Dados do Trabalho

Título

ANALYSIS OF THE HUMIFICATION AND AROMATIC INDEX OF DOC IN LEACHATE SAMPLES FROM NAHUELBUTA SOIL COLUMN

Resumo

Soil Organic Matter's role is important in soil fertility, crop production, degradation, and erosion, among others. The effect on the humification degree (HI) and aromaticity index (SUVA-254) of adding an extract of leaves dissolved in water to soil columns was studied by assembling 24 reactors divided into four treatments and an analysis of nutrients on leachates for each reactor. Each reactor has an established amount of saprock-rock interface (saprolite from Nahuelbuta National Reserve), with a constant water flow per drip system. Group 1 reactors contain the saprock previously treated with gamma rays to kill microbial communities acting as a control. Group 2 reactors have saprock in natural conditions without adding organic material. Group 3 reactors have a monthly addition of dissolved organic matter, enhancing Fe and Al mobility and feeding natural bacteria. Group 4 reactors contain Nothofagus obliqua plants and have a water flow without organic material additions since the plant would provide exudates directly. Leachates from the reactors have been collected for six months. Preliminary results regarding the characterization of DOC, the PCA analysis found an important contribution of Aluminium, which explain the presence of peak spectrums of fluorescence shown at 530nm structure-like organometallic complexes between organic compounds and Al. The SUVA-254 (aromaticity degree) generally decreased over time while the humification degree increased. Relate to the DOC group produces increments in nitrate compounds. This effect may be related to the fact that the added DOC increases the content of structures with nitrate compounds.

Palavras-chave

DOC; SOIL PROCESS; NUTRIENTS

Instituição financiadora

Fondecyt/Conicyt Postdoc 3190919 AND PROYECTO SIA 85220124

Agradecimentos

FONDECYT PROYECTO 3190919 – POSTDOCTORADO. Vicerrectoría de Investigación y Desarrollo, Universidad de Concepción. BIOREN y Laboratorio de Suelo y Planta Instituto de Agroindustria, Universidad de la Frontera, Temuco - Chile. PROYECTO SIA 85220124