Prescribed Burning and Clear-Cutting Effects on Understory Vegetation in a Pinus canariensis Stand (Gran Canaria)

Table 2

Cutting and burning effects on species composition in Pinus canariensis forest stand (Gran Canaria, Canary Islands). Results of the SIMPER procedure conducted to identify descriptor species associated with each treatment. The taxa which contribute to the similarity within treatment, using a cut-off cumulative percentage of 90%, are listed. Av. Abund.: average abundance of taxa based on a scale of 1 to 9 (1: trace; 2: <1%; 3: 1-2%; 4: 2–5%; 5: 5–10%; 6: 10–25%; 7: 25–50%; 8: 50–75%; 9: >75%) [31]; Av. Sim.: average similarity within treatment subplots of taxa; Sim./SD: mean similarity to standard deviation ratio of taxa; Contrib. %: contribution percentage of the taxa to the similarity; Cum. %: cumulative percentage of the contribution to the similarity.

Species	Av. Abund.	Av. Sim.	Sim./SD	Contrib. %	Cum. %
Control (average similarity 54.59)
Teline microphylla (DC.) P. E. Gibbs & Dingwall	6.25	14.25	2.55	26.11	26.11
Erysimum bicolor (Hornem.) DC.	2.67	6.52	3.33	11.94	38.05
Sonchus acaulis Dum. Cours.	2.75	4.74	1.36	8.69	46.74
Silene vulgaris (Moench) Garcke	2.08	4.55	2.09	8.33	55.07
Sonchus oleraceus L.	1.83	4.53	4.67	8.31	63.38
Ranunculus cortusifolius Willd.	2.42	4.30	1.36	7.89	71.26
Todaroa montana Webb ex Christ	2.08	2.70	0.82	4.94	76.20
Galium aparine L.	1.33	2.46	0.97	4.50	80.70
Artemisia thuscula Cav.	1.25	1.38	0.64	2.53	83.23
Hirschfeldia incana (L.) Lagr.-Foss.	1.00	1.27	0.79	2.33	85.56
Ferula linkii Webb	1.17	1.23	0.53	2.26	87.82
Argyranthemum adauctum (Link) Humphries	1.00	1.16	0.53	2.13	89.94
Salvia canariensis L.	1.08	0.96	0.31	1.75	91.70
Cut (average similarity 26.30)
Teline microphylla (DC.) P. E. Gibbs & Dingwall	1.64	5.12	0.74	19.48	19.48
Silene vulgaris (Moench) Garcke	1.53	4.77	0.76	18.13	37.61
Micromeria benthamii Webb & Berthel.	1.42	3.95	0.68	15.01	52.63
Vicia disperma DC.	0.61	1.84	0.21	7.00	59.63
Erysimum bicolor (Hornem.) DC.	1.22	1.23	0.45	4.68	64.31
Sonchus acaulis Dum. Cours.	0.89	0.98	0.41	3.72	68.03
Galium aparine L.	0.83	0.92	0.44	3.49	71.52
Todaroa montana Webb ex Christ	0.92	0.81	0.42	3.08	74.60
Lathyrus annuus L.	0.69	0.75	0.38	2.86	77.46
Ranunculus cortusifolius Willd.	1.00	0.66	0.39	2.52	79.98
Sonchus oleraceus L.	0.69	0.62	0.34	2.35	82.33
Hirschfeldia incana (L.) Lagr.-Foss.	0.67	0.52	0.33	1.98	84.31
Adenocarpus foliolosus (Aiton) DC.	0.69	0.44	0.16	1.66	85.97
Stellaria media (L.) Vill.	0.64	0.42	0.30	1.59	87.56
Argyranthemum adauctum (Link) Humphries	0.75	0.40	0.30	1.54	89.09
Echium onosmifolium Webb	0.36	0.36	0.17	1.37	90.46
Burnt (average similarity 37.33)
Teline microphylla (DC.) P. E. Gibbs & Dingwall	2.11	7.20	2.39	19.27	19.27
Silene vulgaris (Moench) Garcke	2.00	6.16	1.61	16.49	35.76
Sonchus acaulis Dum. Cours.	1.56	2.84	0.71	7.61	43.37
Erysimum bicolor (Hornem.) DC.	1.58	2.79	0.70	7.48	50.85
Sonchus oleraceus L.	1.25	2.65	0.98	7.09	57.94
Hirschfeldia incana (L.) Lagr.-Foss.	1.39	2.33	0.82	6.23	64.17
Ranunculus cortusifolius Willd.	1.42	2.10	0.67	5.63	69.81
Lathyrus annuus L.	0.92	1.30	0.54	3.49	73.30
Galium aparine L.	0.78	0.83	0.44	2.24	75.53
Chamaecytisus proliferus (L. f.) Link	0.86	0.80	0.38	2.15	77.69
Todaroa montana Webb ex Christ	0.94	0.78	0.30	2.10	79.79
Centranthus calcitrapae (L.) Dufr.	0.69	0.65	0.37	1.75	81.53
Andryala pinnatifida Aiton	0.78	0.65	0.41	1.75	83.28
Argyranthemum adauctum (Link) Humphries	0.75	0.60	0.39	1.62	84.90
Echium onosmifolium Webb	1.39	0.57	0.28	1.54	86.43
Papaver rhoeas L.	0.64	0.49	0.34	1.30	87.73
Galium parisiense L.	0.67	0.48	0.33	1.29	89.02
Stellaria media (L.) Vill.	0.56	0.43	0.34	1.16	90.18