GROWTH TABLES FOR SELECTIVELY-CUT PONDEROSA PINE 



IN WESTERN MONTANA 

 by 



Arthur L. Roe 1/ 



INTRODUCTION 



A study of cut-over ponderosa pine stands in western Montana was made in 

 1947 in answer to forest managers' requests for ways to predict growth 

 of selectively-cut ponderosa pine timber. Growth responses to different 

 intensities of cutting were analyzed on 60 half-acre temporary sample 

 plots. Age of cutting varied from 5 to 50 years. 



From the data obtained, a set of yield tables has been developed for 

 predicting growth of residual trees after logging. The eight growth tables ^ 

 and methods for their use, are the subject of this report. They are pre- 

 sented on pages 6 to 13 . Two kinds of estimates can be made from these 

 tables : 



lo A general estimate of growth of residual stands on areas 

 containing typical, or average, conditions, to be used 

 principally for broad planning purposes, 



2, A more precise prediction of the growth of residual stands 

 vdiich includes adjustments for stand competition, site index, 

 and maturity^ 



HOW TO USE THE TABLES TO PREDICT BOARD-FOOT GROWTH 



IN CUT-OVER STANDS 



GENERAL ESTIMATES 



Growth may be estimated as an average figure which will be applicable to 

 average or typical residual stands. Tables 1, 2, and 3 show average 

 volume of residual trees by reserve stand classes up to 50 years after 

 cutting by five-year intervals and site classes. The volumes given are 

 net because mortality has been deducted. Table 1 represents growth 

 estimates for typical or average site class conditions on cut-over areas 



1/ Division of Forest Management Research, 



-1- 



