. 2008. Stratifying soils into pedogenically similar categories for modeling forest soil organic carbon. Can. J. Soil Sci. 88: 501Á516. Most forest ecosystem carbon (C) models are designed to estimate total ecosystem C including soil C stocks and fluxes. Stratification by tree species is often used in these models to reduce uncertainty, but the potential of stratification by soil taxon has received little attention. This potential can be realized only if meaningful modeling strata are identified. Therefore, the objectives of this study were: (a) to distinguish strata of soil C modeling cateogories (SCMC) on the basis of soil C stocks of taxonomic categories that are characterized by similar pedogenic processes important to C dynamics, and (b) to review the literature to test the robustness of the SCMC scheme. Carbon stocks of 1383 forest soil pedons were analyzed by multiple means comparisons for soil orders and by orthogonal contrasts between pedologically related sets of subgroups within soil orders. Eleven SCMCs were distinguished with mean total C stocks varying from 325937.2 t ha Á1 for the gleyed Cryosol SCMC to 9493.9 t ha Á1 for the Brunisolic Gray Luvisol SCMC. A review of the literature relevant to each SCMC demonstrated that there is a scientific basis for using these strata to model forest soil C dynamics.Key words: Forest soil, carbon, modeling, pedology, genesis Shaw, C. H., Banfield, E. and Kurz, W. A. 2008. Stratification des sols en cate´gories a`pe´dogene`se similaire pour la mode´lisation du carbone dans les sols forestiers. Can. J. Soil Sci,. 88: 501Á516. La majorite´des mode`les du carbone (C) des e´cosyste`mes forestiers sont conc¸us pour estimer la totalite´du carbone dans l'e´cosyste`me, y compris ses re´serves et ses flux. Ils recourent souvent a`la stratification par espe`ce d'arbre afin d'atte´nuer les incertitudes, mais on s'est peu inte´resse´a`la possibilite´d'une stratification par taxon de sol. On ne pourrait ne´anmoins exploiter ce potentiel que si on identifie des strates utiles a`la mode´lisation. Les objectifs de l'e´tude consistaient donc (a) a`distinguer les strates de mode´lisation du carbone du sol d'apre`s la quantite´de C dans le sol des cate´gories se caracte´risant par les meˆmes me´canismes de pe´dogene`se importants a`la dynamique du C et (b) a`passer en revue les donne´es publie´es afin de ve´rifier la robustesse d'un tel syste`me. Les auteurs ont analyse´les stocks de carbone de 1 383 pe´dons de sol forestier par comparaisons multiples afin d'e´tablir l'ordre des sols et par contraste orthogonal entre jeux de sous-groupes a`pe´dologie voisine dans les ordres de sol. Ils ont ainsi obtenu onze strates de mode´lisation du C du sol, les re´serves totales variant en moyenne de 325 9 37,2 t de C par hectare pour la strate du cryosol gle´yifie´a`94 9 3,9 t de C par hectare pour la strate du luvisol gris brunisolique. Une revue de la documentation scientifique pour chaque strate prouve que l'application de ces dernie`res a`la mode´lisation de la dynamique du C dans les sol...
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