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Gas chromatography and photoacoustic spectroscopy for the assessment of soil greenhouse gases emissions Ciência Rural
Nicoloso,Rodrigo da Silveira; Bayer,Cimélio; Denega,Genuir Luis; Oliveira,Paulo Armando Victória de; Higarashi,Martha Mayumi; Corrêa,Juliano Corulli; Lopes,Letícia dos Santos.
Assessments of soil carbon dioxide (CO2), methane (CH4), and nitrous oxide (N2O) emissions are critical for determination of the agricultural practices' potential to mitigate global warming. This study evaluated the photoacoustic spectroscopy (PAS) for the assessment of soil greenhouse gases (GHG) fluxes in comparison to the standard gas chromatography (GC) method. Two long-term experiments with different tillage and cropping systems over a Paleudult were evaluated using static chambers. PAS measurements of CO2 and N2O concentrations showed good relationship and linearity (R2=0.98 and 0.94, respectively) with GC results. However, CH4 measurements were significantly affected by air sample moisture which interfered on CH4 detection by PAS. Overestimation of...
Tipo: Info:eu-repo/semantics/article Palavras-chave: No-tillage; Conventional tillage; Cover crops; INNOVA 1412.
Ano: 2013 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782013000200012
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Methane fluxes from waterlogged and drained Histosols of highland areas Rev. Bras. Ciênc. Solo
Rachwal,Marcos Fernando Glück; Zanatta,Josiléia Acordi; Dieckow,Jeferson; Denega,Genuir Luis; Curcio,Gustavo Ribas; Bayer,Cimélio.
Soil can be either source or sink of methane (CH4), depending on the balance between methanogenesis and methanotrophy, which are determined by pedological, climatic and management factors. The objective of this study was to assess the impact of drainage of a highland Haplic Histosol on CH4 fluxes. Field research was carried out in Ponta Grossa (Paraná, Brazil) based on the measurement of CH4 fluxes by the static chamber method in natural and drained Histosol, over one year (17 sampling events). The natural Histosol showed net CH4 eflux, with rates varying from 238 µg m-2 h-1 CH4, in cool/cold periods, to 2,850 µg m-2 h-1 CH4, in warm/hot periods, resulting a cumulative emission of 116 kg ha-1 yr-1 CH4. In the opposite, the drained Histosol showed net...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Greenhouse gas; Water sources; Water-table; Gravimetric moisture; Air temperature; Rainfall.
Ano: 2014 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832014000200013
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