Characteristics of Burns Conducted under Modified Prescriptions to Mitigate Limited Fuels in a Semi-Arid Grassland

Fire Ecology

Table 2 Parameter estimates and standard errors for generalized linear models predicting mean peak fire temperature (°C), heat duration (seconds above 60 °C), and heat dosage₀ (°C·sec; calculated with a baseline of 0 degrees) as a function of fuel load, wind speed, air temperature, relative humidity, and scale of the burn (0 = small scale, 1 = large scale) in shortgrass steppe of northeastern Colorado. The magnitude of effect for each parameter refers to the difference between the predictions for the maximum versus minimum value of that parameter.

Model parameter	Units	Range evaluated			Peak temperature (°C)			Heat duration (sec)			Heat dose₀ (°C·sec)
Model parameter	Units	Min.	Mean	Max.	Parameter estimate	1SE	Effect size	Parameter estimate	1SE	Effect size	Parameter estimate	1SE	Effect size
Intercept					18.90			11.3			−15 47.8
Fuel load	kg ha⁻¹	97	614	1 175	0.12	0.01	131.4	0.08	0.02	81.9	10.0	2.0	10 819
Wind speed	m sec⁻¹	1.35	4.06	10.82	6.10	2.39	37.8	−0.41	1.30	24.9	−43.4	125.8	1 414
(Wind − 4.06)²	m sec⁻¹				−0.56	0.42		−0.49	0.38		−24.3	33.6
Air temperature	°C	10.8	17.8	25.1	0.78	0.68	11.0	0.58	0.73	8.3	136.1	108.1	1 932
Relative humidity	%	6.9	16.5	33.5	−0.17	0.28	4.5	0.09	0.27	2.3	8.8	30.5	233
Scale	(0,1)	0		1	7.52	4.43	7.5	−5.67	4.64	−5.7	−327.2	445.2	327