APPENDIX 



225 



canals, and nonforest strips must be more than 120 feet 

 wide, and clearings in forest areas must be more than 1 

 acre in size, to qualify as nonforest land. 



Nonstocked Areas. Commercial forest land less than 

 10 percent stocked with growing-stock trees. 



Old-Growth Sawtimber Stands. Sawtimber stands in 

 which 50 percent or more of the net board-foot volume is 

 in old-growth sawtimber trees. 



Old-Growth Sawtimber Trees. Trees that have reached 

 or passed rotation age. 



Ownership. The property owned by one owner, includ- 

 ing all parcels of land in the United States. 



Pasture and Rangeland. Land which is currently im- 

 proved for grazing by cultivation, seeding, or irrigation, 

 and natural grasslands that never supported tree growth. 



Plant Byproducts. Wood material from primary manu- 

 facturing plants (such as slabs, edgings, trimmings, miscuts, 

 sawdust shavings, veneer cores and clippings, and pulp 

 screenings) that are used for some product. 



Plant Residues. Wood materials from primary manu- 

 facturing plants that are not used for any product. 



Poletimber Stands. Stands at least 10 percent stocked 

 with growing-stock trees, of which half or more of the 

 stocking is sawtimber and/or poletimber trees with pole- 

 timber stocking exceeding that of sawtimber. (See defi- 

 nition of stocking.) 



Poletimber Trees. Live trees of commercial species at 

 least 5.0 inches in diameter breast height but smaller 

 than sawtimber size, and of good form and vigor. 



Productive-Reserved Forest Land. Productive public 

 forest land withdrawn from timber utilization through 

 statute or administrative regulation. 



Realizable Growth. The net annual growth of timber 

 that would be attained if the better present-day forestry 

 practice in the various regions were extended to all com- 

 mercial forest land. 



Rotten Cull Trees. Live trees of commercial species 

 that do not contain a saw log now or prospectively, pri- 

 marily because of rot (e.g., when rot accounts for more 

 than 50 percent of the total cull volume). 



Roundwood Products. Logs, bolts, or other round sec- 

 tions cut from trees. 



Salvable Dead Trees. Standing or down dead trees 

 that are considered currently or potentially merchantable 

 by regional standards. 



Sampling Error. The probable maximum error of an 

 estimated total or average that arises from taking a 

 sample rather than making a complete inventory or meas- 

 urement. Sampling errors do not include technique errors 

 such as could occur in photo classification of areas, meas- 

 urement of volume, or compilation of data. 



Saplings. Live trees of commercial species 1.0 inch to 

 5.0 inches in diameter at breast height and of good form 

 and vigor. 



Sapling-Seedling Stands. Stands at least 10 percent 

 stocked with growing stock trees of which more than half 

 are saplings and/or seedlings. 



Saw Log. A log meeting minimum approved log-grade 

 specifications, or, for species for which approved log grades 

 are lacking; at least 8 feet long, with a minimum d.i.b. 

 of 6 inches, and with deduction for defect no greater than 

 two-thirds the gross volume. 



Saw-Log Portion. That part of the bole of sawtimber 

 trees between the stump and the saw-log top, that is, the 

 point on the bole above which any regionally specified 

 grade of saw log cannot be obtained. 



Sawtimber Stands. Stands at least 10 percent stocked 

 with growing-stock trees, with half or more of the total 

 stocking in sawtimber or poletimber trees and with saw- 

 timber stocking at least equal to poletimber stocking. 



Sawtimber Trees. Live trees of commerical species 

 containing at least one saw log. Softwoods must be at 

 least 9.0 inches in diameter breast height, except in Cali- 

 fornia, Oregon, Washington, and coastal Alaska where the 

 minimum diameter is 11.0 inches. Hardwoods must be 

 at least 11.0 inches in diameter in all States. 



Sawtimber Volume. Net volume of the saw log portion 

 of live sawtimber trees in board feet. 



Seedlings. Established live trees of commercial species 

 less than 1.0 inch in diameter at breast height and of good 

 form and vigor. 



Site Classes. A classification of forest land in terms of 

 inherent capacity to grow crops of industrial wood. 



Softwoods. Coniferous trees, usually evergreen, having 

 needle or scalelike leaves. 



Sound Cull Trees. (Rough Trees.) Live trees that do 

 not contain a saw log now or prospectively, primarily 

 because of roughness, poor form, or noncommercial species. 



Stand Improvement. Measures such as thinning, 

 release cutting, girdling, weeding, poisoning of cull trees 

 or pruning aimed at improving growing conditions. 



Stand-Size Classes. A classification of forest land based 

 on the predominant size of timber present, that is, saw- 

 timber, poletimber, or seedlings and saplings. 



State, County, and Municipal Land. Land owned by 

 States, counties, and local public agencies, or lands leased 

 by these governmental units for more than 50 years. 



Stocking. A measure of the degree to which forest land 

 is occupied by trees of specified classes in relation to a 

 specified basal area standard for trees 5.0 inches d.b.h. and 

 larger, or numbers of trees per acre for trees less than 5.0 

 inches; tree classes include (1) all live trees, (2) growing- 

 stock trees, and (3) desirable trees. Classifications of 

 forest land and forest types are based on stocking of all 

 live trees. Classification of condition classes is based on 

 stocking of desirable trees. 



Stocking Percentage. Current area occupancy or 

 stocking in relation to specified stocking standards. 



Stocking Standard. The minimum number or basal 

 area per acre of well spaced trees required to fully utilize 

 a forest site. 



Timber Cut from Growing Stock. The volume of sound 

 wood in live sawtimber and poletimber trees cut for forest 

 products during a specified period, including both round- 

 wood products and logging residues. 



Timber Cut from Sawtimber. The net board-foot vol- 

 ume of live sawtimber trees cut for forest products during 

 a specified period, including both roundwood products 

 and logging residues. 



Timber Products. Includes (a) roundwood products 

 such as saw logs, veneer logs and bolts, cooperage logs and 

 bolts, pulpwood, fuelwood, piling, poles, posts, hewn ties, 

 mine timbers, and other round, split, or hewn products, 

 and (b) byproducts of primary wood manufacturing plants. 



Tree Size Classes. A classification of growing stock 

 trees according to diameter at breast height outside bark, 

 including sawtimber trees, poletimber trees, saplings, 

 and seedlings. 



Unproductive Forest Land. Forest land incapable of 

 yielding crops of industrial wood because of adverse site 

 conditions. Includes sterile or poorly drained forest land, 

 subalpine forests and steep rocky areas where topographic 

 conditions are likely to prevent management for timber 

 production. 



Upper Stem Portion. That part of the bole of saw- 

 timber trees above the saw log top to a minimum top 

 diameter of 4.0 inches outside bark, or to the point where 

 the central stem breaks into limbs. 



Urban and Other Areas. Includes areas developed for 

 residential, industrial, or related purposes and all non- 

 forest land not included in any other specified land use 

 class. 



Volume of Salvable Dead Timber. Net volume of dead 

 trees, standing or down, that are considered merchantable 

 by regional standards. 



Young-Growth Sawtimber Stands. Sawtimber stands 

 in which 50 percent or more of the net board-foot volume 

 is in young-growth sawtimber trees. 



Young-Growth Sawtimber Trees. Trees that have not 

 passed rotation age. 



