SAMPLE PLOTS IX SILVICULTURAL RESEARCH 



19 



Although the discussion in this section applies primarily to per- 

 manent plots, the repeated measurements or examination of semi- 

 permanent and temporary plots and of strip-cruise lines are often 

 so valuable that all such plots and lines should always be 

 marked with durable posts or in some other permanent way. 

 Bark blazes made with a hatchet or bark scratcher along the 

 boundaries of temporary plots as a means of exact relocation require 



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Figure 1. — Construction of concrete post : A, top view ; B, elevation ; C, completed post. 



little extra time and last for many years. At least one corner, or 

 the center, of each temporary plot should be permanently marked, 

 and at least the starting and ending points of strip -cruise lines. 



SURVEY OF SUBPLOTS 



Subplots (or quadrats) should be surveyed at least as accurately 

 as plots. They should never be laid out with a compass. A rigid 

 frame should be used to lay them out, or their diagonals should be 

 checked. 



