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Table 3 Influence of ignition pattern on plant life form richness and fire severity at two prairies in the south Puget Sound, Washington, USA, in 2011 and 2012. For each prairie, two values are reported: the indicator value (IndVal) of each plant life form group (N = native, E = exotic, A = annual, P = perennial, G = grass, F = forb, S = shrub) and fire severity class. Asterisks (*) denote significant relationships (P < 0.05) between ignition pattern and either plant life form group or fire severity.

From: Ignition Patterns Influence Fire Severity and Plant Communities in Pacific Northwest, USA, Prairies

   Glacial Heritage Tenalquot
Treatment Life form grouping IndVal P IndVal P
Backing fire EAF 49.79 0.59 60.42 0.01*
EAG 6.69 0.91 16.64 0.17
EPF 49.75 0.62 54.05 0.01*
EPG 43.98 0.87 49.24 0.68
EPS 19.23 0.26 4.67 0.54
NAF 46.71 0.52 49.45 0.17
NPF 33.68 1.00 65.36 0.01*
NPG 47.84 0.91 52.91 0.20
Fire severity class
Unburned 0.35 0.95 8.42 0.67
Scorched 19.41 0.73 49.68 0.18
Light 40.75 0.97 49.33 0.36
Moderate 89.77 <0.01* 26.99 0.84
Heavy 0.00 1.00 4.99 0.41
Head fire Life form grouping
EAF 50.21 0.57 39.58 1.00
EAG 23.32 0.10 2.18 0.98
EPF 50.25 0.46 45.95 1.00
EPG 51.85 0.18 50.76 0.55
EPS 7.24 0.90 1.61 0.90
NAF 46.71 0.51 38.58 0.82
NPF 66.32 0.01* 33.13 1.00
NPG 52.16 0.27 45.04 0.93
Fire severity class
Unburned 18.08 0.04* 13.20 0.43
Scorched 32.40 0.24 29.22 0.81
Light 55.05 0.04* 46.67 0.64
Moderate 5.84 1.00 47.30 0.17
Heavy 4.76 0.42 1.46 0.71