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Revista de Ciências Agrárias
Print version ISSN 0871-018X
Abstract
VELASCO-MOLINA, M.; ALMEIDA, J.A.; VIDAL-TORRADO, P. and MACIAS, F.. Chemical fractionation of carbon on Acrisols with sombric horizon from South Brazil. Rev. de Ciências Agrárias [online]. 2010, vol.33, n.1, pp.277-286. ISSN 0871-018X.
Sombrics horizons (subsurface, dark and with a high content of C) have a genesis poorly understood and can be conceived as a potential sink of C in subtropical environments. The maximum accumulation of C bound to Fe and Al extracted by pyrophosphate and oxalate solution was observed in sombric horizons of two Acrisols of Santa Catarina State (S-Brazil), but this is not indicative of podzolisation, andosolisation or solodisation processes or accumulation of C due hydromorphy conditions. Most of its C was found at intermediate wet oxidisable fraction (oxidisable with K2Cr2O7, cold, but not by KMnO4). Recalcitrant C (nonoxidisable and difficult oxidisable) was an important pool (20-45%), but variable into profile. Changes on land use with different input of necromass and vegetations fire effects seem to be involved in its formation.
Keywords : Brazil; C fractions; C recalcitrant; oxidisable organic matter; sombric horizon.