Volume Table far Lodgepolc Pine. 327 



in the final volume table. A similar method was used in the 

 sawlog-tie-pi op table. 



In addition to the general table, a volume table which can be 

 used in working up trespass estimates, etc., was constructed 

 based on stump diameters outside bark and site qualities, after 

 the following manner: 



All stump diameters outside bark for each D. B. H. class were 

 tabulated and the average secured, (e. g., the stump d. o. b. of a 

 ii.o" D. B. H. tree was found to be 12.4"). Then on a system 

 of rectangular co-ordinates the average stump diameters out- 

 side bark were plotted as abscissae and the volumes in feet B. M. 

 for their corresponding D. B. H. (taken from the regular vol- 

 ume table based on D. B. H. and site qualities) were plotted 

 as ordinates. The values for the final stump d. o. b. table were 

 secured by reading from the curves, the volumes for the even 

 stump diam.eters. This gave immediately uniform progression 

 of values in both the vertical and in the horizontal columns. 



Conclusions. 



There are two ways of applying a site-quality volume table, 

 one of which may be used to check the other. The inexperienced 

 estimator by use of a hypsometer may take the total heights of 

 ten to twelve trees and by comparison wnth the average heights' 

 given in the table for each diameter, determine the quality of site. 

 Should very accurate results be desired, interpolation between the 

 values for two site qualities may be made. The experienced 

 man may judge site qualities by careful observation of the stand, 

 taking into account the height of the trees, the character of the 

 soil, the relative altitude, and the nature of the ground cover. 

 Since the determining factors of site quality of pine stands are 

 fertiHty, depth and moisture content of the soil, and since the 

 characteristics of the soil vary almost directly with the relative 

 altitude above the valley bottom, and since the density of the 

 ground cover is an index of the fertility of the soil, this means 

 of determining the quality is reliable and at the same time simple. 

 This makes the work progress rapidly in spite of the fact that to 

 apply this table it is necessary to make a site-quality map. As 

 mentioned before, this map is extremely valuable in reconnais- 

 sance; and the same is true in timber sale work, for when a 



