700 



TIMBER RESOURCES FOR AMERICA'S FUTURE 



Maximum 



distance 



from point to 



timber edges 



in multiples 



Type group: of tree height 



Douglas-fir 2 



Lodgepole pine (') 



Fir-spruce ^3 



1 Individual seed trees not considered as seed sources 

 because of lack of windfirmness after cutting. The seed 

 source was considered adequate only if cone-bearing slash 

 less than 5 years old was present on the ground at the 

 point or if a timber margin of cone-bearing trees was located 

 within 2 chains of the point. 



2 Individual seed trees considered adequate seed sources 

 only in occasional instances where windfirm after cutting. 

 In Colorado where partial cutting removed less than 50 

 percent of the volume, seed sources were considered ade- 

 quate. Maximum distance of 12-inch d. b. h. and larger 

 seed trees from point in multiples of tree height, 1. Ad- 

 jacent bodies of timber were considered adequate seed 

 sources only when at least 60 years of age and judged to 

 be windfirm. 



The seedbed was considered adequate onl}' 

 where the 4-milacre plot surrounding a sample 

 point was not more than 50 percent occupied by 

 brush, grass, sod, weeds, rock, water, road surface, 

 and other limiting cover. In Colorado, Arizona, 

 and New Mexico it was further required that the 



plot be affected by logging through removal of 

 trees, shrubs, and other vegetative competition or 

 by scarification in order to qualify as an adequate 

 seedbed. 



In Utah and Nevada the examiner was especially 

 instructed to observe site factors, inherent or 

 introduced, which adversely affected the estab- 

 lishment of seedlings. Some of the factors to be 

 considered were degree of slope, exposure, soil 

 characteristics, browsing and/or trampling by 

 grazing animals, and rodent damage. The deci- 

 sion with respect to the prospective stocking 

 rating was based on the experience and judgment 

 of the field examiner. 



Effect of Felling Age 



The factors shown in table 114 were used to 

 determine the effect of felling age. Ordy a limited 

 amount of cutting in second-growth stands occurs 

 in the Southern Rocky Mountain Region. There- 

 fore, table 114 presents data only for those type 

 groups and localities where such cutting was 

 expected to be encountered during field examina- 

 tion. 



Table 112. — Classification of species accordi 



ng to forest type group,^ Southern Rocky Mounta 



ill Region 







Ponderosa pine 



Douglas- 

 fir 

 (Utah and 

 Nevada) 



Fir-spruce 2 



Lodgepole pine 





Species 



Arizona 

 and New 

 Mexico 3 



South- 

 western 

 Colorado 

 and east 

 slope of 



Rocky 

 Mountains 



Western 

 Nevada 



Utah and 

 Nevada 

 (south) 



Colorado * 



Arizona 

 and New 

 Mexico ' 



Colorado < 



Utah and 

 Nevada 



Elm-ash- 



cotton- 



wood 



(Colorado) 























D 





D 



A 

 A 



A 



A 



A 



A 



D 



5 A 

 A 





D 



A 

 A 





D 

 A 

 A 







A 



A 





Fir grand 





A 



5 A 



SA 



« A 



A 



A 



D 



D 



D 



A 





Fir, red - - 













Fir white 







A 



5A 





























Larch 









D 

 A 

 D 









D 

 D 

 D 









A 

 D 



A 

 D 



V 





D 





Pinp pnndprnsa 



D 

















Pinp sitigftr 









































Spruce blue 



A 

 A 



A 



A 





5A 



D 





A 

 D 











A 



A 



D 



D 



D 









D= Desirable species. 

 A=Acceptable species. 

 ' Aspen type: All species classed desirable. 



' In Utah and Nevada: All species classed desirable if marketable locally 

 except limber and whitebark pine, which are noncount species. 



' All pines except pinyon were classified desirable for the type. 

 * AH conifers not listed for the type were considered desirable. 

 ' Classified acceptable only if marketable under local conditions; otherwise, 

 as noncount. 



