FOREST TERMINOLOGY 83 



G., Zuwachs. F., accroissement. 



Increment is differentiated with reference to time as current annual 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) ; periodic 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 Durchschnittszuwachs). 



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 incremert is the increase in value of a tree or stand due to combined 

 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 incre- 

 ment on its current value plus Base capital (g. 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 supposi- 

 tion that the stems of the mature stand represent the dominant stand of the earlier 

 periods on the same site. 



G., Weiserbestand. F., peuplement type. 

 Index tree. A mature tree utilized as an index of condition of immature trees. 



See Index stand. 

 Interlucation. New term. A severe opening up of a stand to hght beyond the 

 degree of severe thinning in order to secure a large increase of diameter on the 

 remaining stand before final harvest. Usually accompanied by underplanting 

 See Intermediate cuttings. 

 Intermediate. See Crown class. 



Intermediate. Refers to operations or occurrences taking place during the rota- 

 tion before the final harvest of a stand, such as Intermediate cuttings or felHngs 

 (g. v.), Intermediate yield or Income or Returns. 

 Intermediate cuttings or fellings. Cuttings made in a stand between the time of 

 its formation and its final harvest. It includes cleanings, improvement cuttings 

 and thinnings. 



