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Carbon stabilization mechanisms in high mountain volcanic soils from Teide National Park (Tenerife, Spain).

AuthorsRodríguez Rodríguez, A.; Rodríguez Eugenio, N.; Arbelo, C. D.; González-Pérez, José Antonio
Issue Date24-Jun-2019
PublisherInternational Union of Soil Sciences
Citation8th ISMOM - International Symposium on Interactions of Soil Minerals with Organic Components and Microorganisms (Poster S 1.27) (2019)
AbstractVolcanic soils accumulate soil organic matter (SOM) usually through the formation of organo-mineral complexes. In terms of residence time, SOM quality depends on whether it is free or associated to the mineral fraction forming metal (non-allophanic andosols) or allophane complexes (allophanic andosols). Here, the main carbon sequestration mechanisms acting in high mountain volcanic ash soils are investigated. Diagnostic A horizons (19) representative of the main parent materials, vegetation and climatic conditions were sampled in soils from Teide National Park, Tenerife, Canary Islands. Physical and chemical properties possibly controlling SOM accumulation were analysed including an estimation of the metal active forms (Alo, Feo and Sio) and organometallic complexes (Cp, Alp, Fep and Sip). This allowed an estimation of the organic carbon complexaton forms present in the soil i.e. in the form of Al-humus, Fe-humus or associated to allophane, ferrihydrite or halloysite. In addition, two density soil fractions (¿light < 1.9 g ml-3 < ¿heavy) were separated with a tungsten salt solution. The molecular SOM structure was studied in detail by direct analytical pyrolysis (Py-GC/MS) at 500º C in the bulk soil and in the two density fractions. In search of molecular markers, also different parts of the predominant plants and of decaying litter were also analysed. Our findings point to the occurrence of two distinct mechanisms for SOM protection dependent on soil type 1) In allophanic soils, SOM seems to be mainly associated to non-crystalline organo-mineral complexes, is rich in polysaccharides and N-compounds probably from chitin. 2) In non-allophanic soils, a selective preservation mechanism is observed, SOM composition is dominated by relatively unaltered plant components related to a protective effect of amorphous minerals favoring organo-metal complexes/coatings and SOM preservation more or less unaltered in a sort of inherited humin.
DescriptionPóster con 3 figuras y 9 referencias presentado en el ISMOM 2019 - 8th International Symposium on Interactions of Soil Minerals with Organic Components and Microorganisms: (Póster S 1.27), 23-28 june, Sevilla (Spain)
Appears in Collections:(IRNAS) Comunicaciones congresos
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