NDLI: Incorporation of N from burnt and unburnt $^{15}$N grass residues into the peptidic fraction of fire affected and unaffected soils

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

Content Provider	Springer Nature Link
Author	López Martín, María wak, Karolina M. Milter, Anja Knicker, Heike
Copyright Year	2016
Abstract	To 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 $^{15}$N from $^{15}$N-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 $^{15}$N-enriched grass residues ($^{15}$N-OM), its $^{15}$N-PyOM, mixtures of KNO$_{3}$ (N$_{i}$) and $^{15}$N-OM or $^{15}$N-PyOM, as well as K$^{15}$NO$_{3}$ 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 $^{15}$N ($^{15}$N$_{add}$) 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 $^{15}$N$_{add}$ recovered in AAs were always higher for the burnt soil. Stabilization of proteinaceous residues during the incubation was indicated. Already after 2 weeks, $^{15}$N$_{add}$ from $^{15}$N-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.
Starting Page	1554
Ending Page	1564
Page Count	11
File Format	PDF
ISSN	14390108
Journal	Journal of Soils and Sediments
Volume Number	17
Issue Number	6
e-ISSN	16147480
Language	English
Publisher	Springer Berlin Heidelberg
Publisher Date	2016-12-15
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Amino acids Black nitrogen Incubation experiment Isotope ratio mass spectrometry N turnover in post-fire soils Pyrogenic organic matter Soil Science & Conservation Environment Environmental Physics
Content Type	Text
Resource Type	Article
Subject	Stratigraphy Earth-Surface Processes

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