SciELO - Scientific Electronic Library Online

 
vol.33 número1Compostagem da fracção sólida do chorume com palha de azevém (Lolium multiflorum Lam.) ou tojo (Ulex europaeus L.)Previsão da qualidade do solo em áreas regadas com águas salinas índice de autoresíndice de assuntospesquisa de artigos
Home Pagelista alfabética de periódicos  

Serviços Personalizados

Journal

Artigo

Indicadores

Links relacionados

  • Não possue artigos similaresSimilares em SciELO

Compartilhar


Revista de Ciências Agrárias

versão impressa ISSN 0871-018X

Resumo

VELASCO-MOLINA, M.; ALMEIDA, J.A.; VIDAL-TORRADO, P.  e  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.

Palavras-chave : Brazil; C fractions; C recalci­trant; oxidisable organic matter; sombric ho­rizon.

        · resumo em Espanhol     · texto em Espanhol     · Espanhol ( pdf )

 

Creative Commons License Todo o conteúdo deste periódico, exceto onde está identificado, está licenciado sob uma Licença Creative Commons