An Example 



A forester can easily use Tables 4 through 10 in estimating present 

 stand volumes and in predicting growth and mortality. Solutions can 

 also be obtained from the equations, but table values are adequate for 

 most practical purposes. Tables 7, 8, and 9 give growth estimates only 

 for age 50 years; for the equations on which these tables are based, 

 however, age has a small effect on growth estimates. 



Table 3 can be used to predict site index from soil drainage classi- 

 fication. If mean dominant-codominant tree height has been estimated, 

 Figure 5 can be used to estimate site index. 



Assume a forester collected the following inventory data: 



(1) basal area per acre (trees 3.0 inches and larger) = 180 SQuare feet 



(2) mean height of dominant-codominant trees = 60 feet 



(3) mean breast-height age of dominant-codominant stand = 40 years 



(4) mean Girard form class = 80 



(5) trees per acre (3.0 inches and larger) = 400 



(6) percent pine sawtimber = 60 percent 



From Figure 5, site index ^ 70 feet. 



Based on these data the following estimates are made: 



Table Type of Estimate Per Acre Value 



4 Cubic foot volume 5,270 



5 Board foot volume 23,782 



6 Gross annual cubic foot volume growth 164 



7 Net annual ciibic foot volume growth 123 



8 Gross annual board foot growth 1,062 



9 Net annual board foot growth 1,011 

 10 Annual tree mortality 7 



Tables 7, 8 and 9 give growth rates for stands that are at a breast- 

 height age of 50 years. From the equations the growth rates at 40 

 years are: 



Net annual cubic foot volume growth 126 



Gross annual board foot volume growth 1,093 



Net annual board foot volume growth 1,032 



Considering the errors involved in predicting growth, the differ- 

 ences in predicting growth at 40 and 50 years is of little practical im- 

 portance. 



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