Evaluación del secuestro de carbono en sedimentos de manglar de cuatro edafopaisajes en dos islas del archipiélago de Galápagos

Abstract

Carbon sequestration in the sediments of four edafpho landscapes of two islands of the Galapagos archipelago was evaluated, this was carried out through previously studied sampling points and taking into account the spatial distribution of the mangrove along the extension of each edafo landscape. Subsequent to the sampling, analyzes of physical-chemical parameters of the sediment were developed and the relationship of the organic carbon content of the sediment was evaluated by means of calcination or loss on ignition (LOI) and direct combustion (DUMAS) methods. The results showed values of: pH that tend to be acidic to close to neutral (4.5-7.4), a strongly saline electrical conductivity with an average of 10 mS / cm, a textural variability (medium-fine sand, mainly), the percentage humidity above 40%, average apparent density of 0.55 g / cm3 and an OM content of up to 20%, the estimation of CO2 - eq presented high emissions in the edafo landscapes of Isabela Island, Las Diablas with 1308 ± 197.52 Mg CO2 eq / ha and Baltazar with 835 ± 329.50 Mg CO2 eq / ha, while the edapho landscapes of Santa Cruz Island presented lower emissions. The quantification by DUMAS of COS between the preserved and non-preserved edapho landscapes of the two islands of the Galapagos archipelago showed high values in Las Diablas (preserved) with 356 Mg / ha and Baltazar (not preserved) with 227 Mg / ha of the island Isabela, while for the case of the edafo landscapes of Santa Cruz Island it was significantly lower than those of Isabela Island, presenting the same case with the LOI method. Likewise, the F-test in the ANOVA table determined that, if there are significant differences between the means, therefore, it is concluded that the carbon sequestration in the mangrove sediments varies as a function of the edapho-landscape.