Fire Ecology

Table 3 Influence of ignition pattern on plant life form richness and fire severity at two prairies in the south Puget Sound, Washington, USA, in 2011 and 2012. For each prairie, two values are reported: the indicator value (IndVal) of each plant life form group (N = native, E = exotic, A = annual, P = perennial, G = grass, F = forb, S = shrub) and fire severity class. Asterisks (*) denote significant relationships (P < 0.05) between ignition pattern and either plant life form group or fire severity.

From: Ignition Patterns Influence Fire Severity and Plant Communities in Pacific Northwest, USA, Prairies

		Glacial Heritage		Tenalquot
Treatment	Life form grouping	IndVal	P	IndVal	P
Backing fire	EAF	49.79	0.59	60.42	0.01*
	EAG	6.69	0.91	16.64	0.17
	EPF	49.75	0.62	54.05	0.01*
	EPG	43.98	0.87	49.24	0.68
	EPS	19.23	0.26	4.67	0.54
	NAF	46.71	0.52	49.45	0.17
	NPF	33.68	1.00	65.36	0.01*
	NPG	47.84	0.91	52.91	0.20
	Fire severity class
	Unburned	0.35	0.95	8.42	0.67
	Scorched	19.41	0.73	49.68	0.18
	Light	40.75	0.97	49.33	0.36
	Moderate	89.77	<0.01*	26.99	0.84
	Heavy	0.00	1.00	4.99	0.41
Head fire	Life form grouping
	EAF	50.21	0.57	39.58	1.00
	EAG	23.32	0.10	2.18	0.98
	EPF	50.25	0.46	45.95	1.00
	EPG	51.85	0.18	50.76	0.55
	EPS	7.24	0.90	1.61	0.90
	NAF	46.71	0.51	38.58	0.82
	NPF	66.32	0.01*	33.13	1.00
	NPG	52.16	0.27	45.04	0.93
	Fire severity class
	Unburned	18.08	0.04*	13.20	0.43
	Scorched	32.40	0.24	29.22	0.81
	Light	55.05	0.04*	46.67	0.64
	Moderate	5.84	1.00	47.30	0.17
	Heavy	4.76	0.42	1.46	0.71

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