SciELO - Scientific Electronic Library Online

 
vol.23 número2Fixação do N2 em leucena (Leucaena leucocephala) em solo da região semi-árida brasileira submetido à salinizaçãoCarbono, carbono da biomassa microbiana e atividade enzimática em um solo sob mata natural, pastagem e cultura do algodoeiro índice de autoresíndice de assuntospesquisa de artigos
Home Pagelista alfabética de periódicos  

Serviços Personalizados

Journal

Artigo

Indicadores

Links relacionados

Compartilhar


Revista Brasileira de Ciência do Solo

versão On-line ISSN 1806-9657

Resumo

ALVES, G. D.; SAMPAIO, E. V. S. B.; SALCEDO, I. H.  e  SILVA, V. M.. Mineralization potential of C and N in twenty soils from Pernambuco, Brazil. Rev. Bras. Ciênc. Solo [online]. 1999, vol.23, n.2, pp.245-256. ISSN 1806-9657.  http://dx.doi.org/10.1590/S0100-06831999000200008.

The C and N mineralization potential of 20 soils from Pernambuco, Brazil (10 from the humid area and 10 from the semi-arid) was determined in a greenhouse experiment, conducted from January to October 1987. Samples of 50 g from 0-20 and 20-40 cm depth layers were incubated. The released C-CO2 and the accumulated mineral N (NO3- and NH4+) were periodically measured during 20 and 4 weeks, respectively. The mineralized amounts varied much among soils. In spite of this they were higher in the humid than in the semi-arid area, being also higher in the 0-20 cm layer than in the 20-40 cm one. The soils presented different mineralization patterns along the incubation period: in the first weeks, there was either a lag or high mineralization and, in the last weeks, there was stabilization or progressive decline. The C curves tended to stabilization in the final phase than N curves. Mineralized amounts of C and N were significantly related to one another and to total soil C and N and mineralized N was related to N uptake by plants growing in pots with similar soils. Soil organic matter in the humid area was more labile than that in the semi-arid area, especially regarding N, and in the superficial layer rather than in the subsuperficial one.

Palavras-chave : C-CO2; organic matter; tropical humid area; tropical semi-arid area; nitrate; ammonium.

        · resumo em Português     · texto em Português     · Português ( pdf )

 

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