Gaseous exchanges between methane and nitrous oxide between soil and atmosphere in different types of cover in western Pará, Brazil
DOI:
https://doi.org/10.6008/CBPC2179-6858.2018.006.0001Keywords:
Trace gases, Methane, Nitrous oxide, Change in land useAbstract
The change in land use and management has been occurring dynamically and intensely, especially in the Amazon region, which can result in a source or drain of greenhouse gases into the atmosphere. This work quantified the gas exchange of methane (CH4) and nitrous oxide (N2O) between soil and atmosphere in different types of cover, and analyzed the environmental variables regulating the gas exchange in different microbasins of the western region of Pará state. carried out through field-installed chambers, subsequently analyzed by gas chromatography. There was no significant difference in methane flow through the effects of land use change on soybean (0,23mg-C/m2/h), pasture (0,31mg-C/m2/h) and capoeira (0,42mg-C/m2/h). Statistical difference was found between the nitrous oxide flux related to the type of soil cover, where the capoeira flow (19,57mg-N/m2/h) was lower than the pasture (36,81mg-N/m2/h) and agriculture (40,08mg-N/m2/h). There was a difference between the methane fluxes found in soybean in no-tillage system (0,29mg-C/m2/h) in relation to the conventional tillage system (0,11mg-C/m2/h). There was also a difference in nitrous oxide flow from no-till (40,7mg-N/m2/h) that was higher than conventional tillage (38,8mg-N/m2/h). Faced with increasingly frequent land use changes, there is a need for new forms of management that seek to reduce emissions of these gases or increase their sinks.
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