APPENDIX II 



Definitions 



Allowable Cut. The volume of timber that may be cut 

 during a given period under specified management plans 

 for sustained production. 



Area Condition Classes. A classification of commercial 

 forest land based upon stocking by desirable trees and 

 other conditions affecting current and prospective timber 

 growth. 



Basal Area. The area in square feet of the cross section 

 at breast height of a single tree or of all the trees in a stand 

 usually expressed as square feet of basal area per acre. 



Commercial Forest Land. Forest land which is produc- 

 ing or is capable of producing crops of industrial wood and 

 not withdrawn from timber utilization by statute or admin- 

 istrative regulation. Includes areas suitable for manage- 

 ment to grow crops of industrial wood generally capable 

 of producing in excess of 25 cubic feet per acre of annual 

 growth. Includes both accessible and inaccessible areas. 



Commercial Species. Tree species presently or pro- 

 spectively suitable for industrial wood products; excludes 

 so-called weed species, such as black-jack oak and haw- 

 thorn. 



Cropland. Land under cultivation within the past 24 

 months, including cropland harvested, crop failures, culti- 

 vated summer fallow, idle cropland, cropland used only 

 for pasture, orchards and land in soil improving crops, 

 but excluding land cultivated in developing improved 

 pasture. 



_ Cull Trees. Live trees of sawtimber and poletimber 

 size that are unmerchantable for saw logs now or prospec- 

 tively because of roughness, rot, or species (also see rotten 

 cull trees and rough trees). 



Desirable Trees. Growing-stock trees having no serious 

 defects in quality limiting present or prospective use, of 

 relatively high vigor, and containing no pathogens that 

 may result in death or serious deterioration before rotation 

 age. 



_ Diameter Classes. A classification of trees based on 

 diameter outside bark measured at breast height (4^2 feet 

 above the ground). D.b.h. is the common abbreviation for 

 "diameter at breast height." When using 2-inch diameter 

 classes the 6-inch class, for example, includes trees 5.0 

 through 6.9 inches d.b.h. inclusive. 



Disposable Personal Income. All monetary income 

 received during a specified period by individual persons 

 after payment of direct personal taxes. 



Dwelling Unit. One or more rooms occupied or intended 

 for occupancy as separate living quarters and having either 

 separate cooking equipment or a separate entrance. 



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 

 agricultural products totaled $250 or more during the 

 previous year. 



Forest Industry Lands. Lands owned by companies or 

 individuals operating wood-using plants. 



Lumber Producer. A forest owner who manufactures 

 lumber and uses a greater cubic volume of timber from 

 his land for this purpose than for any other primary wood 

 product that he may produce. 



Pulp and Paper Producer. A forest owner who manu- 

 factures wood pulp and who uses a greater cubic volume 

 of timber from his land for this purpose than for any other 

 primary wood product that he may produce. 



Other Wood Products Producer. A forest owner who 

 manufactures one or more wood products other than 

 lumber and/or pulp and who uses a greater cubic volume 

 of timber from his land for such products than for lumber 

 or pulp. 



Forest Land. Land at least 10 percent stocked by 

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

 cover and not currently developed for nonforest use. 

 (Also see Commercial Forest Land, Noncommercial 

 Forest Land, Productive-reserved Forest Land, and Un- 

 productive Forest Land). Includes chaparral areas in 

 the West and afforested areas. The minimum area for 

 classification of forest land is 1 acre. Roadside, stream- 

 side, 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, and clearings in 

 forest areas are classed as forest if less than 120 feet in 

 width. 



Forest Trees. Woody plants having a well-developed 

 stem and usually more than 12 feet in height, including 

 both growing stock and cull trees. 



Forest Types. A classification of forest land based 

 upon the tree species presently forming a plurality _ of 

 stocking. For pole-timber size trees and larger, stocking 

 is determined from basal area occurrence and for trees 

 less than 5.0 inches d.b.h. from numbers of trees. 

 Major Eastern Forest Type Groups: 



White-Red-Jack Pine. Forests in which eastern 

 white, red pine, or jack pine, singly or in combination, 

 comprise a plurality of the stocking. (Common asso- 

 ciates include hemlock, aspen, birch, and maple.) 



Spruce-Fir. Forests in which spruce or true firs, 

 singly or in combination, comprise a plurality of the 

 stocking. (Common associates include white cedar, 

 tamarack, maple, birch, and hemlock.) 



Longleaf-Slash Pine. Forests in which longleaf or 

 slash pine, singly or in combination, comprise a plurality 

 of the stocking. (Common associates include other 

 southern pines, oak, and gum.) 



Loblolly-Shortleaf Pine. Forests in which loblolly 

 pine, shortleaf pine, or other southern yellow pines 

 except longleaf or slash pine, singly or in combination, 

 comprise a plurality of the stocking. (Common asso- 

 ciates include oak, hickory, and gum.) 



Oak-Pine. Forests in which hardwoods (usually 

 upland oaks) comprise a plurality of the stocking but in 

 which southern pines comprise 25-50 percent of the 

 stocking. (Common associates include gum, hickory, 

 and yellow-poplar.) 



Oak-Hickory. Forests in which upland oaks, or 

 hickory, singly or in combination, comprise a plurality 

 of the stocking except where pines comprise 2&-50 

 percent, in which case the stand would be classified 

 oak-pine. (Common associates include yellow-poplar, 

 elm, maple, and black walnut.) 



223 



