SYLVICULTURE. 



Yellow Poplar 2,000 to 4,000 ft. 



Buckeye 3,000 to 6,000 ft. 



Red Oak 2,000 to 5,500 ft. 



White Oak 2,000 to 5,000 ft. 



Spanish Oak 2,000 to 3,800 ft. 



Post Oak 2,000 to 3,000 ft. 



Black Oak 2,000 to 3,600 ft. 



Echinata 2,000 to 2,600 ft. 



Rigida 2,000 to 3,500 ft. 



Pungens 4,500 ft. 



Locust 2,000 to 5,500 ft. 



Black Gum 2,000 to 4,000 ft. 



Every species thrives best in certain centers, which are few in 

 the case of the exacting and numerous in the case of modest 

 species like yellow Pine, both east and west. 



Aside from vertical and horizontal elevation, the influence on 

 distribution exercised by storm, snow and sleet is very marked. 



Paragraph VI. Light demanders and shade bearers. 



A. A plant is termed the more shade bearing or tolerant of 

 shade, the less light it requires for the functions of assimilation, 

 breathing, perspiration, flowering and fruiting. Only parasites live 

 without light, and hence without chlorophyl. 



B. The following characteristics, in their aggregate and not 

 singly, may lead the observer to classify a tree as a shade-bearer: 



I. Dense leaf canopy. 



II. Leaves thin, dark, flat, more numerous, not glossy, not 

 downy, not bunched at the ends of the branches, with blades spread 

 horizontally, withering quickly after separation from the branch. 



III. Thin bark. 



IV. Thick sapwood. 



V. Branches persistent, spread flat or pointing downward, com- 

 paratively thin and interlacing. Crowns long. 



VI. Little live soil cover, and a heavy layer of dead humus 

 underneath leaf canopy. 



VII. Dense stand of trees. 



C. Factors influencing the relative demand for light within one 

 and the same species are: 



I. Latitude and hence intensity of insolation. 



II. Exposure. 



III. Fertility of soil, and hence digestive power. 

 TV. Age of plants. 



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