WESTERN" YELLOW PINE IN" OREGON. 



21 



Table 7. — Number of trees per acre by diameter classes of yellow pine and of other species 

 in several representative stands in central and eastern Oregon — Continued. 



Diameter at breastheight. 



Near Embody, 

 Lake County. 

 Basis: 30 acres. 



Near 

 Lapine, 



Crook 

 County. 



Basis: 

 40 acres. 



lOamath Lake 



Region, 



Klamath County. 



Basis: 159 acres. 





Yellow 

 pine. 



Others. 



Yellow 

 pine. 



Yellow 

 pine. 



Others. 



Inches. 

 2 



14.11 



9.41 



4.71 



4.73 



4.33 



3.27 



3.83 



3.67 



3.30 



2.83 



2.80 



2.23 



2.20 



1.70 



1.47 



1.33 



1.30 



.80 



.37 



.20 



.30 



.40 



0.08 

 .07 

 .05 

 .13 

 .17 

 .06 

 .06 



0.75 



.50 



.25 



.32 



.22 



.25 



.35 



.25 



,42 



.65 



1.00 



1.10 



1.15 



1.22 



1.40 



1.32 



.67 



.80 



.60 



.42 



6.71 



5.23 



2.72 



2.09 



1.94 



1.79 



1.84 



1.99 



2.09 



2.35 



1.96 



2.27 



1.99 



2.46 



1.74 



1.35 



1.10 



.72 



.59 



.38 



.30 



.45 



8.52 



4 



5.29 



e; 



, 6.28 



s 



2.46 



10 



1.29 



12 . 



1.35 



14 



1.06 



16 



1.21 



IS 



.06 



.67 



20 



1.14 



22 





.45 



24 



.03 



.72 



26 



.62 



28 





.48 



30 . 





.45 



32 





.44 



34 





.36 



36 





.24 



38 





.16 



40 





.15 



42 





.08 



Over 43 





.27 



.26 









T otal 



69.29 

 32.00 



.71 

 .21 



13.91 

 11.87 



44.06 

 25.37 



32.68 



Total over 12 inches 



9.84 







VOLUME PER ACRE. 



Yellow-pine forests are so irregular in density that figures for the 

 average stand per acre or per quarter section are apt to be mis- 

 leading. Though the volume of timber may be very high on an area 

 of an acre or so, there are usually openings in the forest, groups of 

 young growth, glades, or barren spots, which reduce the average per 

 acre volume of any large tract. Single sample acres frequently have 

 a stand of 50,000 feet b. m. both in the Blue Mountain region and 

 on the Cascades, but it is considered to be a good quarter section 

 that has 4,000,000 feet b. m. or 25,000 feet to the acre. The following 

 estimates of the amount of merchantable timber on two small water- 

 sheds, in different parts of the State, are representative of the regions 

 which they typify, and illustrate the average density and composition 

 of species on large tracts such as are now being logged. Estimate A 

 is for a watershed at the head of one branch of the John Day River 

 in the Blue Mountains, and Estimate B is for a watershed on the 

 eastern slopes of the Cascades in Klamath County. 



Estimate A. 



Total area of waterahed acres. . 11, 777 



Area covered by merchanta?jle timber ' do 6, 297 



Average stand per acre, of all species, on area of merchantable timber., feet b.m. , 13, 672 

 Total stand composed of — 



Western yellow pine per cent. . 84 



Western larch do 9 



Douglas fir, wldte fir, and lodgepole pine do 7 



1 The balance of the watershed Is meadow, barren "scabby" ridges, patches of young timber, and 

 noncommercial stand.s of IclKepolo pine. 



