THE USES OF VOLUME AND YIELD TABLES IN FOREST MANAGEMENT 61 



Hence (taking quality II as unity) the reduced area of a working, 

 circle is obtained by taking total area of 



I quality x 1'57 

 plus .... II x 1-0 



,,* J.J-jL jj O ( 



These factors are given as illustrations, they cannot be adopted 

 universally, since for example every rotation will have a different 

 set of factors or again where firewood and ballis below 8 inches 

 diameter come into consideration, it may be necessary to adopt the 

 M. A. I. figures for total wood production and not those for timber 

 production. 



An example oi the actual calculation is given in Chapter VI. 

 (4) The calculation oj the capital value of the estate. 



Such a calculation is required for the purpose of Chapter VII of 

 part I of working plans. The annual value of any working circle 

 may be taken as the value of M. A. I. x d where d = the average 

 density of stocking, provided this calculation makes adequate 

 allowance for hollow trees, and is checked with the financial 

 expectations as calculated in the plan. If both these calculation* 

 have been accurately made and are more or less in agreement 

 an additional check on the estimates will be available. Then the 

 capital value of the estate is the annual value capitalized at the 

 appropriate rate of interest. The uncertainty of data will however 

 often make this method of calculation impossible. 



(b) Use of the volume tables in calculating outturn of coupes. 



The custom in the forests of the United Provinces is to mark 

 trees to be felled in the annual coupes in one cold weather, and the 

 trees are felled in the following cold weather. Whether the trees 

 are sold standing to purchasers or worked departmentally, it is 

 important to arrive at the anticipated outturn of saleable material 

 as accurately as possible. In obtaining the estimate of outturn,. 



