VOLUME INCREMENT. 



177 



The latter point will be illustrated by giving the followin* 

 data referring to Scotch pine : — 



The first quality culminates in the year 20. 

 The second ,, ,, ,, .,25. 



The third ., ,, „ .,35. 



In the case of teak, the current annual height increment 

 generally reaches its maximum during the first five years of 

 the tree's life, frequently in the second or third year. Deodar 

 shows a height growth similar to that of spruce. Sal shows, 

 as far as is known at present, a remarkably even rate of 

 height growth up to an age of 80 or 100 years. 



Coppice shoots show, generally, the greatest height growth 

 during the first few^ years of their existence ; the rate of 

 increment begins to fall ofi' early, nor do such shoots, rare 

 cases excepted, reach the same ultimate height as seedling 

 trees. 



The lateral increment of the trunk of a tree, i.e., diameter 

 or sectional area increment, depends on the surface of the leaf 

 canopy and on its activity. Hence, free growing trees increase 

 more rapidly in diameter than those grown in dense or crowded 

 woods. At the same time, the position of the leaf surface is 

 of importance. Trees with a crown coming close to the ground 



F.il. N 



