FOEESTS OF KOCKY MOUNTAINS FOREST KESERVE 



TABLE 5. 



STIMULATED GROWTH OF SPRUCE. 



23 



In an area of pine type logged ten years ago, with both spruce and pine left, 

 the following data were obtained: 



TABLE 6. 



STIMULATED GROWTH OF SPRUCE AND PINE. 



The pine shows little increase over its growth previous to the logging, while 

 the spruce shows marked improvement, although its first fate was rapid, owing to 

 the comparatively large amount of light that it received in the pine stand, under 

 the light crown-cover of the latter. 



These percentages indicate increase in total volume in cubic feet. As the trees 

 are just reaching merchantable size the increase in board-foot contents is still more 

 rapid, and in the value of the material, greater yet. 



Method of Study. 



Although observations of this phenomenon frequently were made on individual 

 trees, for quantitative results, studies were made on plots one chain square so as 

 to obtain average results. These were located in stands lumbered approximately 

 twenty years ago. Each tree was chopped into far enough to show forty years' growth 

 and the width of each decade's growth measured. The location of the trees on the 

 plots was marked on a diagram to furnish a definite means of checking the influeuce 

 of the relative location in the stand of very fast or slow growing trees on their rate 

 of growth. The volume in cubic feet at the present and at the beginning of each 



