Figure 1. — Aein^at photograph of study oj'eo. showing a'Leosrsvj:, strips and treatment aji'ea.s. 



(Courtesy Potlatch Forests , Inc.) 



Cutting did not extend to the crest of the ridge, so the top of each cut strip \\as 

 bordered by uncut timber. Timber from the study area was cat -skidded in tree- lengths 

 to landings at the foot of the strips. During the fall of 1954, several site preparation 

 treatments were carried out to test their effectiveness in promoting subsequent natural 

 regeneration on the clearcut strips. 



STUDY METHODS 



Site-preparation treatments assigned to the clearcut strips were as follows: 



1. Control--no further disturbance. 



2. Prescribed broadcast burning. 



3. Light scarif ication--25 o of the area bulldozer-scarified. 



4. Moderate scarification--50% of the area bulldozer-scarified. 



5. Heavy scarif ication--75% of the area bulldozer-scarified. 



Some seed had been already dispersed by trees in the uncut strips before site 

 preparation began. Broadcast burning was done on September 10, early in the seed dis- 

 semination season. Scarification was accomplished during the period of September 10 to 

 September 18, 1954 with a D-7 crawler tractor equipped with a brush blade. Heavy slash 

 accumulations from the bulldozer work were burned in late September and early October, 

 probably after seed dissemination was nearly complete. 



We have no seedfall records on the study area itsexf, but records were kept from 

 1952 to 1960 on a 15-acre clearcut block located about 1/2 mile north and at a slightly 



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