DETAILS OF THE METHOD 



27 



(a) Trees standing outside (usually adjacent to) the area 

 cleared. The seed is disseminated (by wind) over the cleared 

 area most thickly close to the parent trees on the borders of 

 the clearing and in decreasing amount toward the center. 

 Reproduction arising from such seeding is apt to be too dense 

 around the edges and too sparse or lacking altogether in the 

 middle. (See Fig. 3.) 



(b) Seed stored in the duff. With some species under cer- 

 tain climatic conditions quantities of seed may accumulate in 

 the forest floor retaining vitality for many years and germi- 



Vouns Timber 



Fig. 3. 



Clearcutting the whole stand, with reproduction secured by seed disseminated 

 from seed trees located outside the stand cut. The density of the reproduction 

 five years after the cutting is indicated by the dots. 



nating when subjected to the changed conditions following a 

 clearcutting.^ Reproduction secured in this way may be 

 relatively tmiform in its distribution over large areas. 



(c) Seed stored on the trees removed in the clearcutting, or 

 recently fallen from these trees. Certain species (lodgepole 

 pine for example ") retain portions of several seed crops for 



