VOLUME TABLE FOR LODGEPOLE PINE. 

 By Arthur T. Upson. 



General experience has shown that timber sale and intensive 

 reconnaissance estimates demand the use of reliable volume tables 

 for different classes of forest stands. By no other means can 

 results be obtained with certainty and as little expense. Besides 

 the elements of accuracy and uniformity, a table must involve 

 those of simplicity and ease of application. The Lodgepole pine 

 stands found growing in the Colorado Rockies are homogeneous 

 only in composition and age and vary in their physical develop- 

 ment as a result of the fertility of the soil and the relative alti- 

 tude, which conditions give rise to three site qualities. The deep, 

 moist soil at the low altitudes represents conditions for the opti- 

 mum development of the species and consequently forms' the zone 

 occupied by quality L pine; the second quality occurs under 

 the conditions represented by the thinner, drier soils of the mid- 

 dle slopes ; and the upper slopes and ridges present the conditions 

 of soil and relative altitude which induce the poorest develop- 

 ment of pine, and fix the zone occupied by site quality IIL The 

 amount of ground cover beneath the stand is a fair indicator of 

 the fertility of the soil, and consequently of the quality of the site, 

 for in I it is usually abundant and in III almost lacking. Volume 

 tables for Lodgepole pine in this region then, should be divided 

 into three site qualities. 



Such a site-quality volume table may assist in the preparation 

 of a site-quality map. 



The writer has had the opportunity during the past year to 

 gather volume data on 2015 Lodgepole pine trees on the Arapaho 

 Forest, Colorado, and to compile a volume table which gives vol- 

 umes of sawtimber and linear feet of props for each D. B. H. 

 class by three site qualities. The data were gathered in stands 

 in which cutting and logging were in progress, the measurements 

 on the entire trees just as they lay after felling and bucking into 

 logs and props, and before the swampers had an opportunity to 

 disturb the top or before the skidders removed any of the logs. 



The usual procedure in measuring was followed. 



Since in the Rocky Mountain region the smallest piece which 



