SciELO - Scientific Electronic Library Online

 
vol.36 número6Caracterização da fertilidade do solo e sistema radicular de floresta de restingaSistema integrado de diagnose e recomendação (DRIS) para diagnóstico do teor de óleo em grão de soja 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

NOEMI COSENTINO, Vanina Rosa; FERNANDEZ, Patricia Lilia; FIGUEIRO AUREGGI, Santiago Andrés  e  TABOADA, Miguel Angel. N2O emissions from a cultivated mollisol: optimal time of day for sampling and the role of soil temperature. Rev. Bras. Ciênc. Solo [online]. 2012, vol.36, n.6, pp.1814-1819. ISSN 1806-9657.  http://dx.doi.org/10.1590/S0100-06832012000600015.

The correct use of closed field chambers to determine N2O emissions requires defining the time of day that best represents the daily mean N2O flux. A short-term field experiment was carried out on a Mollisol soil, on which annual crops were grown under no-till management in the Pampa Ondulada of Argentina. The N2O emission rates were measured every 3 h for three consecutive days. Fluxes ranged from 62.58 to 145.99 ∝g N-N2O m-2 h-1 (average of five field chambers) and were negatively related (R2 = 0.34, p < 0.01) to topsoil temperature (14 - 20 ºC). N2O emission rates measured between 9:00 and 12:00 am presented a high relationship to daily mean N2O flux (R2 = 0.87, p < 0.01), showing that, in the study region, sampling in the mornings is preferable for GHG.

Palavras-chave : soil N2O fluxes; climate change; GHG sampling.

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

 

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