•m- 



Appendix 



-«^ 



Definition of Terms 

 Forest Area 



Forest-land area. — Includes (a) lands that are at 

 least 10 percent stocked by trees of any size and ca- 

 pable of producing timber or other wood products, or 

 of exerting an influence on the climate or on the water 

 regime; {b) land from which the trees described in 

 {a) have been removed to less than 10-percent stock- 

 ing and that has not been developed for other use ; and 

 (c) afforested areas. (Forest tracts of less than 1 acre 

 and isolated strips of timber less than 120 feet wide 

 are excluded.) 



Commercial forest-land area. — Forest land that 

 is (a) producing, or physically capable of producing, 

 usable crops of wood (usually sawtimber), (b) eco- 

 nomically available now or prospectively, and (c) not 

 withdrawn from timber utilization. 



Noncommercial forest-land area.- — Forest land 

 (a) withdrawn from timber utilization through statute, 

 ordinance, or administrative order, but that otherwise 

 qualifies as commercial forest land, or (b) incapable 

 of yielding usable wood products (usually sawtimber) 

 because of adverse site conditions, or so physically in- 

 accessible as to be unavailable economically in the 

 foreseeable future. 



Forest Types 



Forest types are defined according to the species, or 

 species group, that makes up the major part of the 

 stand in terms of board-feet in sawtimber stands or 

 number of stems in other stands. 



White pine type group. — The principal types in- 

 cluded are white pine (white pine making up 75 per- 

 cent or more of the stand) , hemlock (hemlock pure or 



predominant over any single associate), and white 

 pine-hardwood (white pine making up 50 to 74 per- 

 cent of the stand) . Stands in which pitch pine makes 

 up 75 percent or more of the stand also are included 

 in this type group. 



In table 17, these four types are grouped as the 

 white-red-jack pine forest type, which is defined as 

 follows: Forests in which 50 percent or more of the 

 stand is eastern white pine, or jack pine, singly or in 

 combination. (Common associates include hemlock, 

 aspen, birch, and maple.) 



Spruce-fir type group. — Spruce and balsam fir 

 make up 75 percent of the spruce-fir stands and 50 to 

 74 percent of the spruce-fir-hardwood stands. The 

 cedar-tamarack-spruce type is also included in this 

 group. 



In table 17, these three types are grouped as the 

 spruce-fir forest type: Forests in which 50 percent or 

 more of the stand is spruce or true firs, singly or in 

 combination. (Common associates include white- 

 cedar, tamarack, birch, and hemlock.) 



Aspen-paper birch type group. — Pure stands of 

 aspen, gray birch, or paper birch, or stands in which 

 these species predominate. 



In table 17, the two types in this group comprise the 

 aspen-birch forest type: Forests in which 50 percent or 

 more of the stand is aspen, balsam poplar, paper birch 

 or gray birch, singly or in combination. ( Common as- 

 sociates include maple and balsam fir.) 



Hardwood type group. — The northern hardwood 

 type, largely yellow birch, sugar maple, and beech, is 

 the principal type in this large group. Next in im- 

 portance is the hardwood-spruce-fir type, in which 

 spruce and fir make up 20 to 49 percent of the stand 

 in mixture with hardwoods. The hardwood-white 

 pine, ash-maple-elm, and oak types also are included. 



Forest Resources of New Hampshire 



29 



