Decade-Long Plant Community Responses to Shrubland Fuel Hazard Reduction

Wilkin, Katherine M.; Ponisio, Lauren C.; Fry, Danny L.; Tubbesing, Carmen L.; Potts, Jennifer B.; Stephens, Scott L.

doi:10.4996/fireecology.130210513

Fire Ecology

Table 5 Non-native abundance model estimates with standard error and P-value for the main effects and interaction (treatment by years since treatment). Different letters depict significant differences in shrub cover at α ≤ 0.05. Numbers depict marginal significant levels 0.05 ≤ α ≥ 0.10. Significance codes: * <0.001, <0.01, * <0.05, . <0.1. Estimates (Est), standard errors (± SE), and P-values (P) are rounded to the nearest one hundredth. P-value of *** implies P-value <0.001. Harmfulness rating is from the California Integrated Pest Management and is based on a combination of ecological impact, invasive potential, and current distribution (Bell et al. 2015). The base harmfulness rating in these models is “None.”

From: Decade-Long Plant Community Responses to Shrubland Fuel Hazard Reduction

				Control		Fire-fall		Fire-winter		Fire-spring		Mastication-fall		Mastication-spring
				Est ± SE	P	Est ± SE	P	Est ± SE	P	Est ± SE	P	Est ± SE	P	Est ± SE	P
Main effect	Intercept			34.84±5.97	***	38.81±9.50	_***	18.03±8.69	0.04*	14.12±8.89	0.11	92.94±9.20	_***	47.06±7.79	_***
	Yr since treatment			−0.16±5.96	0.98	−1.12±1.53	0.46	0.20±1.59	0.9	0.92±1.95	0.64	−1.33±1.27	0.30	0.48±1.15	0.68
	Control
	Fire-fall			3.97±10.55	0.71
	Fire-winter			−16.82±9.8	0.09.	−20.79±9.78	0.03*
	Fire-spring			−20.72±9.88	0.04*	−24.69±10.10	0.01*	−3.91±9.53	0.68
	Mastication-fall			58.09±10.42	***	54.12±10.06	***	74.9±9.56	***	78.81±9.98	***
	Mastication-spring			12.21±9.22	0.19	8.25±9.32	0.38	29.02±8.75	***	32.93±9.14	***	−45.88±8.62	***
	Limited			4.30±3.52	0.22	4.30±3.52	0.22	4.30±3.52	0.22	4.30±3.52	0.22	4.30±3.52	0.22	4.30±3.52	0.22
	Moderate			−32.44±10.04	***	−32.81±9.38	***	−17.65±10.16	0.08.	−16.42±11.9	0.17	−72.91±6.89	***	−40.97±6.29	***
	High			−18.40±8.23	0.03*	−21.00±7.81	0.01**	−16.86±8.51	0.05*	−15.41±8.19	0.06.	−65.92±7.09	***	−39.95±6.83	***
	Survey precipitation			−35.91±14.28	0.01*	−29.20±7.66	***	−15.49±11.98	0.20	−19.94±12.33	0.11	-75.36±7.09	***	−46.13±6.61	***
Treatment × yr since treatment	Control		AB
	Fire-fall		AB	−0.96±6.09	0.87
	Fire-winter		AB	0.37±6.10	0.95	1.33±1.75	0.45
	Fire-spring		AB	1.08±6.22	0.86	2.04±2.11	0.33	0.71±2.14	0.74
	Mastication-fall		A1	−1.17±6.02	0.85	−0.21±1.41	0.88	−1.53±1.45	0.29	−2.24±1.87	0.23
	Mastication-spring		B1	0.64±6.00	0.91	1.60±1.37	0.24	0.28±1.41	0.84	−0.44±1.84	0.81	1.81±0.95	0.06.
Treatment × harm fulness rating	Limited	Control	AB
		Fire-fall	AB	−0.38±13.75	0.98
		Fire-winter	A1	14.77±14.20	0.30	15.14±13.82	0.27
		Fire spring	A1	16.02±15.41	0.30	16.39±15.12	0.28	1.23±15.62	0.94
		Mastication-fall	C	−40.47±12.17	***	−40.10±11.64	***	−55.26±12.28	***	−56.49±13.75	***
		Mastication-spring	B1	−8.54±11.84	0.47	−8.16±11.29	0.47	−23.32±11.95	0.05.	−24.55±13.46	0.07.	31.94±9.33	***
	Moderate	Control	AB
		Fire-fall	A1	−2.60±11.33	0.82
		Fire-winter	A	1.54±11.84	0.90	4.14±11.54	0.72
		Fire-spring	A	2.99±11.57	0.80	5.59±11.31	0.62	1.44±11.81	0.90
		Mastication-fall	C	−47.52±10.84	***	−44.92±10.55	***	−49.06±11.08	***	−50.51±10.82	***
		Mastication-spring	B1	−21.54±10.66	0.04*	−18.95±10.37	0.07.	−23.08±10.91	0.03*	−24.54±10.67	0.02*	25.97±9.84	0.01*
	High	Control	AB
		Fire-fall	A1	6.72±16.17	0.68
		Fire-winter	A	20.41±18.66	0.27	13.70±14.21	0.34
		Fire-spring	A1	15.97±18.52	0.39	9.26±14.44	0.52	−4.47±17.16	0.79
		Mastication-fall	C	−39.45±15.93	0.01*	−46.16±10.44	***	−59.88±13.92	***	−55.42±14.21	***
		Mastication-spring	B1	−10.22±15.7	0.51	−16.94±10.11	0.09.	−30.64±13.67	0.02*	−26.19±13.96	0.06.	29.23±9.69	***

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