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UNITED STATES DEPARTMENT OF AGRICULTURE 

 FOREST SERVICE 



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No. 59 



Octob€ 



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DIAMETER GROWTH OF YOUNG PONDEROSA PINE TREES IN THE INLAND EMPIRB 



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Donald W. Lynch 

 Division of Forest Management Research 



Foresters often need a means of predicting diameter growth of trees for 

 such purposes as calculating ingrowth, planning thinning schedules, predicting 

 yields of specific products, and predicting quality growth. 



The three tables presented here are designed to predict future 10-year 

 diameter growth of young ponderosa pine trees. They are based on data gathered 

 in the Inland Empire and used in the preparation of cubic-foot growth tables.—'' 

 They were not published with the original report because their usefulness was 

 not fully realized at that time. These diameter growth tables are presented 

 here as a supplement to the earlier report, with the belief that they will fill 

 a need. The data are based on increment core measurements for the decade 1939- 

 1948 on about 5,000 trees, using an analytical procedure developed by Gevor- 



Increment core measurements showed that diameter growth by size and age 

 classes did not vary appreciably by site except over broad classes; this was 

 true for cubic-foot growth also. Accordingly, three tables are shown: table 

 1 for site class II and better; table 2 for site classes III, IV, and V; and 

 table 3 for site class VI and poorer. Stocking differences are "built into" 

 the tables by virtue of the age and diameter variables. 



1^/ Lynch, Donald W. 1954. Growth of young ponderosa pine stands in the 

 Inland Empire. U. S. Forest Service, Intermountain Forest and Range Expt . Sta. 

 Research Paper 36, 16 pp., illus. (Processed.) 



2/ Ge vorkiantz, S. R., and Lucille P. Olsen. 1948. An improved increment- 

 core method for predicting growth of forest stands. U. S. Forest Service, Lake 

 States Expt. Sta. Station Paper 12, 19 pp. (Processed.) 



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USE OF THE TABLES 



