%0 Journal Article
%T Avalia  o dos compartimentos da mat¨¦ria organica em ¨¢rea de Mata Atlantica = Assessment of organic matter compartments in an Atlantic Forest area
%A Ademir Fontana
%A Cristiane Figueira da Silva
%A Marcos Gervasio Pereira
%A Arcangelo Loss
%J Acta Scientiarum : Agronomy
%D 2011
%I 
%X Este trabalho objetivou avaliar os compartimentos da mat¨¦ria organica do solo (MOS) em ¨¢reas com diferentes coberturas vegetais no entorno do Parque Estadual da Serra do Mar, Ubatuba, Estado de S o Paulo. Foram selecionadas ¨¢reas cultivadas com as culturas de mandioca (monocultivo) e banana (sistema agroflorestal), uma ¨¢rea sob capoeira e outra sob floresta secund¨¢ria (Mata Atlantica). Nestes locais foram coletadas amostras nas profundidades de 0-5 e 5-10 cm nos meses de julho/2003 (inverno) e mar o/2004 (ver o). Foram determinados o teor de carbono organico total (COT), as substancias h¨²micas com os teores de carbono organico na fra  o ¨¢cidos f¨²lvicos (C-FAF), fra  o ¨¢cidos h¨²micos (C-FAH) e humina (C-HUM) e a rela  o C-FAH/C-FAF e a mat¨¦ria organica leve (MOL). Os teores de COT variaram entre 26,3 e 35,7 g kg-1 e 20,2 e 33,1 g kg-1, nas camadas de 0-5 e 5-10 cm, respectivamente. Os teores de COT foram similares e maiores para as ¨¢reas de floresta e banana enquanto que os teores de MOL foram maiores e similares entre as ¨¢reas de banana e capoeira. Para as substancias h¨²micas, a fra  o humina predominou e apresentou pequena varia  o entre as coberturas, seguido pelo CFAF, o qual foi menor nas ¨¢reas de banana e mandioca. Os valores de C-FAH foram menores na¨¢rea cultivada com mandioca. This study has as objective to evaluate the soil organic matter (SOM) compartments in areas with different vegetables coverings in the around of Serra do Mar State Park, Ubatuba, S o Paulo State. Were selected areas of cassava (monoculture), banana (agroforest system), scrub and secondary forest (Atlantic Forest) and samples of soil were taken at 0-5 and 5-10 cm depths in July 2003 (winter) and March 2004 (summer). Were quantified the total organic carbon (TOC), the humic substances with tenors of organic carbon in the fulvic acid fraction (C-FAF); humic acid fraction (C-HAF) and humin (C-HUM) and the C-FAH/C-FAF ratio and the light organic matter (LOM). The tenors of COT varied between 26.3 - 35.7 g kg-1 and 20.2 - 33.1 g kg-1, 0-5and 5-10 cm depth, respectively. The tenors of COT were similar between the forest and banana areas. The tenors of MOL were similar between the banana and scrub areas. For the humic substances, the C-HUM predominated and presented small variation between coverings,followed by C-FAF, which was lesser in the banana and cassava areas and C-HAF with small tenors in the cassava area.
%K carbono organico
%K substancias h¨²micas
%K mat¨¦ria organica leve
%K organic carbon
%K humic substances
%K light organic matter
%U http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/5169/5169