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LIFE HISTORY OF LODGEPOLE PINE IN ROCKY MOUNTAINS. 31 
DENSELY STOCKED STANDS. 
Table 8 shows the yield of stands which are densely stocked, but 
not so crowded as to cause stagnation of growth. The figures were 
obtained on the Deerlodge National Forest on the best quality of 
site. Most of the sample areas measured were 1 acre each. 
TABLE 8.—Average yield per acre of densely stocked stands of lodgepole pine at 
different ages on the best sites (Quality I), Deerlodge National Forest, 
Mont. 
Trees per acre. | A ver- Annual growth. 
; Basal age ee 
oles . diame | height, Yield. 
years. || 5 Entire | Main 2” | main Peri Peri- 
feet. | stand.1| stand Seri stand. Mean. | odie, | Mean. | odie 
Bye See 106 | 1,550 50 ip SON [rustle AO OP ee ars cee lids TBs te | ea coer Pane nee an (A Sa 
Bis & Sons Ss 128 | 1,250 175 7.5 BGG 2, ZOOM Soe setae: 45 ol eS ere ics bres 
Se eee 144 |} 1,000 225 lent 56 | 3,100) 4,800 52 85 SOs |e ae ate 
(()) ae 156 825 255 8.1 60 | 3,800] 6,200 54.3 70 89 140 
BUS =o 166 725 280 8.5 64} 4,350] 7,500 54. 4 55 94 130 
eats Spe 174 650 300 8.8 66 | 4,900 | 9,000 54.5 55 100 150 
OO 2s oe 180 600 320 9.0 68 | 5,400 | 10,800 54 50 108 180 
PEO Foe 5 Fs. 184 535 330 9.4 70 | 5,800 | 12,600 53 40 115 180 
J eee 188 500 345 9.6 72 | 6,200 | 14,800 52 40 123 220 
3 eee 192 460 390 10.0 74 | 6,550 | 17, 200 50 35 132 240 
LE Se eee 194 430 355 10.3 75 | 6,850 | 19,800 49 30 141 260 
HO aln ee tci2 196 415 360 10.5 76 | 7,150 | 22,200 48 30 148 240 
OO ay 5502 198 400 370 10.6 77 | 7,400 | 25,000 46 25 156 280 
1 Includes all trees 3 inches and over in diameter, breast high. 
2 Tncludes all trees 7 inches and over in diameter, breast high. 
3 To a 6-inch top diameter limit. 
NORMAL STANDS. 
Normal stands are those which at maturity give the maximum yield 
possible to obtain under a given method on a given quality site. In 
the case of lodgepole pine properly or normally stocked stands are 
rare. Reconnaissance data, covering many thousands of acres of 
young growth in Montana, show that nearly 80 per cent of the area 
is overstocked, and that on the average the young growth is from one- 
half to six-tenths normally stocked. Because of its slow mortality 
lodgepole must start in comparatively open stands in order to yield 
the maximum amount of merchantable material at maturity. Such 
stands, however, are not dense enough to insure rapid, natural prun- 
ing. As already pointed out, the number of trees per acre adopted 
as the criterion of normality is 1,000 at 10 years, 500 at 30 years, 300 at 
90 years, and 250 at 140 years. With these figures as a guide, and tak- 
ing into account the total yield of the stand, Table 9 has been con- 
structed from the figures obtained from those plots in Table 8 on 
which the stocking appeared to be most nearly normal. The amount 
of data is not sufficient to make the table anything more than indica- 
_ tive of what may be expected from normal stands of different ages on 
the best and on average sites. The original figures were secured on 
_ quality I sites, and the yields for quality II sites have been derived by 
