Height 



Tree heights of several dominants and codominants on each plot are shown through 

 time in figures 4, 5, and 6. Each dot represents a measurement of a cross-sectional 

 disk. The dots are connected by straight lines for simplicity. Few of these curves 

 approximate the conventional S-curve, in which height growth increases initially and 

 then tends to decrease as the tree matures. Most of the trees have had fairly constant 

 height growth rates throughout their lives with a tendency for slightly lower initial 

 growth rate. None appear to be approaching culmination of height growth. Tree #27 at 

 Green Creek (fig. 4) and tree #32 on the Cattle Trough plot (fig. 5) come the closest 

 to the conventional S-curve but #27 is still a young tree and the height growth rate of 

 #32 does not appear to have decreased in the past 70 years. 



10 i ■ . , 



Year 



Figure 4. — Heights of five dominant and oodominant pinyons on the Green Creek plot from 

 1780 to 1977. Tree §6 is not shown because its curve coincides with those of trees 

 §21 and §27. 



3 



