1,000 r 



500 



O 

 < 



cc 



LU 



Q. 



GO 



u 



2 

 -I 

 G 



LU 

 UJ 

 00 

 LL 



O 



or 

 _ 

 GQ 



D 



1,000 



500 



HEAVY SCARIFICATION 



Li 



Number of seedlings per acre 



Percent of milacre plots stocked 



-. 40 



BURN 



LIGHT SCARIFICATION 



NO TREATMENT 



20 



40 



20 



8-48 6-49 10-49 5-50 7-53 8-48 6-49 10-49 5-50 7-53 



MONTH - YEAR 



Figure 4. — Influence of seedbed on the regeneration of ponderosa pine by month and 

 year. Open bars represent number of seedlings per acre; dotted bars are the 

 percentage of milacre plots stocked. 



13 



