CORRELATION OF STUMP GROWTH WITH D.B.H. OF TREE 349 



trated in Fig. 70 for loblolly pine. These data can be obtained very 

 rapidly and without much extra cost. 



These stump tapers are then classified on the basis of stump diam- 

 eter inside bark and not on D.B.H. since they are to be plotted on the 

 curve of stump diameter. An arithmetical average of these relations 

 is obtained, and expressed in the form of Table LII (p. 350). 



31 



10 



20 30 40 



Age of Tree including Seedling 



50 



Fi.g. 70. — Diameters, inside bark at stump, outside bark at B.H., and inside bark 

 at 16 feet above stump, for trees at different ages. Loblolly pine, old fields, 

 Urania, La. 



The D.B.H. outside bark for each stump-diameter class is now 

 plotted on the curve of D.I.B. on the stump as shown in Fig. 70. Since 

 this curve is based on age of tree, the diameter at any point on the 

 bole of a tree of a given age will fall on the indicated vertical line cor- 

 responding to this age. Thus, a tree measuring 14 inches on the stump 

 in Table LII is 30 years old at the stump, and 33 years old when 

 corrected for age of seedling which is 8 years. The D.B.H. for a 14- 

 inch stump is 13.2 inches, which is plotted above 33 years. In the 

 same way, D.I.B. at the top of the first 16-foot log, which is 10.8 inches, 

 would fall above the same 33-year point on the scale. In this manner 

 the stump tapers are each plotted by first finding the corresponding 



