Plant rhizodeposition a key factor for soil organic matter formation in stable fractions

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Soil organic carbon formation remains poorly understood despite its importance for human livelihoods. Uncertainties remain for the relative contributions of aboveground, root, and rhizodeposition inputs to particulate (POC) and mineral-associated (MAOC) organic carbon fractions. Combining a novel f...

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Detalles Bibliográficos
Otros Autores: Villarino, Sebastián Horacio, Pinto, Priscila, Jackson, Robert B., Piñeiro, Gervasio
Formato: Artículo
Lenguaje:Inglés
Materias:
RHIZODEPOSITION
SOIL ORGANIC CARBON
INCUBATION EXPERIMENTS
Acceso en línea:http://ri.agro.uba.ar/files/download/articulo/2021villarino.pdf
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Aporte de:Registro referencial: Solicitar el recurso aquí
Biblioteca Central (FAUBA) de Universidad de Buenos Aires
Descripción
Sumario:Soil organic carbon formation remains poorly understood despite its importance for human livelihoods. Uncertainties remain for the relative contributions of aboveground, root, and rhizodeposition inputs to particulate (POC) and mineral-associated (MAOC) organic carbon fractions. Combining a novel framework with isotope tracer studies, we quantified POC and MAOC formation efficiencies (% of C-inputs incorporated into each fraction). We found that rhizodeposition inputs have the highest MAOC formation efficiency (46%) as compared to roots (9%) or aboveground inputs (7%). In addition, rhizodeposition unexpectedly reduced POC formation, likely because it increased decomposition rates of new POC. Conversely, root biomass inputs have the highest POC formation efficiency (19%). Therefore, rhizodeposition and roots appear to play opposite but complementary roles for building MAOC and POC fractions.
ISSN:2375-2548

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