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Revista internacional de contaminación ambiental
Print version ISSN 0188-4999
Abstract
ORTIZ-CORNEJO, Nadia Livia et al. Greenhouse gas emissions from a chinampa soil or floating gardens in Mexico. Rev. Int. Contam. Ambient [online]. 2015, vol.31, n.4, pp.343-350. ISSN 0188-4999.
Agriculture in chinampas or 'floating gardens', is still found on the south of Mexico City, it is a high yield pre-Columbian cultivation system, which has soils enriched with organic matter. The objective of this research was to determine the greenhouse gas (GHG) emissions from a chinampa soil cultivated with amaranth (Amaranthus hypochondriacus L.), maize (Zea mays L.) or uncultivated. The soil was characterized and fluxes of GHG (CO2, N2O and CH4) were monitored for one year. The chinampa soil was alkaline saline with an organic C content that ranged from 21.7 t/ha in the 0-20 cm layer of the soil cultivated with amaranth to 28.4 t/ha in the 20-40 cm layer of the uncultivated soil. The cumulative GHG emissions (kg CO2-equivalents/ha/y) were 395, 376 and 258 for N2O, and 44, 30 and 26 for CH4 in the uncultivated, amaranth cultivated and maize cultivated soil, respectively. No significant effect of cultivated crop or soil characteristics on GHG emissions over one year was found. In general, N2O contributed 91 % and CH4 9 % to the global warming potential of the GHG. The organic C was high and distributed equally over the soil profile, because it is an anthropic soil.
Keywords : GHG; fluxes of carbon dioxide; methane and nitrous oxide; global warming potential; C sequestration.