^.04 



CHAPTEli l\. 



FORMATION OF MIXED WOODS. 



The various methods of foniiin;^ }i wood described in tlie 

 previous chapters of tliis part are appHeable to both pure 

 and mixed woods. There are, however, certain peculiarities in 

 the formalii)ii of mixed woods, which it will be necessary to 

 indicate. As the number of possible mixtures is very larj^e, a 

 separate reference to each is impossible. It must sufltice to 

 deal with them in the following groups : — 



1. Formation of even aged woods, or in which the ages of 



the species in mixture differ so little that they may. for 

 practical purposes, be considered as even aged. 



2. Formation of mixed woods consisting of trees of uneven 



age, such as high forest with standards, two-storied 

 high forest, etc. 



1. r'oniiatio)! ()f Ernt At/rd Mi.vcil Woods. 



In Fart I. of this volume (i)age 74). it has been explained 

 that in order to preserve mixtures in which the species are of 

 the same age, the latter should show nearly the same rate of 

 height growth throughout life. Whenever this is not the case, 

 any species sensitive to cover and likely to be outgrown by 

 associated species must be given a start, while the latter must 

 be capable of bearing the shade of the former. In the absence 

 of these conditions the species must be separated, and the 

 utmost which can be done is to place them in alternating 

 groups. Even then there is no certainty that in regenerating 

 such a wood the new crop will show the desired mixture. 

 At any rate it will be clear that the regeneration of such 

 woods requires constant attention, lest one species should 

 oust another. 



