Bioavailability of N released from N-rich pyrogenic organic matter: An incubation study |
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Authors: | José M. de la Rosa,Heike Knicker |
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Affiliation: | aInstituto Tecnológico e Nuclear, Grupo de Química Analítica e Ambiental, Estrada Nacional 10, 2686-953 Sacavém, Portugal;bInstituto de Recursos Naturales y Agrobiología, C.S.I.C., Avenida Reina Mercedes 10, 41080 Seville, Spain |
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Abstract: | In Mediterranean ecosystems, natural wildfires and prescribed burning play an important role. In order to obtain a better understanding of the impact of charcoal on the nitrogen (N) cycling in soil, 15N-enriched pyrogenic organic material (PyOM) obtained from “Lolium perenne” charred for 4 min at 350 °C was mixed with a typical Mediterranean agricultural soil and incubated for 72 days under controlled conditions. The main objectives were to analyze the availability of N from this material and to obtain more insight into the recalcitrance of PyOM in soils. Addition of artificially produced 15N-PyOM increased the biomass production and N retention. After 72 days of incubation time, 10% of the 15N added to the soil (15Nadd) was incorporated into new grass biomass. Solid-state 15N NMR spectroscopy revealed that at least some of this N derived from the degradation of pyrrole-type structures. Increase of the amide-N intensity in the solid-state 15N NMR spectrum of the incubated soils indicated further that some 15N from the PyOM was also incorporated into new microbial biomass. Our results confirmed a relatively low recalcitrance of N-rich PyOM. Since during its degradation, N is only slowly transferred into a plant-available form, it may contribute to the observed improvement of soil fertility by avoiding fast N losses due to leaching and volatilization as a slow N-release fertilizer. |
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Keywords: | N-fertilization Plant-available N Black nitrogen Recalcitrance of PyOM Prescribed burning |
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