Vo Obtain total volume of the stand 35 years after logging by 

 summing the volume of residual trees and ingrowth » Computa- 

 tions follow; 



Volume of residual trees at end of 



35-year cutting cycle „ , « „ « . c „ , , » » 8875 bd, ft. 



Ingrowth 



Ponderosa pine o .,.<>., ..o, , 87 " " 



Douglas-fir ...... o ......... o 373 " " 



Total predicted volume of stand 10" dob<.h<, 

 and larger at end of 35-year cutting 



cycle .................... 9335 " " 



Periodic annual growth 

 3875 bd. ft. * 87 bd. ft. * 373 bdo ft, z 124 " " 



35 



LIMITATIONS ON USE OF TABLES 



Two limitations of which the user should be aware apply to prediction 

 of growth from these tables. One limitation pertains to species composi- 

 tion of stands. The stands studied contained^ on the average^ 77 percent 

 ponderosa pine and 23 percent Douglas-fir by basal area. Hence j these 

 tables should be used only for predicting growth of stands which are pre- 

 dominantly ponderosa pine. The other limitation applies to predicting 

 growth in stands which have been cut two or more times. Growth estimates 

 from the tables should not be applied directly unless growth in a cut-over 

 stand has dropped back to about the pre=logging rate. If a stand is still 

 benefiting from the stimulating effect of thinning caused by a previous 

 loggingj its initial growth rate at the time of the second cutting will 

 be higher than the initial rate given in the growth tables. Therefore, 

 the tables will generally underestimate growth after a second cutting. 

 By adjusting for the higher initial growth at the time of second or later 

 cuttings, the tables would be improved but the degree of improvement and 

 the reliability of estimates would be unknown « The growth values in tables 

 I5 2, 3s and 4 should not be extended in order to permit prediction of 

 growth in stands more heavily stocked than shown in the tables. It is 

 probable that growth in more heavily stocked stands is influenced by 

 stand density. 



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