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 1 Western 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	22	294	98	22	360	212	22	30	257	149	30	820	391	219	< 0.001	26	244	93	26	472	194	93	0.391	< 0.001
	2	28	197	141	28	225	139	14	18	207	89	18	797	382	284	< 0.001	23	166	92	23	393	200	137	0.027	< 0.001
	3	12	125	64	12	114	41	−9	13	130	88	13	541	240	316	< 0.001	12	83	29	12	318	131	283	0.004	0.019
Shrub biomass	1	7	2945	1902	22	1363	1669	−54	16	3180	1984	30	139	323	−96	0.062	9	5572	4769	27	3464	4279	−38	0.033	< 0.001
	2	15	2322	2185	28	1247	1739	−46	9	2157	1704	18	116	166	− 95	0.001	15	2675	2249	23	2082	2401	−22	0.664	< 0.001
	3	9	942	1088	12	546	541	−42	7	1042	747	13	483	1047	−54	0.947	7	1006	1388	12	757	1505	−25	0.495	0.714
Shrub 1-h	1	7	1376	918	22	709	770	−48	16	1525	1014	30	97	172	−94	0.058	9	2773	2225	27	1871	1997	−33	0.045	0.001
	2	15	1068	1001	28	582	778	−45	9	1077	903	18	71	91	−93	0.002	15	1291	1079	23	1121	1226	−13	0.449	< 0.001
	3	9	420	500	12	248	259	−41	7	502	392	13	238	512	−53	0.952	7	462	638	12	377	703	−18	0.438	0.647
Shrub 10-h	1	7	1596	1233	22	606	784	−62	16	1441	1112	30	46	129	−97	0.178	9	2754	2602	27	1541	2061	−44	0.019	< 0.001
	2	15	1341	1528	28	715	1200	−47	9	903	680	18	37	66	−96	< 0.001	15	1417	1432	23	1021	1239	−28	0.931	< 0.001
	3	9	540	738	12	286	331	−47	7	512	403	13	304	683	−41	0.590	7	589	866	12	422	880	−28	0.547	0.997
DWD 10-h	1	22	614	297	22	708	308	15	30	784	299	30	323	196	−59	< 0.001	27	701	516	27	895	479	28	0.106	< 0.001
	2	28	769	434	28	866	450	13	18	718	443	18	446	282	−38	0.012	23	724	439	23	1218	581	36	0.020	< 0.001
	3	12	632	458	12	829	310	31	13	527	310	13	581	429	10	0.842	12	815	753	12	2070	1412	140	0.005	0.001
DWD 100-h	1	22	1494	1177	22	1033	832	−31	30	2088	1338	30	893	849	−57	0.803	27	1303	1008	27	1769	912	36	0.011	0.001
	2	28	1843	1203	28	1450	1095	−21	18	1624	1397	18	1225	939	−25	0.892	23	1673	1117	23	4013	1862	140	< 0.001	< 0.001
	3	12	1278	835	12	965	627	−24	13	1247	1222	13	1680	2141	35	0.721	12	1259	1220	12	6084	3228	383	< 0.001	< 0.001

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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