4 BULLETIN 1003, U. S. DEPARTMENT OF AGRICULTURE. 



ARIZONA AND NEW MEXICO. 



Total area in the national forests acres 3 4, 571, 425 



Total stand in the national forests board feet— 17, 002, 000, 000 



Total annual cut (1917) do 154,207,815 



Total area annually cleared (if clear cutting is em- 

 ployed) acres__ 38, 574 



Total annual volume of stumpwood cords 4 77, 148 



For average stands the number of trees over 18 inches varies from 

 85 to 12, and the number of those over 24 inches varies from 7 to 9 ; 

 heavy stands have from 12 to 30 trees 18 inches and over, and from 

 11.5 to 20 trees 24 inches and over. 



Since 500 board feet is a liberal average volume for a yellow-pine 

 tree 22 inches in diameter at breast height, or 24 inches on the stump 

 (3, 13), stands of 5,000 feet an acre would contain 10 trees averaging 

 24 inches on the stump. The average stand over Arizona and New 

 Mexico being approximately 4,000 board feet for all the area covered 

 with yellow pine, the average number of 24-inch stumps an acre would 

 be 8. Many thousands of acres show stands above 5,000 feet, the 

 actual number of trees 24 inches and over being from 10 to 15 to the 

 acre. 



It is evident, therefore, that this region has future possibilities 

 from the standpoint of wood by-products, if it is found that a fair 

 percentage of the stumps are rich in resin. No account has been 

 taken of the material obtainable from "fat" limbs or "pitchy" butts, 

 and only the timber on national forests, where accurate cruises 

 have been made, is here considered. Though no figures are avail- 

 able for the timber on private holdings, Indian lands, and the pub- 

 lic domain, it is known that these areas are quite extensive, and many 

 of the stands are average or better. 



CALIFORNIA. 



Total area acres— 10,000,000 



Total stand board feet__ 85,000.000,000 



Total annual cut (1917) do 154,297,815 



Total area annually cleared (if clear cutting- 

 is employed) L acres 38,574 



Total annual volume of stumpwood : cords 4 77, 148 



California has about 10,500,000 acres of commercial yellow pine, 

 with from 85,000,000,000 to 90,000,000,000 board feet, or from 8,000 

 to 12,000 board feet an acre. Trees above 12 inches in diameter, breast 

 high, have an average diameter of 38 inches, or approximately 41 

 inches on the stump, for which reason the yellow-pine trees of Cali- 

 fornia are the largest known. Since the species usually grows in 

 mixed stands, the number of trees an acre is low. The pitch content, 

 however, is higher than that in any other section. As the yellow 

 pine in California is the heaviest known (Table 1), the amount of 

 "pitchy" wood can safely be taken as average or better. 



3 National forests only. 4 For reducing factors see Table (i. 



