Bark Beetle Responses to Stand Structure and Prescribed Fire at Blacks Mountain Experimental Forest, California, USA: 5-Year Data

Fire Ecology

Table 2 Parameters of prescribed burn treatments applied to 12 experimental units at Blacks Mountain Experimental Forest, California, USA.

Variable	Block 1	Block 2	Block 3
Burn parameters
Date	25 September to 5 October 1997	1 to 4 November 1999	18 to 19 October 2000
Fire direction	Head, backing and spot fires	Head, backing and spot fires	Head, backing and spot fires
Climatic conditions*
Temperature (°C)	6.7 – 24.4	6.1 – 20.0	7.2 – 18.3
Dew point (°C)	−10.0 – 7.2	−9.4 – 3.3	−5.0 – 3.9
Relative humidity (%)	15 – 61	18 – 73	25 – 59
Wind speed (kmh)	1.6 – 18	0 – 18	0 – 13
Fuel moisture (mean % ± SEM)
Duff (<20 mm)	14.3 ± 2.1	39.2 ± 2.8	39.2 ± 2.2
6 mm to 25 mm	10.5 ± 1.3	18.2 ± 1.1	18.1 ± 1.1
25 mm to 75 mm	16.7 ± 1.6	22.6 ± 2.5	23.9 ± 1.5
>75 mm	18.8 ± 2.4	26.2 ± 2.7	23.9 ± 2.6