Figure 3. — Relationship of reserve 

 stand volume to the total 



number of seeds dispersed per 

 acre. The trees ranged from 

 12 to 27 inches d.b.h. and 

 averaged 19 inches d.b.h. 



50l ± i i i i 



3,000 5,000 7,000 



STAND VOLUME (Bd. ft. per acre) 



Seedfall was influenced by the climatic conditions prevailing during the time 

 cones matured and seeds were shed. For example, in 1951, 90 percent of the sound pine 

 seed was dispersed by October 1. This was due to the near normal rainfall and tempera- 

 ture that prevailed during August 1951. However, in 1954 only 70 percent of the 

 sound seed was shed by October 1 because summer rainfall was heavy and temperatures 

 remained well below average. Conversely, seedfall began earlier in 1949 because of 

 dry, warm conditions. 



Stand Volume 



Seed production of ponderosa pine at Bluesky was directly related to residual 

 volume in 1948, a good seed year (fig. 3). This relationship was not consistent 

 in years of lower seed production and varied between areas from year to year. These 

 differences may have been caused by unequal cone losses before seed dispersal or the 

 sample may simply have been too small to detect any trend. 



9 



