VPPENDIX CRITERIA FOR RATING PRODUCTIVITY 



699 



Table 1 1 1 . — Percentage of mean annual growth at culmination attained at various ages, by forest type group 



and subregion, Northern Rocky Mountain Region 





Ponderosa pine 



, larch, and Doughis-fir 





Lodgepole pine 









South- 

















ern 













Age (years) 



Northern Idaho 

 and Montana 



Idaho 



and 



Wyo- 



Wyoming, east 



of Continental 



Divide 



Western 

 white 

 pine. 



Low elevations, 



western 



Montana and 



High elevations, 



northern Idaho 



and Montana 



Wyoming, east 



of Continental 



Divide 









ming 





saw- 



northern Idaho 













west of 





timber 















Divide 















Saw- 



Cord- 



Saw- 



Saw- 



Cord- 



Saw- 



Cord- 



Saw- 



Cord- 



Saw- 



Cord- 





timber 



wood 



timber 



timber 



wood 





timber 



wood 



timber 



wood timber 



wood 





Percent 



Percent 



Percent 



Percent 



Percent 



Percent 



Percent 



Percent 



Percent 



Percent Percent 



Percent 



40 





50 

 60 



4 

 15 





43 

 83 



20" 



10 

 30 



60 

 70 



20" 



50 

 60 



18 



48 



50 



10 



61 



60 



20 



70 



28 





95 



40 



50 



80 



40 



70 



40 



72 



70 



30 



80 



46 



15 



100 



60 



70 



90 



60 



80 



60 



81 



80 



40 



90 



60 



45 





70 



90 



100 



80 



90 



75 



88 



90 



50 



100 



73 



60 





80 



90 





80 



100 



85 



95 



100 .-- - 



60 

 70 

 80 

 90 

 90 

 100 





83 

 90 

 95 

 98 

 100 



72 

 83 

 90 

 95 

 97 

 98 

 100 





90 

 100 

 100 



100 





90 



90 



100 





92 



96 



99 



100 



100 



110 





120 









130 









140 

















150 



















160 ._- 

















































Hardwoods 



Aspen type 

 Elm-ash-cotton wood 



Cottonwood type 



STANDARDS FOR THE SOUTHERN 

 ROCKY MOUNTAIN REGION 



Forest Type Groups 



The following forest type groups and types were 

 recognized: 



Ponderosa pine 

 Douglas-fir 

 Lodgepole pine 

 Fir-spruce 



Standards for the cottonwood type were the same 

 as those described in the criteria for the Plains 

 Region, p. 687. 



Species Classification 



In the examination of points, species deshability 

 was determined according to the classification 

 shown in table 112. 



Existing Stocking 



Table 113 shows by forest type group and geo- 

 graphic location the standards used to determine 

 stocking at each point. Seedlings, saplings, and, 

 in some instances, poles were counted if they fell 

 within 1-, 2-, or 4-milacre plots as indicated in the 

 table. Larger trees were counted if they were 

 located within the maximum distance from the 

 ^joint indicated for each d. b. h. class. The fol- 

 lowing tabulation relates the entries m table 113 



439296 0—58 46 



for seedlings, poles, and saplings to conventional 

 measures by the stocked-quadrat method: 



Entries from table US 



Equivalent minimum of trees per 

 quadrat required for a stocked 

 point (number) 



1 per 1-milacre quadrat 



2 per 2-milacre quadrat 

 1 per 2-milacre quadrat 

 1 per 4-milacre quadrat 



Minimum trees per acre Maximum 

 (number) distance 



from point 

 (feet) 



1,000 3.7 



1,000 5.3 



500 5.3 



250 7.4 



Prospective Stocking 



The procedure followed in determining the pros- 

 pects of futm'e stocking at unstocked points in 

 the Southern Rocky Mountain Region was similar 

 to that for the Northern Rocky Mountain Region. 

 The standards used for prospective stocking, based 

 on proximity to seed source, were as follows: 



Maximum 



Type group: S""/ 



Ponderosa pine — Nevada, Utah, southwest from point 



Colorado, and east slope of Rockies: (/«<) 



12 to 16 inches d. b. h 40 



18 to 24 inches d. b. h 50 



26 inches d. b. h. and larger 70 



Arizona and New Mexico: 



18 inches d. b. h. and larger 50 



Douglas-fir: 



10 to 14 inches d. b. h 50 



16 inches d. b. h. and larger 60 



Hardwoods — aspen type ' 30 



' This distance refers to the stump of a recently cut tree. 

 Major reliance for reproduction in aspen is placed on root 

 suckers, not seed. 



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