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Revista Brasileira de Ciência do Solo

On-line version ISSN 1806-9657

Abstract

NOEMI COSENTINO, Vanina Rosa; FERNANDEZ, Patricia Lilia; FIGUEIRO AUREGGI, Santiago Andrés  and  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.

Keywords : soil N2O fluxes; climate change; GHG sampling.

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