28 WESTERN YELLOW PINE IN ARIZONA AND NEW MEXICO. 
TABLE 15.—Mazrimum stand on 2-acre sample plot, Tusayan Forest. (Trees per i ) 


acre.) 
Estimated number of 16-foot logs to 
: ~ trees. 
Diameter 
breast high. 
Py 2 3 4 5 Total 
Inches 
IG=N82 ees se OG) *|Keabesse OS5I leeeeere 1.0 
NOU eed 5 0.5 TO) eee es 2.0 
DWN Sone cues 5 ileye 2.0 1 & 5.0 
DED eee ae eye | ea rc ra Bh Ono 9.0 
2830 beh: arn eos ie ees 5 1.0 10.5 12. 0° 
BI E88 See sal Serene es | eee ee 1.0 Dd, 5) 3.5 
BASS Gee = ere nbs | es |e ae al Ee nee 11,53 16 
BLO OS es HN Pete eee pat tee || eee a ato 5 63) 
OvierslSeenees 1.0 2.5 9. 0 22.0 34.5 


FULLY STOCKED STANDS. 
The open and grouplike character of even the heaviest existing 
stands of western yellow pine in the southwest prevents the figures 
for maximum stands from being a 
fair measure of what an area is 
capable of producing if fully 
stocked; that is, when the trees 
are evenly distributed over it at 
distances apart conducive to their 
best growth. Here and there, how- 
ever, are small areas that may be 
considered fully stocked, though 
these are seldom over 1 or 2 acres 
in extent. An example of a fully 
stocked stand was noted on the 
Zuni Forest, where on an area of 
24 feet by 78 feet, comprising one 
twenty-third of an acre, were 8 
splendid veterans, averaging over 
Fic. 5.—Distribution of blackjack on 100 feet in height, and from 23 to 
oe eee 35 inches in diameter breast high. 
If this same density were maintained it would give a stand of about 
184 veterans per acre. Two sample plots on the Datil National 
Forest, figures for which are given in Table 16, illustrate the grouplike 
character of even a fully stocked stand when grown under natural 
conditions. Figure 5 shows graphically the location of the trees on 
one plot. Through almost all stages of growth the openings remain 



approximately the same size until gradually the parent stand dies | 
out, the small blanks become stocked with seedlings, and the cycle 1s 
complete. 
The figures given in Table 16 for two fully naturally stocked stands 
of blackjack are an indication of the maximum stand capacity for soil 

