PLANT SUCCESSION 



231 



Quercus alba 

 



Quercus stellata 

 D 



Carya spp 

 D 



sc 



sc 



Quercus coccinea 

 D 



Quercus borealis 

 var maxima 



Quercus rubra 

 D 



Quercus marilandica 

 D 



i ! 



• i 

 i I 



li 



I 



SC 



FlG. 109. A phytographic comparison of the overstory species found in 

 the two oak-hickory climax variants of the North Carolina Piedmont. 183 

 Values for the white oak type are indicated by solid lines, for the post oak 

 type by broken lines. D— percent of total tree density, F— frequency percent, 

 SC— percent of four size classes (overstory, understory, transgressives, seed- 

 lings) in which the species was found. Zero is the center, 100 percent the 

 periphery of the circle. Only quantitative data can give information such as 

 illustrated by these phytographs. 



ferent habitats. Such methods alone have produced some excellent 

 interpretations of vegetational dynamics. General conclusions may 

 be as good as any obtained otherwise. However, there are reasons 

 why supporting data are most desirable. 



