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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
  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