696 



TUMBEB RESOURCES FOR AMERICA'S FUTURE 



the data necessary for the calculations which were 

 then completed in the Washington Office of the 

 Forest Service following the procedures and tabu- 

 lar guides outlined in the criteria for the two 

 regions. Table 107 presents the factors applied 

 for determining felling-age effects. 



West Coast Supplementary Study 



For all of the area in Washington, Oregon, and 

 California sampled after March 12, 1954, data 

 supplementary to that required by standard pro- 

 cedures were recorded. These data weie as follows : 



1. Felling age of trees cut was recorded at each examina- 



tion point, regardless of stand age or type of cutting. 



2. At each observation point, information was recorded 



on forest type, site-qualit.y class, and whether clear 

 cutting or partial cutting had been applied. 



3. For points recorded as nonstocked, the reasons for lack 



of existing and prospective stocking were recorded. 



4. The tree species that stocked each examination point 



before cutting as well as the species that stocked the 

 point at time of examination were both recorded. 



These supplemental records were taken on about 

 95 percent of the forest area sampled in Washing- 

 ton and Oregon and on about 35 percent of the 

 area sampled in California. The results are pre- 



sented in the section "Productivity of Recently 

 Cut Lands," page 263, along with the results of 

 the standard study. 



STANDARDS FOR THE NORTHERN 

 ROCKY MOUNTAIN REGION 



Forest Type Groups 



The following forest type groups were recognized: 



Ponderosa pine Western white pine 



Western larch Inside blister rust control 



Douglas-tir units 



Fir-spruce Outside blister rust con- 



Lodgepole pine trol units 



Hardwoods 

 Aspen 



Species Classification 



The species classification, by type group and 

 locality, is shown in table 108. 



Existing Stocking 



Table 109 shows the standards used to deter- 

 mine existing stocking at each point. Seedlings, 



Table 107. — Percentage of mean annual growth at culmination attained at various ages, by forest type group ' 

 and size class of products cut, Pacific Northwest and California Regions 





Douglas-fir, hemlock-Sitka spruce, and west- 

 ern white pine (Pacific Northwest and 

 California) 2 



Ponderosa pine and western larch 

 (Pacific Northwest) 



Ponderosa pine 

 (California), 

 saw logs * 



Age (years) 



Saw logs ' 



Cord- 

 wood, 

 all sites 



Saw logs * 



Cord- 

 wood, 

 all sites 



East 

 side ' 



West 





Site I 5 



Site II 



Site III 



Site IV 

 and V 



Site 6 II 

 and III 



Site IV 



Site V 

 and VI 



side 8 



20 



Percent 



Percent 



Percent 



Percent 



Percent 

 18 

 50 

 78 

 92 

 99 



100 



Percent 



Percent 



Percent 



Percent 



Percent 



Percent 



30 



25 

 56 

 79 

 91 



97 

 100 



10 

 35 



64 

 82 



92 



98 



100 







10 

 28 

 47 

 64 



77 

 86 

 92 

 96 

 99 

 100 







25 

 57 

 80 

 93 



96 

 100 







40 



50 



60 



70 



80 



19 

 41 

 66 



82 



92 



98 



100 



26" 

 41 



60 

 75 



86 

 93 

 97 

 99 



100 



7 

 20 

 38 



54 



68 

 79 

 88 

 93 

 97 



99 

 100 



10 

 17 

 26 

 34 

 43 

 52 



62 

 71 

 80 

 86 

 92 

 100 



--- 

 52 



68 

 79 

 88 

 93 

 97 

 99 



100 



41 

 61 



76 



86 

 93 



90 



97 



100 





99 



110_.- _._ _ 







100 



120 











130 











140 















150 





















160 























170 























180 

























1 



















• Factors for felling age were not applied in the type 

 groups not shown here. 



2 For Douglas-fir in California, the factors for Site Index 

 III only were used. 



' International rule, J'^-inch kerf. 



* Scribner rule. 



5 Based on site classification in U. S. D. .A. Tech. Bui. 201 ■ 

 ^ Based on site classification in U. S. D. A. Tech. Bui. 630- 

 ' Standards where site index was 98 feet or less at 100 



years. 



* Standards where site index was greater than 98 feet at 



100 }-ears. 



