T o t a l i n v e n t o l i e s ancl nzethocls of volzime summa7.y zuhich facilitate conzpilation of t w e and log v o l u m e s t o a n y desi7.ed stancla?.d of utilization a?-e neeclecl. I t shoz~ld be possible t o filzd v o l u m e pel. t~e e t o a n y specified s t a n , d a~d o f zitilization exp).essecl a s stzcm p h e i g h t , to11 clib
ancl t o e s t i m a t e component zueights in biomass a n d o t h e~ stziclies. T h e fzinctions developed in t h i s pape.1. ancl based zipon clbh, total h e i g h t , ancl section h e i g h t a s a f~aaction of total h e i g h t c a n m e e t nzost o f t h e s e 7.eqzcir.e)nents.
Resume Les fonctions de defilement et leur application dans les inventaires forestiers
O n ct besoin cl'in.r;entcii).es fo?-estie?.s conzplets e t d e w~hthocles poztv facilitel-la co?npilation cle volzimes ligne7~n: cl'ar.b?~es e n t i e i s o u cle billes COT-~.esponclant ci cles niveazix d'zitilisation c l h t e~n~i n k s .
I1 clev?c~it i t~e possible d'kvalzie7~ le volzinze total pa). ~7.b7.e szsivant cles n i v e a u e cl'zitilisation e ep).imks e n t w m e cle hazitezt?. cle sozicke, cle cliam e t r e ?)zininzunz cl'zitilisation, e t / o u cle f action cle l a hazitezcv totale. D e plzcs, la techniqz~e ~l e v 7~a i t p o u v o i~* fozc?-ni7. la p7,opo7.tion clzt volzime total d e la tige conzp7'ise cla~zs les billes d e tozite longzcezt?~ o z~ clianzkt~e, qz~elqzse soit le s y s t & m e cle nzeszivage enzployk (pieel nzeszwe cle planche, pied czcbe 021 pozcls). L a me'thocle dem3ait azissi pozivoi7. &tm zitiliske pozu. clhc~i)*e l'inflzience cles facteznss biologiqzies s z t~ la f o l w e dzc fzit e t s o n clhfilenzent, e t p o z c~ estime?. les co.l?zposantes dzi poicls clans les ktzicles d e bionzasse e t azttres. L e s f o n c t i o n s cle clkf i l e m e n t p~~k s e n t h e s i c i sont baskes szoP le d h p , l a hazitelo. totale e t des f~~a c t i o n s cle lci haliteln3 totale. Elles pezivent ~~e n c o n t 7 -e ) . la plzipa).t cles e r igences knzsmk?*kes.Modern manufacturing methods, coupled with the multiplicity of possible end-uses of a single log in an integrated operation, require that the forester provide detai!ed information regarding the raw material supply. Data for the modern forest inventory must be collected in a manner that permits flexible and comprehensive analyses. Estimates of total volume per acre no longer suffice. Now the volume of material available in certain sizes and qualities must be estimated with high standards of precision and accuracy.A t the 1963 annual meeting of the Canadian In-
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