Characterisation of organic matter from organo-mineral complexes in an Andosol from Reunion Island

Investigating the deepest part of a volcano plumbing system: Evidence for an active magma path below the western flank of Piton de la Fournaise (La Réunion Island)

“…GIT on Fig. 6) could reflect local enrichment in organic matter as supported by their low δ 13 C signature (Basile-Doelsch et al, 2007;de Junet et al, 2013 ). On another side, high soil CO 2 fluxes defining a wide zone is more prone to track a real magmatic contribution, the δ 13 C signature being affected by secondary processes.…”

“…This peculiar condition is explicable, most probably, by the tropical oceanic climate, which is marked by extreme precipitation rates and a high average temperature, allowing substratum degradation and fast vegetation development. Some authors (Basile-Doelsch et al, 2007;de Junet et al, 2013) have evidenced that andosols at La Réunion Island have a strong potential organic matter sequestration due to the absence of aluminosilicate minerals. However, recent studies carried out on the whole edifice have revealed that at Piton de la Fournaise there are also several sites marked by high soil CO 2 fluxes with a δ 13 C signature typical of a magmatic origin of the emitted gas.…”

Influence of extractants and filter materials in the extraction of dissolved organic matter (DOM) from subtropical agricultural soil

“…Hydrophilic compounds are more readily used by microorganisms, whereas hydrophobic compounds are refractory (Lichter et al, 2005;Kalbitz and Kaiser, 2008). Soil colloidal matter is rich in humic acid, which is composed of aromatic compounds, saccharides, and fatty acids (Junet et al, 2013;Chen and Sparks, 2015). Finally, cell walls are the primary organelles of bacteria, and contain peptidoglycans, teichoic acid, lipopolysaccharides, and so on (Cummins and Harris, 1956).…”

Metodología para obtener ácidos húmicos y fulvicos y su caracterización mediante espectrofotometría infrarroja

“…Hasta 67% de las 1 500 Gt de C orgánico del suelo están presentes entre 20 y 100 cm de profundidad, el C orgánico del suelo recibe el nombre de materia orgánica (MO), se compone de una mezcla heterogénea de compuestos orgánicos de diversos orígenes. En el subsuelo la MO se asocia principalmente con fases minerales y ambos forman agrupaciones orgánico-minerales, la formación de estos agrupamientos protege la MO de la degradación, sin embargo, los suelos no están hechos solo de minerales o sustancias orgánicas, estos dos componentes interactúan entre si y por lo tanto controlan la química de la superficie del suelo; estas interacciones son importantes, pero en especial los suelos que reciben o acumulan grandes cantidades de sustancias orgánicas (Juneta et al, 2013).…”

“…Up to 67% of the 1500 Gt of soil organic C is present between 20 and 100 cm deep, the soil organic C is called organic matter (OM), consists of a heterogeneous mixture of organic compounds of different origins. The subsoil OM is mostly associated with mineral phases forming organic-mineral complexes, which prevent MO degradation, however, the soils are not only made of mineral or organic substances, these two components interact with one another, therefore controlling the soil surface chemistry, these interactions are important, but especially soils receiving or accumulating large quantities of organic substances (Juneta et al, 2013).…”