Figure 3. — Vvehuvned slash measurements being taken on clearcut 12, June 26, 1975. 



Note relatively light fuel volume. 



Approximately 1 hour prior to the ignition of each fire, samples of the following 

 material were gathered at each of the permanent points: 



1. Duff (upper and lower half sampled separately) 



2. Downed woody material in the 0-0.25 inch (0-0.64 cm) and 0.25-1 inch 

 (0.64-2.54 cm) diameter size classes 



3. Herbaceous vegetation. 



Samples were weighed, dried, and reweighed to determine the preburn water 

 content of each. 



After the fires, the plots were relocated and the following measurements were 

 taken: 



1 . Duff depth 



2. Mineral soil exposure (percent of area) 



3. Weight per unit area of each of the five diameter size classes of downed 

 woody material 



4. Depth of downed woody material. 



Each of the preburn measurements was designed as a potential independent variable 

 for a regression analysis on duff reduction and mineral soil exposure. 



6 



