Estudio de la dinámica de las fracciones orgánicas en diferentes usos de suelo en la microcuenca Llin Llin cantón Colta

ABSTRACT Changes in soil use (CUS) are the result of anthropogenic activities, which have negative effects on the soil physical-chemical properties, especially on organic matter (MO). The greatest variation occurs in fragile areas of high diversity, such as páramo ecosystems, that is why they are of great interest to the scientific community. The objective of this research work was to determine the dynamics of the active and passive organic fractions in different land uses such as moorland, pasture and crop. A randomized experimental block design was used in plots of 25 x 25 m2 with 10 replicates of composite samples at a depth of 0-30 cm. A physical fractionation was performed for each particle size to determine the amount of MO incorporated in each fraction, an analysis of pH, NaF test, color and bulk density was carried out. The active fraction of soil under cultivation showed a 47% decrease in organic carbon (OC) levels, while soil under pasture decreased by 27%. In the passive fraction of low moor soils there is a higher concentration of CO with an average of 139 g/kg, but there is no significant difference when compared to the concentration of CO in soils under pasture where the average values are 127 g/kg; however, these two lands use show significant differences with respect to the use under cultivation, which has a concentration of 102 g/kg. The economic value of the páramo soils to contain carbon was calculated to be approximately 31 million US dollars. Keywords: Carbon, Change of land use, Organic Matter, Fractions.

• Autor principal: Erazo Chicaiza, Hillary Belen (author)
• Otros Autores: Guananga Ortega, Pamela Roxana (author)
• Formato: bachelorThesis
• Lenguaje: spa
• Publicado: 2022
• Materias: Carbono; Cambio de uso de suelo; Materia Orgánica; Fracciones.
• Acceso en línea: http://dspace.unach.edu.ec/handle/51000/10214