88 



THE SELECTION METHOD 



Cuttings in successive years progress from one stand to an- 

 other and finally return to the first. The interval between cuts 

 on a given area determines the length of the cutting cycle. 



FIG. 28. 



A portion (one acre) of an ideal single tree selection stand managed on a 

 rotation of 100 years under a 10 year cutting cycle. Ten age classes are rep- 

 resented each occupying approximately one-tenth of the area. The numbers 

 indicate the age of the trees. Compare with Fig. 27, where a cutting cycle 

 of one year is employed. 



In Europe this is apt to be 10 years or lower. In the United 

 States the cutting cycle may be 10 to 50 years in length. 

 Where the cutting cycle is longer than one year every age 



