A Simple Technique to Estimate the Flammability Index of Moroccan Forest Fuels

Table 5

Regression coefficient characteristics of the flammability index (FI) equations determined for Moroccan species as a function of the moisture content H (in absolute value), (FI=𝑎+𝑏H), and their hypothetical moisture of extinction ME (in %) at FI ≤ 1.

Tree/shrub species	FI-equation			Hypothetical moisture of extinction ME (%) at FI ≤ 1
	𝑎	𝑏	𝑅^2
Acacia  mollissima	3,667	−1,119	0.85	≥238
Arbutus  unedo	3,333	−0,961	0.90	≥ 243 (58–96%)*
Buscus  balearica	3,815	−1,607	0.80	≥175
Cedrus  atlantica  Manetti.	4,795	−3,448	0.82	≥110
Cistus  albidus  L.	3,915	−1,289	0.96	≥226
Cistus  crispus  L.	3,387	−1,835	0.91	≥130
Cistus  ladaniferus  L.	3,120	−1,449	0.96	≥146
Cistus  monspeliensis  L.	3,772	−1,744	0.91	≥159
Cistus  salviifolius  L.	3,160	−1,476	0.95	≥146 (>112%)*
Cupressus  sempervirens  L.	4,389	−2,576	0.83	≥132 (>117%)*
Erica  arborea  L.	3,492	−3,445	0.73	≥72 (>87%)*
Eucalyptus  camaldulensis  D.	4,446	−2,112	0.91	≥163 (>140%)*
Halimium  halimifolium	3,773	−2,579	0.94	≥108
Juniperus  thurifera  L.	3,672	−1,857	0.78	≥144
Lavandula  stoechas  L.	3,469	−1,475	0.83	≥167
Myrtus  communis  L.	3,071	−1,330	0.67	≥156
Olea  europea  L.	3,252	−1,419	0.84	≥159 (70–120%)*
Phyllerea  angustifolia  L.	3,921	−1,640	0.82	≥178
Pinus  brutia  Ten.	3,572	−1,977	0.78	≥130 (81–130%)*
Pinus  canariensis  L.	3,840	−2,399	0.95	≥118
Pinus  coulteri	3,788	−2,331	0.91	≥120
Pinus  halepensis  Mill.	3,660	−1,979	0.86	≥134 (89–138%)*
Pinus  pinaster  var.  maritima	3,511	−1,557	0.85	≥161
Pistacia  lentiscus	3,930	−2,270	0.82	≥129 (80–85%)*
Quercus  faginea	3,960	−1,284	0.96	≥230
Quercus  suber  L.	4,333	−1,597	0.57	≥209
Stipa  tenacissima  L.	3,844	−3,733	0.61	≥76
Teline  linifolia  L.	4,132	−1,593	0.78	≥197
Tetraclinis  articulata	4,083	−2,815	0.83	≥110
Thymelaea  lythroides  L.	4,426	−2,903	0.80	≥120
Viburnum  tinus  L.	3,800	−1,901	0.86	≥147

*The data between parenthesis correspond to the moisture of extinction determined by Dimitrakopoulos and Papaioannou [23].