94 



TIMBER TRENDS IN THE UNITED STATES 



Table 65. — Volume of growing stock, by species and diameter classes, January 1, 1963 



[Million cubic feet] 



Species 



All 

 diameters 



5.0 to 

 9.0 



inches 



9.0 to 



11.0 



inches 



11.0 to 



15.0 

 inches 



15.0 to 



19.0 

 inches 



19.0 to 



29.0 

 inches 



29.0 



inches 



and larger 



Eastern softwoods: 



Southern pines 



Spruce and fir 



White and red pines 



Cypress 



Other 



Total 



Eastern hardwoods: 



Select white and red oaks__ 



Other oaks, .. 



Hickory 



Hard maple 



Ash, walnut, and black cherry 



Sweetgum 



Yellow-poplar 



Yellow birch 



Other 



Total 



Western softwoods: 



Douglas-fir 



Western hemlock 



True firs 



Ponderosa and Jeffrey pines 



Spruce - 



White and sugar pines 



Redwood 



Other 



Total 



Western hardwoods 



All species 



60,354 



13,055 



6,245 



3,961 



10,379 



93 , 994 



28,563 

 32,407 

 11,076 

 10,378 

 10,054 

 10,024 

 6,753 

 4,854 

 62,452 



176,561 



106,073 

 49,902 



48,244 

 45,448 

 28,883 

 9,052 

 5,542 

 46,944 



340,088 



17,239 



627,882 



17,946 

 8,090 

 1,638 



757 

 4,717 



11,757 



2,207 



940 



581 



1,692 



18,584 

 2,030 

 1,802 

 1,302 

 2,304 



8,683 

 585 



1,032 

 733 

 976 



3,294 

 142 

 741 

 478 

 626 



33,148 



17,177 



26,022 



12,009 



5,281 



7,438 

 8,891 

 3,206 

 3,202 

 3,160 

 2,590 

 1,339 

 1,500 

 23,141 



4,742 

 5,276 

 1,879 

 1 , 711 

 1,847 

 1,647 

 1.008 

 829 

 10,952 



8,052 

 8,378 

 3,009 

 2,491 

 2,875 

 2,980 

 2,075 

 1,093 

 14,454 



4,624 

 5,337 



1,742 

 1,616 

 1,469 

 1,784 

 1,406 

 690 

 8,118 



3,223 



4,017 



1,136 



1,273 



663 



959 



840 



670 



5,173 



54,467 



29,891 



45,407 



26,786 



17,954 



7,636 



,840 



6,140 



3,617 



2,310 



519 



283 



11,461 



5,973 

 2,024 

 3,909 

 2,503 

 2,262 

 420 

 208 

 6,147 



12,253 

 5,825 

 6,985 

 5,520 

 4,667 

 1,135 

 489 

 8,360 



12,319 

 5,991 

 6,429 

 6,075 

 4,431 

 1,091 

 463 

 5,599 



25,374 



15,614 



11,629 



14,490 



7,602 



2,495 



1,248 



8.112 



34,806 



23,446 



45,234 



42,398 



86,564 



5,710 



2,759 



4,014 



2,397 



1, 



128,131 



73,273 



120,677 



83,590 



111,679 



90 



1 



92 



110 



64 



357 



484 



508 



104 



85 



40 



64 



85 



72 



614 



2,056 



42,518 



17,608 



13,152 



13,243 



7,611 



3,392 



2,851 



7,265 



107,640 



479 



110.532 



because of end-use requirements. Proportions of 

 the different log grades in southern pines, for 

 example, are estimated as follows: 



Grade: Percent 



1 3 



2 19 



3 ; 48 



4 30 



Total 100 



A relatively small part of the volume of southern 

 pine is now concentrated in larger diameters 

 above 15 inches (fig. 42). West of the Mississippi 

 River the diameter distribution of southern pines 

 is the most favorable. East of the Mississippi 

 volumes of timber above 15 inches are limited, 

 but supplies of smaller timber are now sufficient 

 to sustain the present cut and permit some buildup 

 in numbers of the larger trees. 



The new southern pine plywood industry is 

 expected to utilize mainly the larger sizes of grade 

 2 and 3 logs, which now make up about two-thirds 

 of the volume of southern pine sawtimber. These 

 log grades, except when coarse-grained, are also 

 well adapted to production of dimension lumber. 

 Southern pines also produce a sizable proportion 

 of clear wood in trees no more than 20 inches in 

 diameter. 



Diameter Distribution of Douglas-fir and 

 Ponderosa Pine Dominated by Large Timber 



More than 40 billion cubic feet of Douglas-fir, 

 or 40 percent of the total volume of this species, is 

 made up of trees 29 inches in diameter and larger 

 (table 65 and fig. 42). It is this concentration in 



