6o Compute ingrowth from tables 6^ 7 5 and 8 and the stand table 

 prepared in step 5o Tables 65 7^ and 8 show the board- foot 

 volume of pole size trees by five-year intervals after 

 logging o In our problem, both ponderosa pine in site class V 

 and Douglas-fir are present. Therefore, values for the solution 

 are taken from table 7 for ponderosa pine and from table 8 for 

 Douglas-fir„ Values, read from the proper diameter class and 

 five-year interval in the table, should be multiplied by the 

 number of trees in the corresponding diameter class in the 

 stand table „ Thus, in the example there is Oo37 ponderosa 

 pine tree per acre in the 7-inch d„boh„ class, A volume of 41 

 board feet is shown in table 7 for the volume of a 7-inch tree 

 35 years after logging. This volume multiplied by the number 

 of trees per acre in the stand table will then give the volume 

 per acre (41 X ,37 - 15=17 bd, ft,), A tabulation like the 

 following will be the result vAien volumes for the other diam- 

 eter classes have been computed. 



DoBoKo 



I Ingrowth volume summary per acre 



Class 

 (Inches) 



Ponderosa pine ° 



Douglas-fir 





Bdo ft. 



Bdo ft. 



3 







4 







5 



3/ OoOO 



4/ 85.25 



6 





84 063 



7 



4/ 15ol7 



85,50 



8 





67.84 



9 



71o76 



49o80 



Total 



86,93 



373 02 



3/ By referring to table 7^, it will be seen that a five- inch ponder- 



osa pine 'does not attain merchantable size in 35 years, 

 4/ Number of trees per acre times volume per tree. 



The products derived are net values because average mortality has 

 been deducted from pole volumes in the tables. 



-4' 



