316 APPENDIX 



increment = the increment for a specific year (abbreviation, c. a. i.) 

 (G., laufend jahrlicher Zuwachs); periodic increment = the increment 

 during a specific period of years; mean annual increment (m. a. i.) = the 

 total increment divided by the age (G., Gesammtalterszuwachs) ; pe- 

 riodic annual increment (p. a. i.) = the increment for a specified period 

 of years divided by the number of years in the period; usually used 

 in lieu of the current increment (G., periodischer Durchschnittszu- 

 wachs). 



Quality increment is the increase in value per unit of volume due to its 

 augmented intrinsic worth with size or age. 



G., Qualitatszuwachs. 



Price increment is the increment in the sale value of forest products 

 independent of quality increment, due to market conditions. 



G., Teuerungszuwachs. 



Value increment is the increase in value of a tree or stand due to com- 

 bined volume, quality and price increment. 



G., Wertszuwachs. 



Increment may be expressed in absolute numbers or as increment per 

 cent per annum based on present or on past quantity as 100. 



See also Index per cent. 



Increment borer. An instrument for determining the rate of growth in 

 diameter of standing trees. It consists of a hollow auger, which, when 

 bored into a tree at right angles, extracts a core on which the annual 

 rings show. 



Syn.: accretion borer; Pressler borer. 



G., Zuwachsbohrer. F., sonde de Pressler. 



Index per cent. The increase in value of a tree or of a stand, due to the 

 combined volume, quality and price increments, expressed as an annual 

 per cent of its present value. The interest rate at which a given stand 

 pays interest by its value increment on its current value plus Base 

 capital (q. v.) as capital; used to determine financial maturity or felling 

 age by comparison with a demanded business rate. 



G., Weiserprozent ; Forstprozent. F., taux maximum du revenu. 

 Index stand. A mature stand used as a basis for conclusions, or an 

 index of condition (volume) of the stand in former years, or of other 

 immature stands, on the supposition that the stems of the mature 

 stand represent the dominant stand of the earlier periods on the same 

 site. 



