid_#2
10Q. rot. ms./Ac.0,140,140,650,76192-For_are74-Prec_avg24-Temp_avg33-Elev_dev2
11Q. rot. ms./Ba.0,110,140,600,74194-Elev_avg62-For_are33-Slo_avg22-Agr_Nwd22-Con_Wd2
12Q. rot. ms./S.0,190,210,620,71292-For_are104-Temp_avg33-Elev_ran33-Elev_avg34-Temp_max2
13Q. rot. th. 0,360,390,470,54724-Prec_var172-For_are102-Con_Wd54-Wind_max43-Elev_ran4
14Q. sub.0,200.220,580,68332-For_are103-Elev_dev53-Elev_avg32-Dec_Wd32-Wd_For2
15Q. coc.0,210,260,510,63422-For_are83-Slo_avg92-Dec_Wd54-Wind_avg33-Elev_avg2