Table 5 .--Estimates of logging residues to a 4-inah top, 

 in pieces 6 feet and longer, 1969 



State 



Volume 



Number of trees 

 measured with 

 sound residue 



Total number 

 of trees 

 measured 



(B) 



(A) 

 (B) 



MCF 



Percent 



Western South Dakota 



Wyoming 



Utah 



Colorado 



226.13 

 1,353.85 



637.69 

 2,115.95 



100 

 109 

 71 



257 



211 

 161 

 82 

 286 



47 



68 

 87 

 90 



Residue Volumes in Pieces 6 Feet and Longer 



Estimates of the cubic-foot volumes of logging residues to a 4-inch top are pre- 

 sented in table 5. The estimates were developed according to tfie following procedures. 



All product trees except aspen which were part of the logging residue samples 

 were measured in place and after bucking from the last cut made for products to a 

 4-inch top. Net volumes were calculated and totaled only for sound pieces (no rot 

 present) 6 feet and longer, for each State. The total of these volumes was then ex- 

 pressed as a percent of the total net product volume sampled for each State, and this 

 percent was applied to the total volume of saw logs harvested in 1969. The resulting 

 estimates represent rot-free residues. Additional residue volume is often available 

 in the form of trees damaged by felling and skidding but left in the woods either 

 standing or down. 



The number of product trees having sound pieces of unused wood 6 feet and longer, 

 when compared to the total number of product trees measured, may be indicative of the 

 degree of utilization. When these comparisons are expressed as percentages, they 

 range from 47 percent in South Dakota to 90 percent in Colorado; this suggests that 

 utilization in South Dakota is better than in Colorado. 



Information on the number of growing stock trees harvested or destroyed Cand, 

 therefore, removed from inventory) by diameter class is essential for computing the 

 diameter class cutting rates used in most stand-table projections of growth and 

 inventory (fig. 3). Reliable data of this kind are usually difficult to obtain. 

 However, these studies provide an estimate of the distribution of trees removed in 

 relation to volume of saw logs harvested. Table 6 shows the total number of growing 

 stock trees (product trees and other) removed per 1 MCF of product volume. 



Diameter Class Distribution of Trees 

 Harvested or Destroyed 



7 



