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Patricia Lilia Fernandez ; Santiago Andrés Figueiro Aureggi ; Miguel Angel Taboada ;Revista Brasileira de Ciência do Solo 2012, 36 6

Autor: Vanina Rosa Noemi Cosentino

Fuente: http://www.redalyc.org/


Introducción



Revista Brasileira de Ciência do Solo ISSN: 0100-0683 revista@sbcs.org.br Sociedade Brasileira de Ciência do Solo Brasil Cosentino, Vanina Rosa Noemi; Fernandez, Patricia Lilia; Figueiro Aureggi, Santiago Andrés; Taboada, Miguel Angel N2O EMISSIONS FROM A CULTIVATED MOLLISOL: OPTIMAL TIME OF DAY FOR SAMPLING AND THE ROLE OF SOIL TEMPERATURE Revista Brasileira de Ciência do Solo, vol.
36, núm.
6, 2012, pp.
1814-1819 Sociedade Brasileira de Ciência do Solo Viçosa, Brasil Available in: http:--www.redalyc.org-articulo.oa?id=180225136023 How to cite Complete issue More information about this article Journals homepage in redalyc.org Scientific Information System Network of Scientific Journals from Latin America, the Caribbean, Spain and Portugal Non-profit academic project, developed under the open access initiative 1814 Vanina Rosa Noemi Cosentino et al. Nota N2O EMISSIONS FROM A CULTIVATED MOLLISOL: OPTIMAL TIME OF DAY FOR SAMPLING AND THE ROLE OF SOIL TEMPERATURE (1) Vanina Rosa Noemi Cosentino(2), Patricia Lilia Fernandez(3), Santiago Andrés Figueiro Aureggi(4) & Miguel Angel Taboada(5) SUMMARY 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 μg 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. Index terms: soil N2O fluxes, climate change, GHG sampling. RESUMO: EMISSÕES DE N2O DE UM CHERNOSSOL...





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