Table 3. — Total volume of all trees 0.6 inch d.b.h. and larger 

 for normal white pine stands 



Age 



Site index 



50 



60 



70 



80 



Cubic feet per acre 



40 



2,270 



2,650 



3,030 



3,400 



50 



3,640 



4,210 



4,830 



5,470 



60 



5,050 



5,880 



6,710 



7,600 



70 



6,450 



7,500 



8,560 



9,730 



80 



7,750 



9,000 



10,350 



11,750 



90 



8,980 



10,450 



12,000 



13,650 



100 



10,100 



11,850 



13,500 



15,400 



110 



11,150 



13,000 



14,800 



16,850 



Source: Haig, Irvine T. Second growth yield, stand and volume tables for the 

 western white pine type. U.S. Dep. Agr. Tech. Bull. 323, 68 pp. 1932. 



ning, fully stocked western larch stands on 

 site 70 land should produce 4,682 cubic feet 

 of wood at age 50 in trees 8 inches and larger 

 and that 8-inch trees can be utilized. In other 

 words, it is expected that an additional 2,500 

 cubic feet of wood per acre will be available 

 in trees 8 inches and larger at age 50 as a 

 result of thinning. The above information is 

 shown graphically in figure 3, 



It is well to recognize the low state of the 

 art of projecting stands under different levels 

 of management. However, in ranking stands 

 for management treatment, the crudity of 

 stand projection techniques need not be a 

 serious handicap so long as there is no evidence 

 of bias. It is essential only that the procedures 

 and data used produce results that are con- 

 sistent from stand to stand. 



Estimating future wood prices is even more 

 difficult than predicting stand response to 

 treatment. No one can say definitely what 

 wood will be worth 50 or 100 years in the 

 future or how prices will vary between species. 

 After studying price trends, the manager must 

 judge what future prices are likely to be, but 

 he must recognize that his conclusion is largely 

 guesswork. 



A recent analysis of wood selling prices 

 (Research Note INT-65 in this series) indicates 

 that the hagh prices of white pine and ponder- 

 osa pine are largely the result of the demand 

 for the clear wood of these species. Unless 

 stands are pruned or rotations are lengthened, 

 the price differences between white and pon- 

 derosa pine and other species may be less in 

 the future. It is probable that species price 

 differences will be negligible in stands just 

 achieving merchantable size. However, it is 

 also probable that wood value increases with 

 tree size in some species more than in others. 



Even though species price differences have 

 been lessening in recent years, the manager 

 may still wish to recognize some differences 

 in establishing prices to be used in evaluating 

 timber growing opportunities. 



Accessibility to market may be a desirable 

 point to consider, and a range of prices by 

 species that reflects distance from principal 

 processing centers might be established. How- 

 ever, if analyses of individual stands are to be 

 comparable, the price estimates applied to 

 similar stands that are to be managed in the 

 same way must be the same. 



10 



