220 THE THEORY AND PRACTICE OF WORKING PLANS 



(5) The \-olume of those stands which are to be cut in the 

 next two decades. 



(6) The mean annual increment prorated to the end of the 

 rotation. 



The data on volume and increment of the younger stands is 

 taken from yield tables; in stands approaching maturity exact 

 measurements in the field are required. Stands of varying 

 density and all under 5 acres in size are to be calipered com- 

 pletely. In very irregular stands (e.g., mixed species, un- 

 even-aged, etc.), sample plots are measured to cover from 5 to 10 

 per cent of the total area. The volume is calculated from the 

 calipered diameters by measuring average trees,' so chosen 

 that in height and diameter they represent the stand in minia- 

 ture. 



These data are combined in a tabular forest description 

 which takes the following form (general stand table) : 



Column I. LocaUty. 



2. Compartment — number. 



3. Subcompartment — letter. 



4. Soil and slope. 



5. Species, per cent of mixture and general form of 



stand. 



6. Age of stand — years. 



7. Average height of stand — metres. 



8. Total basal area — square metres. 



9. Site quality. 



10. Density of stand in decimals of i.o. 



11. Area in hectares. 



12. 1 ,, , . , , f per hectare. 

 \ V olume m cubic metres 1 , ^ , . 



13. J [ lor total area. 



14. 1 j\Iean annual increment prorated | per hectare 



15. J to rotation age, in cubic metres [ for total area. 



16. Volume increment per cent. 



17. Quality increment per cent. 



18. Index per cent. 



19. Remarks. 



