MANAGEMENT PLANS THE NATIONAL FOEESTS 



63 



Table 5. — Stand per acre in mixed type of Engelmann spruce, lirriber pine, and 



Douglas -fir 



[Based on strip surveys aggregating 12 acres, Catamount Creek unit, T. 13 S., R. 69 W.] 





Volume cut 



Volume left 



Kind of timber 



Trees 



Saw 

 timber 



Ties 1 Total 



Trees 



Saw 

 timber 



Ties 



Total 



Poles 

 6 to 10 

 inches 



Sap- 

 Ungs 



Seed 

 lings 



Engelmann spruce 



X/imber pine 



Num- 

 her 

 8 

 9.8 



Board 

 feet 

 326 

 236 



Num-\ Board 

 her feet 

 8.9 593 

 8 9 ^'}. 



Num- 

 ber 

 7.6 

 14 9 



Board 

 feet 



110 

 137 



Num- 

 ber 

 5.9 

 5.4 

 3.0 



Board 



feet 



181 



272 



227 



15 

 30 



5 



80 



515 



10 



175 

 255 



Douglas fir 



3.8 



169 1 .S. i 1 262 1 6.6 



15 







1 1 





Total - 



21.6 



731 



20.9 1 1,357 j 29.1 



251 



14.3 



680 



50 



605 



445 















GROV/TH 



A summary of growth experiments in heavy Douglas fir and Engelmann 

 spruce, conducted by the Fremont experiment station, indicates a mean annual 

 increment of 175 board feet per acre. This is the total increment. It is 

 probable that the total increment on the average acre in the "Woodland circle 

 is about 87 board feet (half of the Fremont figure). But, because of waste 

 in logging and from natural causes, it is probable that the figure of 45 more 

 nearly approaches the annual marketable growth per acre. 



Table 6. — Growth in Douglas fir virgin stands RS, Mc-4, Fremo7it Experiment 



Station 



[The figures are for the period of seven years, 1916-1923. Location T. 14 S., R. 68 W.] 



Data 



Douglas 

 fir 



Engel- 

 mann 

 spruce 



Western 



yellow 



pine 



Limber 

 pine 



Aspen 



AU 

 species 



Number of trees, 1916 



362 



460 

 2.98 

 3.23 

 336.4 

 400.2 

 9.4 



9.1 



2.8 



2.7 



3 



4.30 

 4.42 

 3.76 

 3.95 

 .03 



.03 



57 



3.91 



3.99 



82.46 



8L12 



.92 



236 

 2.23 

 2.49 

 70.96 

 69.48 

 L66 



-.07 



2.3 



-.1 



1,118 



Average d. b. h., 1916 



Average d. b. h., 1923 



Volume cubic feet, 1916 (gross) 



7.09 

 7.37 

 1,950.5 

 2, 119. 7 

 29.6 



27.2 



L5 



L4 



4.68 

 4.99 



2,444 



2,674 

 41.6 



33 



Oross volume cubic feet, 1923 



Gross volume increment per acre annum.. 



Net volume racrement (gross less dead) per 



acre annum . .... 



Per cent increase gross volume per acre 

 annum 



Per cent increase, net volume' per "acre" 

 annum 



.8 

 .8 



1.1 



L7 

 L35 



Since the plot is 0.918 acre, the growth figures of all species, when increased 

 to an acreage basis, show that 45.32 cubic feet is the gToss increment and 

 35.94 cubic feet is the net increment per acre annum. 



The plot was laid out in a north slope stand of Douglas fir at an elevation of 

 9,100 feet at the Fremont Experiment Station. The mature stand is 265 years 

 old and 78 per cent is Douglas fir over 6 inches d. b. h. An understory of 

 poles and saplings about 70 per cent Engelmann spruce, is present. Repro- 

 duction seems to be balanced between Douglas fir and Engelmann spruce. The 

 site conditions are good. 



