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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
  1. 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