Publications des scientifiques de l'IRD

Neto M. S., Piccolo M. D., Costa C., Cerri C. C., Bernoux Martial. (2011). Emissao de gases do efeito estufa em diferentes usos da terra no bioma cerrado = Greenhouse gas emission caused by different land-uses in Brazilian savannah. Revista Brasileira de Ciencia do Solo, 35 (1), p. 63-76. ISSN 0100-0683.

Titre du document
Emissao de gases do efeito estufa em diferentes usos da terra no bioma cerrado = Greenhouse gas emission caused by different land-uses in Brazilian savannah
Année de publication
2011
Type de document
Article référencé dans le Web of Science WOS:000289013700006
Auteurs
Neto M. S., Piccolo M. D., Costa C., Cerri C. C., Bernoux Martial
Source
Revista Brasileira de Ciencia do Solo, 2011, 35 (1), p. 63-76 ISSN 0100-0683
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 land uses in the Cerrado biome (Rio Verde county, State of Goias - Brazil). The climate (Koppen-Geiger) was classified as Aw and the soil as Latossolo Vermelho distrofico caulinitico I a clayey kaolinitic Oxisol under original Cerrado (Brazilian savanna) vegetation. The experiment was arranged in a completely randomized design (CRD) with four treatments (areas): Native vegetation - Cerrado (CE); brachiaria pasture (PA); soybean in conventional tillage (SC) and no-tillage (NT) corn followed by millet. No significant differences in annual CO2 and N2O emissions were observed between treatments. This can be explained by the variability of gas fluxes due to climate seasonality, with lower emissions in the winter due to low soil moisture. Mean emissions of CO2 were 108.9 +/- 85.6 mu g m(-2) h(-1), and N2O 13.5 +/- 7.6 mu g m(-2) h(-1). For CH4 significant differences in the fluxes were only observed in pasture (32 mu g m(-2) h(-1)), while in the other areas inflows between 46 and 15 mu g m(-2) h(-1) were observed. The GHG fluxes showed close correlation with soil moisture. The N-NO3- emissions were significantly correlated with CO2-emissions in all areas. Considering all treatments together, the three GHG fluxes were correlated with the microbial C and N contents. However, the Cmicro: Nmicro ratio was not significantly correlated with the GHG flux. Only for pasture the CO2 and N2O fluxes were correlated with the content of soil inorganic-N. Results suggested that the GHG fluxes in the Cerrado are related to rainfall, mainly in farming areas treated with high fertilizer closes to increase productivity.
Plan de classement
Sciences du milieu [021] ; Pédologie [068]
Localisation
Fonds IRD [F B010051865]
Identifiant IRD
fdi:010051865
Contact