Reproduction of Lodgepole Pine. 19 



production in the open whenever the ground is burned over, is 

 sufficiently abundant to restock the ground, and is only too com- 

 monly more abundant than necessary for normal stocking. 



Reproduction under cover. 



In the pure Lodgepole Pine type the average of about 100 calip- 

 ered sample areas gave approximately 9,000 board feet per acre 

 and the per cent of volume composition was Lodgepole Pine 88 

 per cent, Douglas Fir and Engelmann Spruce, 12 per cent. The 

 average number of trees per acre was 93, of which Lodgepole Pine 

 86, and of incidental species 7. The average height was 76 feet; 

 the maximum height was 1 10 feet. The average diameter at breast 

 height of the merchantable trees was 12 inches; the maximum 

 diameter was 26 inches. 



The observations on aspect show this type to occupy chiefly 

 northern slopes, the next in numerical frequency being the north- 

 east and east slope. The aspect least occupied by this type was 

 the south slopes. The result of measurement of sample plots of 

 reproduction show the following per acre enumeration : 



No. per acre Per cent. 

 Douglas Fir, 79 6.30 



Lodgepole Pine, 188 15.00 



Engelmann Spruce, 95 7.57 



Limber Pine, 278 22.17 



Alpine Fir, 614 48.96 



Total per acre, 1254 100.00 



The average density was 6.95 on a scale of 10. This seems to 

 indicate that the reproduction of Lodgepole Pine under its own 

 cover is very poor and that the majority of it is of other species. 

 Limber Pine and Alpine Fir reproduction seems to be most fre- 

 quent at the higher elevations, and both re-seed the ground at con- 

 siderable distance from the parent tree. 



An average of nearly 1,000 calipered acres in the mixed Doug- 

 las Fir type showed about 7,000 board feet per acre. The volume 

 composition by species is as follows, expressed in per cent. : 



Douglas Fir, 52% 



Lodgepole Pine, 36% 



Engelmann Spruce, 



Alpine Fir & 12% 



Limber Pine, 



Total, 100% 



