100 



THE SELECTION METHOD 



cuttings, growth retarded due to shade and a relatively small 

 increment of valuable material. 



1320' 



FIG. 35. 



A 4o-acre portion of a stand of virgin timber to be reproduced under the 

 group selection method. Four groups are represented in the diagram. _ Length 

 of rotation is 200 years; length of cutting cycle 50 years. The oldest group is 

 cut clear except for a few trees shown ^in the diagram left to furnish seed over 

 the central part of the area. Such seed trees are needed because the group is 

 too broad to be adequately reproduced from seed distributed from trees in 

 adjoining groups. The principal difference between this operation and the 

 method of clearcutting the whole stand lies in the difference in size of the unit 

 of management (i.e., the stand). See page 13. 



