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Incorporation of N from burnt and unburnt 15N grass residues into the peptidic fraction of fire affected and unaffected soils

AutorLópez Martín, María ; Nowak, Karolina M.; Milter, Anja; Knicker, Heike
Palabras claveAmino acids
Black nitrogen
Incubation experiment
Isotope ratio mass spectrometry
N turnover in post-fire soils
Pyrogenic organic matter
Fecha de publicaciónjun-2017
CitaciónJournal of Soils and Sediments 17(6): 1554-1564 (2017)
ResumenTo reveal if the input of pyrogenic organic matter (PyOM) affects the nitrogen (N) cycling in soil and its N can be used for the synthesis of microbial biomass, we investigated the incorporation of N-15 from N-15-enriched grass residues (OM) or their PyOM into extractable amino acids (AAs) of soil organic matter (SOM) from an unburnt and a burnt soil amended with those residues. Pots seeded with Lolium perenne and filled with soil from a burnt and an unburnt Cambisol from southern Spain were topped either with N-15-enriched grass residues (N-15-OM), its N-15-PyOM, mixtures of KNO3 (N-i) and N-15-OM or N-15-PyOM, as well as (KNO3)-N-15 mixed with non-enriched OM or PyOM. After incubation of the pots for up to 16 months under controlled conditions, the AAs, extracted from the litter-free soil, were quantified by gas chromatography mass spectrometry (GC/MS). The fate of the added N-15 (N-15(add)) was followed by isotopic ratio mass spectrometry (IRMS) and analyzed by statistical means. The contribution of extractable AAs to SOM of the non-amended burnt soil was twice of that for the unburnt soil. After amendment, their yields and the percentage of N-15(add) recovered in AAs were always higher for the burnt soil. Stabilization of proteinaceous residues during the incubation was indicated. Already after 2 weeks, N-15(add) from N-15-PyOM was recovered within the AAs. Our experiment confirmed that N from PyOM is incorporated into the peptidic fraction of SOM of post-fire soils. The efficiency of this incorporation is not altered by the presence of N-i and vice versa. We demonstrated further a short-term and medium-term impact of fire on N cycling in soils, expressed by alteration of the contribution of acid-extractable AAs to the soil organic N (SON) pool.
Descripción11 páginas.-- 6 figuras.-- 5 tablas.-- 36 referencias
Versión del editorhttp://doi.org/10.1007/s11368-016-1624-x
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