INFIQC   05475
INSTITUTO DE INVESTIGACIONES EN FISICO- QUIMICA DE CORDOBA
Unidad Ejecutora - UE
artículos
Título:
Land use impact on chemical and spectroscopical characteristics of soil organic matter in an arid ecosystem.
Autor/es:
IRIARTE A; KOWALJOW E; VAZQUEZ C; ABRIL A; MERLO C; MERILES J M
Revista:
Environmental Earth Sciences
Editorial:
Springer Berlin Heidelberg
Referencias:
Lugar: Berlin; Año: 2016 vol. 75 p. 883 - 893
ISSN:
1866-6280
Resumen:
Soil organic matter (SOM) storage and composition in woody ecosystemsmay change as result of long-term of livestock and soil cultivation,particularly in arid environments. Weevaluated the changes produced in both quantity and quality of SOM due toproductive managements. The impact of land use change of SOM, dissolved and hot water-extractable C (DOCand HWC), humic substances (HS), humic acids (HA), fulvic acids (FA) and infrared and visible spectroscopy of HS were studiedin three productive sites: total and selective clearings with livestock(TC-livestock and SC-livestock), total clearing with irrigated agriculture(TC-agriculture), and an un-disturbed site located in central-western of Argentina.SOM content was higher in un-disturbed andTC-agriculture site. The DOC varied among the study sites only during dryseason. HWC decrease during wet season which clearlyindicates the lability of this fraction. Theconcentrations of HS, HA, and FA were reduced (50-75%) by land usechange. HS composition by Infrared Spectroscopy reflected a major quantity of polysaccharidesin TC-agriculture, while ratio E4/E6 (UV-vis) presented low values in un-disturbedsite, indicating a high degree of condensation of aromatic substances. Inconclusion, a) the conversion of native woodlands to livestock systems favorssoil C losses, b) the highest SOM storage in TC-agriculture may reflect greaterresidue accumulation at the soil surface and c) the combination of differenttechniques provided a very good insight about the status of soil degradation.