4 results

Greenhouse gas emission caused by different land-uses in brazilian Savannah

Marcos Siqueira Neto, Marisa de Cássia Piccolo, Ciniro Costa Junior, Carlos Clemente Cerri, Martial Bernoux

01/Feb/2011

The conversion of native forests by cutting and burning into farming areas leads to alterations in the dynamics of soil organic matter, with changes in emissions of greenhouse gases (GHGs: CO2, CH4 and N2O) from the biosphere to the atmosphere. These cause an average temperature rise and, consequently, global climate change. The aim of this study was to examine relationships between the fluxes of CO2, CH4 and N2O with moisture, microbial biomass and inorganic N forms in soil with different […]

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Carbon and nitrogen mineralization in soils under an eucalyptus plantation chronosequence

Patrícia Anjos Bittencourt Barreto, Emanuela Forestieri Gama-Rodrigues, Antonio Carlos Gama-Rodrigues, Nairam Félix de Barros, Bruno José Rodrigues Alves, Sebastião Fonseca

01/Jun/2010

To maximize the efficiency of N uptake by plants it is important to study N and C mineralization, particularly in the case of eucalyptus, which has a very low response to nitrogen fertilization. The rates of C and N mineralization and C and N mineralization potential were estimated, in soils under 1, 3, 5, and 13 year-old eucalyptus plantations with similar soil and climatic conditions. Soil from the 0-10 cm layer was sampled in November 2003. The samples were incubated under aerobic […]

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CO2, CH4 and N2O fluxes in an Ultisol treated with sewage sludge and cultivated with castor bean

Jonas Jacob Chiaradia, Marcio Koiti Chiba, Cristiano Alberto de Andrade, Janaína Braga do Carmo, Claudeir de Oliveira, Arquimedes Lavorenti

01/Dec/2009

Organic residue application into soil alter the emission of gases to atmosphere and CO2, CH4, N2O may contribute to increase the greenhouse effect. This experiment was carried out in a restoration area on a dystrophic Ultisol (PVAd) to quantify greenhouse gas (GHG) emissions from soil under castor bean cultivation, treated with sewage sludge (SS) or mineral fertilizer. The following treatments were tested: control without N; FertMin = mineral fertilizer; SS5 = 5 t ha-1 SS (37.5 kg ha-1 N); SS10 […]

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Carbon stock and carbon dioxide emissions as affected by soil management systems in Southern Brazil

Falberni de Souza Costa, Cimélio Bayer, Josiléia Acordi Zanatta, João Mielniczuk

01/Feb/2008

Carbon (C) addition through crop residues (residue-C), C dioxide emission (CO2-C) and the soil C stock (soil-C) are components of the C cycle in the soil-plant-atmosphere system. This 18-year study was conducted to identify agricultural practices that could potentially increase C retention in the soil and lessen global warming trends. The three C pools (residue-C, CO2-C and soil-C) under different tillage systems (CT-conventional tillage and NT-no tillage) and cropping systems (O/M-oat (Avena strigosa Schreb)/maize (Zea mays L.) and V/M-vetch (Vicia […]

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