RECENT TRENDS EN FOREST LAND AND TIMBER RESOURCES 



31 



Table 21. — Growing stock inventories, by species and diameter classes, 1970 



[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 



Cvpress 



Other 



Total 



Eastern hardwoods: 



Select white and red oaks 



Other oaks 



Hickory 



Hard maple 



Ash, walnut, and black cherry. . 



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 



74, 622 



17, 322 



8,348 



5,034 



12, 193 



20, 988 



11, 199 



2,394 



1,040 



5,640 



13, 790 

 2, 962 



1, 152 

 718 



2, 119 



23, 154 

 2,370 

 2, 192 

 1, 545 

 2,582 



11,549 

 637 



1,364 

 914 



1, 180 



5,006 

 154 



1, 133 

 655 

 625 



136 



114 



162 



46 



117,519 



41,261 



20, 741 



31, 843 



15, 644 



7,573 



458 



32, 613 

 38, 796 

 12, 582 

 11,732 

 12, 185 

 8,566 

 3,249 

 77, 953 



8,358 

 10, 364 



3, 699 



4, 148 

 4,033 

 1,692 

 1,038 



27, 944 



5, 148 



6, 149 

 2, 143 

 1,907 

 2, 201 

 1,250 



538 

 13, 737 



9,232 



10, 525 



3,548 



2,840 



3,353 



2, 685 



835 



19, 250 



5,490 

 6,474 

 1,914 

 1, 667 

 1,683 

 1,791 

 476 

 10, 091 



3,888 

 4,644 

 1, 176 

 1, 106 



861 

 1,053 



332 

 6,301 



498 



639 



103 



64 



54 



94 



30 



629 



197, 676 



61, 276 



33, 073 



52, 267 



29, 587 



19, 362 



2, 111 



96, 861 

 47, 540 

 45, 326 

 38, 292 

 26, 296 

 8,337 

 4,428 

 47, 275 



8, 160 



2,788 



5,865 



3,304 



2 422 



526 



96 



14, 695 



5,544 

 2,396 

 3,536 

 2,252 

 1,656 

 416 

 109 

 6, 805 



12, 406 

 5,765 

 6, 999 

 5, 340 

 3,964 

 1, 042 

 315 

 9,043 



12, 176 

 6,690 

 6,342 

 5,827 

 4, 114 

 1,052 

 417 

 4,841 



22, 985 



15, 447 



11,437 



11,823 



6,933 



2,242 



1,079 



6,242 



35, 589 

 14, 454 

 11, 147 

 9,746 

 7,206 

 3,0^8 

 2,412 

 5,649 



314, 355 



37, 858 



22, 715 



44, 874 



41, 460 



78, 187 



89, 261 



19, 330 



5, 559 



2, 755 



4,562 



2,840 



2,829 



783 



648, 879 



145, 955 



79, 284 



133, 546 



89, 531 



107, 951 



92,613 



Note: Data may not add to totals because of rounding. 



Closer utilization of the roundwood delivered to 

 sawmills and other plants has been made possible 

 by a number of technological and economic devel- 

 opments. Widespread installation of log debarkers 

 and chippers at sawmills has permitted production 

 of bark-free chips of high quality and relatively 

 low cost compared with roundwood. Recent 

 installation of chipping headrigs in sawmills has 

 also helped increase chip output. New technology 

 in pulping with continuous digesters has provided 

 added opportunities for use of sawdust and other 

 fine residues. Enactment of State laws controlling 

 disposal of waste material by burning or dumping 

 also has stimulated the search for uses of waste 

 materials. 



Primary Plant Residues 



In spite of the rapid grow r th in use of the by- 

 products of primary manufacture of wood prod- 

 ucts, volumes of unused residues were still sizable 

 in 1970. Almost one billion cubic feet (more than 



12 million cords) of material was left unused at 

 sawTnills and other primary manufacturing plants 

 (table 24). 



About two-thirds of this unused material was 

 softwoods (fig. 16). About 40 percent of this soft- 

 wood volume (3.4 million cords) was chippable 

 residues, that is, slabs, edgings, and other coarse 

 material. Most of this volume was on the Pacific 

 Coast, although there w-ere also substantial vol- 

 umes in the South and Rocky Mountains (Append. 

 I, table 43). Coarse hardwood residues in the 

 East totaled about 132 million cubic feet (1.7 

 million cords) . 



Unused sawdust and other fine residues amounted 

 to 7.4 million cords in 1970. Unused plant 

 residues in 1970 were largely at some distance 

 from markets or in areas where supply currently 

 exceeded demand. Use of residues is increasing 

 rapidly, however, and it seems likely that within 

 the next decade or so most of the coarse softwood 



