630 



TIMBER RESOURCES FOR AjMERICA'S FUTURE 



Fire protection status. A classification of com- 

 mercial and noncommercial forest lands requiring 

 protection from fire, according to the degree of 

 protection given them. 

 Protected. 



Class 1. Protection adequate to meet the 

 fire situation in worst years and under serious 

 peak loads. 



Class 2. Protection adequate to meet the 

 average fire situation but failures likely in 

 worst years and under peak loads. 



Class 3. Protection adequate to meet the 

 fire situation in easy years but failures fre- 

 quent in average or worse years. 

 Unprotected. No protection given. 

 Forest industries. See Ownership. 

 Forest land area. Includes (a) lands which are 

 at least 10-percent stocked by trees of any size 

 and capable 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 stocking and which have not been 

 developed for other use; (c) afforested areas; and 

 (d) chaparral areas. Does not include orchard 

 land. The minimum area that qualifies as forest 

 land is 1 acre in the East and 10 acres in the West. 

 Roadside, streamside, and shelterbelt strips of 

 timber, in addition to meeting the above require- 

 ments, must be at least 120 feet wide to qualify as 

 forest land. 



Commercial forest land area. Forest land 

 which is (a) producing, or physically capable of 

 producing, usable crops of wood, usually saw- 

 timber, (b) economically available now or pros- 

 pectively, and (c) not withdrawn from timber 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 (a) withdrawn from timber utilization through 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 

 which otherwise qualifies as commercial forest 

 land, or (b) incapable of yielding usable wood 

 products, usually sawtimber, because of adverse 

 site, or so physically inaccessible as to be un- 

 available economically in the foreseeable future. 

 Reserved forest land area. Productive or 

 unproductive public forest land set aside by 

 statute, ordinance, or administrative order for 

 parks, monuments, wilderness areas, and 

 other special uses. 



Unproductive forest land area. Forest land 

 incapable of yielding usaV)le wood products, 

 usually sawtimber, because of adverse site, or 

 so physically inaccessible as to be unavailable 

 economically in the foreseeable future. In- 

 cludes chaparral land in the West. Unpro- 

 ductive forest land area includes lands that 

 - are productive in grazing, watershed, recrea- 

 tional, and wildlife uses. 

 Forest type groups. A classification of forest 

 areas based upon tlie predominant species composi- 



tion of the present tree cover. The major forest 

 type groups used in this Review consist of groups 

 of local forest cover types. The forest type group 

 names indicate the predominant species except 

 in the redwood and western white pine type 

 groups. Predominance is measured in terms of 

 cubic volume in sawtimber and poletimber stands 

 and number of trees in seedling and sapling stands. 

 When none of the indicated species comprise 50 

 percent or more (20 percent or more in the redwood 

 and western white pine type groiips), the stand is 

 typed on the basis of plurality of cubic volume or 

 number of trees. The major forest type groups 

 found on commercial forest land and reserved non- 

 commercial forest land are listed below. 

 Major western forest type groups. 



Douglas-fir. Forests in which 50 percent 

 or more of the stand is Douglas-fir, except 

 where redwood, sugar pine, or western white 

 pine comprises 20 percent or more, in which 

 case the stand would be classified as redwood 

 or white pine type group. 



Hemlock-sitka spruce. Forests in which 

 50 percent or more of the stand is western 

 hemlock, Sitka spruce, or both. 



Redwood. Forests in which 20 percent or 

 more of the stand is redwood. 



Ponderosa pine. Forests in which 50 per- 

 cent or more of the stand is ponderosa pine, 

 Jeffrey pine, sugar pine, limber pine, Arizona 

 pine, Apache pine, or Chihuahua pine, singly 

 or in combination except where western white 

 pine or sugar pine comprises 20 percent or 

 more, in which case the stand would be classi- 

 fied as wliite pine type group. 



Western white pine. Forests in which 20 

 percent or more of the stand is western white 

 pine or sugar pine. 



Lodgepole pine. Forests in which 50 per- 

 cent or more of the stand is lodgepole pine. 



Larch. Forests in which 50 percent or 

 more of the stand is larch except wliere west- 

 ern white pine comprises 20 percent or more, 

 in which case the stand would be classified as 

 white pine. 



Fir-spruce. Forests in which 50 percent 

 or more of tlie stand is true fir {Abies spp.), 

 Engelmann spruce, Colorado blue spruce, or 

 mountain hemlock, singly or in combination, 

 except where western white pine comprises 20 

 percent or more, in which case the stand would 

 be classified as white pine. 



Pinyon pine-juniper. Forests in which 50 

 percent or more of the stand is pinyon pine, 

 Digger pine. Coulter pine, juniper, or cypress, 

 singly or in combination. 



Hardwoods. Forests in which 50 percent 

 or more of the stand is hardwood species, 

 except where western white pine, sugar pine, 

 or redwood comprises 20 peicent or more, in 



