VEGETATIONAL ANALYSIS 



59 



PINE 



HARDWOODS 



39.6- 



Density-Frequency 



20.0- 



10.0- 



Overstory 



Understory 



Fig. 24. Bar diagrams of density, frequency, and basal area to compare 

 pine and hardwood development in an unburned pine stand (A), with por- 

 tions previously subjected to surface fire (B), and crown fire (C). Densities 

 are indicated by the height of the columns above the zero line and frequen- 

 cies by the width of the columns. Basal areas in square feet are indicated by 

 the length of the columns below the zero line, and the width of these 

 columns indicates percent of total basal area in the stand. Values for density 

 and absolute basal area were modified by the factor 2 ^j~y because of their 

 wide range. 



184 



]*\red unless determined with plots of equal size. The larger the 

 pots, the higher the frequency. 



'*§ Frequencies may conveniently be grouped into classes, for ex- 

 ample, A 1-20%, B 21-40%, C 41-60%, D 61-80%, E 81-100%. 



