APPENDIX 



Glossary of Terms 



Acceptable tree. Growing-stock tree of commercial 

 species that meets specified standards of size and quality, 

 but not qualifying as desirable tree. 



Allowable harvest. The volume of timber that would be 

 cut on commercial timberland during a given period under 

 specified management plans aimed at sustained production 

 of timber products. 



Coarse residue. Plant residue that is suitable for chip- 

 ping, such as slabs, edgings, and veneer cores. 



Commercial timberland. Forest land producing or 

 capable of producing crops of industrial wood and not 

 withdrawn from timber utilization. (Note: Areas quali- 

 fying as commercial timberland have the capability of 

 producing in excess of 20 cubic feet per acre per year of 

 industrial wood in natural stands. Currently inaccessible 

 and inoperable areas are included, except when the areas 

 involved are small and unlikely to become suitable for 

 production of industrial wood in the foreseeable future.) 



Cord. A pile of stacked wood containing 128 cubic feet 

 within its outside surfaces. The standard dimensions are 4 

 by 4 by 8 feet. 



Cropland. Land under cultivation within the past 24 

 months, including cropland harvested, crop failures, culti- 

 vated summer fallow, idle cropland used only for pasture, 

 orchards, and land in soil improving crops, but excluding 

 land cultivated in developing improved pasture. 



Deferred forest land. National Forest land that meets 

 productivity standards for commercial timberland, but 

 under study for possible inclusion in the Wilderness 

 System. 



Desirable tree. Growing-stock tree (a) having no 

 serious defects in quality limiting present or prospective 

 use for timber products, (b) of relatively high vigor, and 

 (c) containing no pathogens that may result in death or 

 serious deterioration before rotation age. (Note: This is 

 the type of tree forest managers try to grow; that is, the 

 tree favored in cultural operations. In over-rotation-age 

 stands, desirable trees are low-risk trees.) 



Diameter classes. A classification of trees based on 

 diameter outside bark, measured at breast height (4-J^ 

 feet above the ground). (Note: D.b.h. is the common ab- 

 breviation for diameter at breast height. Two-inch diam- 

 eter classes are commonly used in Forest Survey, with 

 the even inch the approximate midpoint for a class. For 

 example, the 6-inch class includes trees 5.0 through 6.9 

 inches d.b.h., inclusive.) 



Farm. A place of 10 or more acres from which the sale of 

 agricultural products totaled $50 or more annually, or a 

 place of less than 10 acres from which the sale of agricul- 

 tural products totaled $250 or more during the previous 

 year. 



Farm and miscellaneous lands. Privately owned lands 

 other than in forest industry ownership. 



Fine residues. Residues not suitable for chipping, such 

 as sawdust, shavings, and veneer clippings. 



Forest land. Land at least 10 percent occupied by forest 

 trees of any size, or formerly having had such tree cover, 



310 



and not currently developed for nonforest use. (Note: 

 The minimum area for classification of forest land is 1 acre. 

 Roadside, streamside, and shelterbelt strips of timber 

 must have a crown width at least 120 feet wide to qualify 

 as forest land. Unimproved roads and trails, streams, or 

 other bodies of water or clearings in forest areas are classed 

 as forest if less than 120 feet in width.) Also see definitions 

 for land area, commercial timberland, noncommercial 

 forest land, productive-reserved forest land, stocking, and 

 unproductive forest land. 



Forest site productivity class. A classification of forest 

 land in terms of potential cubic-foot volume growth per 

 acre at culmination of mean annual increment in fully 

 stocked natural stands. 



Forest type. A classification of forest land based upon 

 the species forming a plurality of live-tree stocking. Type 

 is determined on the basis of species plurality of all live 

 trees that contribute to stocking. 



Growing-stock trees. Live trees of commercial species 

 qualifying as desirable or acceptable trees. Excludes rough, 

 rotten, and dead trees. 



Growing-stock volume. Net volume in cubic feet of 

 growing-stock trees 5.0 inches d.b.h. and over from a 1-foot 

 stump to a minimum 4.0-inch top diameter outside bark of 

 the central stem or to the point where the central stem 

 breaks into limbs. 



Growth impact. Mortality plus growth loss. 



Growth loss. Timber loss due to (a) delay in restocking 

 or deficiencies in stocking resulting from damage by 

 insects, disease, animals, fire, or adverse weather, and 

 (b) the reduction in growth due to changes in timber 

 type, defoliation, reduction of tree vigor, increase in cull 

 percent, or deterioration of site due to destructive agents. 



Hardwoods. Dicotyledonous trees, usually broad-leaved 

 and deciduous. 



Indian lands. Tribal lands held in fee by the Federal 

 Government, but administered for Indian tribal groups, 

 and Indian trust allotments. 



Industrial wood. All roundwood products, except fuel- 

 wood. 



Ingrowth. The number or net volume of trees that grow 

 large enough during a specified year to qualify as saplings, 

 poletimber, or sawtimber. 



Land area. 



a. Bureau of the Census. The area of dry land and land 

 temporarily or partly covered by water, such as 

 marshes, swamps and river flood plains (omitting 

 tidal flats below mean high tide) ; streams, sloughs, 

 estuaries and canals less than V% of a statute mile 

 in width; and lakes, reservoirs and ponds less than 

 40 acres in area. 



b. Forest Survey. Same as the Bureau of the Census 

 except minimum width of streams, etc. is 120 feet 

 and minimum size of lakes, etc. is 1 acre. 



Limbwood. That part of the tree above the stump which 

 does not meet the requirement for saw logs and upper- 

 stem portions, including all live, sound branches to a 

 minimum of 4 inches outside bark. 



