— 173 — 



Now applying this equation to the given data, we find: 

 for a stand with " a " grade ; 

 _ 44.5608 



Va=773.6e * Probable % Diff. ±1.7% 



for a stand with "b" grade; 



46.4669 



V6=777.5e * Probable % Diff. ±1.1% 



for a stand with " c " grade : 

 _ 504724 



Ve=915.4e * Probable % Diff. ±1.9% 



The following diagrams (Plate XXV) show the comparison between the 

 observed and calculated results for each stand: 



(g) On the number of trees per unit area. 



It was stated from the investigations given by Konig, Kraft and 

 Martin that the average sectional area of the crown-area of stand, says 

 K, is approximately correlated with the average basal sectional area, says 

 g, at breast height and it will be readily assumed that such a relation 

 will be represented by the equation: 



*- 9 



where A;, is the constant. 



From this last equation, we have, by integrating and transforming, 



K=kg^' 

 where k is the integral constant. 



TT 10000 Ty,k, 



Hence «;= =kg ' 



N 



. ^ j^^ _100_00_^ J, -2/c, 



<t) 



Ai 



Substituting the equations: D=Ae into the last equation, we have 



I 2fc,Ai 



