COMPOSITE TYPE ON" THE APACHE NATIONAL FOEEST. 

 Table I. — Stand on sample acre of composite type — Continued. 



Diameter breast 

 high. 



Trees per acre. 



Yellow 

 pine. 



Douglas 

 fir. 



Spruce. 



White 

 fir. 



White 

 pine. 



All 

 species. 



Inches. 



29 



30 



.34 

 .26 

 .23 

 .20 

 .15 

 .11 

 .10 

 .07 

 .06 

 .04 

 .03 

 .02 

 12.69 



.26 

 .22 

 .20. 

 .22 

 .20 

 .16 

 .17 

 .15 

 .10 

 .13 

 .10 

 .08 

 8.93 



.01 

 .01 



.05 

 .04 

 .04 

 .03 

 .03 

 .03 

 .03 

 .02 

 .02 

 .02 

 .02 

 .01 

 1.36 



.05 

 .03 



.7 

 .6 

 .5 

 .4 

 .3 

 .3 

 .3 

 .2 

 .2 

 .2 

 .1 

 .1 

 27.5 



31 



32 



33... 











34 







35 







36 







37 .. 







38... 







39... 







40 







Above 12 inches.. 



Total 



Per cent of whole. 



2.69 



1.79 



26.26 

 38.1. 



21.65 

 31.4 



13.87 

 20.1 



2.26 

 3.2 



5.09 

 7.2 



69.0 

 100.0 



It will be seen from the table that up to a diameter of 12 inches 

 yellow pine, Douglas fir, and blue spruce are found in almost equal 

 proportion. However, above this diameter the number of spruce 

 per acre decreases rapidly, with practically none above 24 inches. 

 Although spruce does not normally attain the size of yellow pine and 

 Douglas fir, this bears out the opinion that the entrance of spruce 

 within the type has been comparatively recent. The relative num- 

 ber of yellow pine and Douglas fir per acre varies but little. At a 

 diameter of 4 inches, however, it is seen that Douglas fir predomi- 

 nates, a fact which would seem to indicate that the amount of Douglas 

 fir reproduction is increasing. White fir and white pine are not at 

 any time of first importance in the stand, though apparently the 

 latter is rapidly increasing in numbers, and may gain a foothold at the 

 expense of one of the more valuable species. 



In computing the volume per acre of western yellow pine, Douglas 

 fir, and blue spruce, volume tables constructed for these species 

 within the composite type were used. Since no tables were available 

 for white fir in this region, or for Mexican white pine, the table for 

 Douglas fir was used in computing the volumes of the former, and 

 the table for western yellow pine made by Woolsey on the Coconino 

 Forest for the latter. 



Table 2. — Average per acre on composite type. Board feet. 



Western yellow pine 6, 600 



Douglas fir 5, 450 



Colorado blue spruce 350 



White fir 850 



Mexican white pine 850 



Total average volume per acre, all species 14, 100 



While but 0.3 per cent of the estimated total area of the type was 

 actually measured, it is believed that the resulting figures are fairly 

 accurate, since the trees were calipered on measured areas, and in no 

 case was reliance put in ocular estimates. 



