A GENERALIZED YIELD TAP.LE 



385 



sites established by Frothingham ^ in his age-height site class curves 

 for southern upland hardwoods, which in turn are tied up to the sug- 

 gested standard 100-year height site classes, "C" series, given on page 

 — of this article, commencing with site I la for stands with dominant 

 heights of 30 to -"iO feet at 100 years, and ranging up to site Vila for 

 heights of 130 to 150 feet. 



TOTAL CUBIC FEEIT PER ACRE. 



fel s ^ ^ ^ ^ 



The table is a generalized yield table based on plots representing a 

 wide variety ot types and is a distinct departure from the ordinary 

 conception of a normal yield table as one made for a single species 

 or type. 



The striking thing brought out by the study is that the total cubic 

 yield of well-stocked stands varies fairly uniformly with the average 

 height of dominant trees in the stand, regardless of differences in type 

 and prevailing species. This is shown by a tabulation of the number 

 of plots by types and the per cent of selected plots in each type, that 

 is, plots which fell in the same site class in volume as in height- 

 according to the age-height site class curves. 



= For discussion and basis for these curves see article and diagram on "Site 

 Determination ... in the Southern Apalachians," Journ.xl of FoRrsTRY, 

 January, 1921. 



