Fuel bed response to vegetation treatments in juniper-invaded sagebrush steppe

Bernau, Christopher R.; Strand, Eva K.; Bunting, Stephen C.

doi:10.1186/s42408-018-0002-z

Fire Ecology

Table 3 Utah juniper woodland mean and standard deviation (SD) of fuel load (kg ha⁻¹) by fuel type pre treatment and two years post treatment

From: Fuel bed response to vegetation treatments in juniper-invaded sagebrush steppe

Fuel type	Phase	Control (C)							Prescribed burn treatment (Rx)								Mechanical treatment (M)
		Pre treatment			Post treatment			Change	Pre treatment			Post treatment			Change	C vs. Rx	Pre treatment			Post treatment			Change	C vs. M	Rx vs. M
		n	Mean	SD	n	Mean	SD	%	n	Mean	SD	n	Mean	SD	%	P value	n	Mean	SD	n	Mean	SD	%	P value	P value
Live herbaceous	1	19	322	270	19	412	335	28	19	395	312	19	1396	1146	254	< 0.001	12	198	209	12	400	303	102	0.632	0.016
	2	23	227	240	23	263	269	16	25	226	187	25	749	688	232	< 0.001	22	212	169	22	641	420	202	0.003	0.731
	3	20	115	123	20	113	128	−1	16	96	87	16	635	706	563	0.001	27	133	113	27	805	599	504	< 0.001	0.891
Shrub biomass	1	13	8445	5595	19	6232	4812	−26	16	9521	5988	19	180	285	−98	< 0.001	8	4893	2839	12	5635	2941	15	0.751	< 0.001
	2	15	4858	5501	23	3231	3360	−34	18	5522	6000	26	326	661	−94	0.002	16	2679	2039	22	3124	2596	17	0.713	< 0.001
	3	16	1164	1183	20	704	480	−39	10	1363	1846	16	112	180	−92	0.246	21	1567	2083	27	1332	1906	−15	0.076	0.002
Shrub 1-h	1	13	2869	1160	19	2177	1269	−24	16	3395	1611	19	92	163	−97	< 0.001	8	2167	956	12	2208	1165	2	0.705	< 0.001
	2	15	1664	1436	23	1254	1109	−25	18	1976	1440	26	145	280	−93	< 0.001	16	1257	854	22	1387	989	10	0.538	< 0.001
	3	16	517	468	20	413	449	−20	10	487	534	16	62	100	−87	0.068	21	456	558	27	462	595	1	0.493	0.004
Shrub 10-h	1	13	3095	1542	19	2436	1472	−21	16	3541	2053	19	41	73	−99	< 0.001	8	2176	1262	12	2526	1580	16	0.783	< 0.001
	2	15	1843	1741	23	1484	1397	−19	18	1995	1910	26	107	211	−95	< 0.001	16	1315	930	22	1449	1111	10	0.683	< 0.001
	3	16	526	509	20	363	264	−31	10	528	648	16	55	84	−90	0.120	21	539	711	27	467	686	−13	0.231	0.003
DWD 10-h	1	19	722	455	19	645	229	−11	19	651	441	19	397	396	−39	0.086	12	622	354	12	866	405	39	0.201	0.002
	2	23	622	316	23	639	240	3	26	629	277	26	626	291	−1	0.995	22	654	376	22	1332	698	104	< 0.001	< 0.001
	3	20	450	242	20	511	217	14	16	590	283	16	1066	498	81	0.021	27	474	271	27	1880	697	297	< 0.001	< 0.001
DWD 100-h	1	19	987	463	19	1306	827	32	19	1376	1388	19	662	760	−52	0.134	12	1480	1208	12	2077	1414	40	0.096	0.001
	2	23	1242	779	23	1304	782	5	26	1111	635	26	1226	800	10	0.979	22	1288	850	22	4922	3008	282	< 0.001	< 0.001
	3	20	970	695	20	1268	1022	31	16	855	613	16	1813	1118	112	0.651	27	964	793	27	4056	2709	321	< 0.001	0.002

Change is reported in percentage (%) and calculated as the pre-treatment value minus the post-treatment value, divided by the pre-treatment value; n indicates the number of samples used in the calculations. Treatments include a control (C), prescribed burning (Rx), and mechanical cut-and-leave treatment (M). P values from analysis of variance testing for treatment effects two years post treatment are reported. P values < 0.05 are in boldface

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