Unit boundary -- 



Scale: 10 20 Chains 

 I I 1 



Figure 1 . - -Study area . 

 STUDY METHODS 



Partial cutting. --Volume and growth of the residual trees in the partial cutting were 

 measured in 1954 by means of temporary sample plots at 14 randomly selected locations. At 

 each location data were collected on three different -sized concentric plots as follows: 



1. Residual trees 9.6 inches d.b.h. and larger were recorded on a 1/5-acre circular 

 plot, and trees 3.6 inches to 9.5 inches d.b.h. were recorded on a 1/10-acre plot. Diameter 

 at breast height, total and merchantable height, dominance, external traits of vigor, defect, 

 growth by 5 -year periods before and after logging (from increment cores), and mortality since 

 logging were determined and recorded for each tree . 



2. The reproduction (trees to 3.5 inches d.b.h.) was tallied by height and diameter on a 

 4-milacre circular sample plot. 



Clearcutting . - -Reproduction counts on the group seed -tree cuttings were made in 1954 on 

 randomly located sampling units. Each sampling unit was five 4-milacre circular sample plots 

 spaced 1 chain apart along a 5-chain segment of a line (fig. 1). On each plot, species were 

 recorded by height and diameter classes. Earlier reproduction counts had been made on 

 milacre plots^ in 1921 on the lower portion of the area, and in 1929^ counts were made over 

 all of the area except the 30 -acre partial cutting. 



2 Lowdermillc, W. C. The management of Engelmann spruce- -the basis for marking and 

 slash disposal rules. U.S. Forest Service. Unpublished typewritten report. 40 pp. 1922. 



^Dejarnette, G. M. Report on cut-over area examination. U.S. Forest Service. 

 Unpublished typewritten report. 18pp. 1931. 



2 



