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Simultaneous quantification of depolymerization and mineralization rates by a novel 15N tracing model

Journal article
Authors Louise C. Andresen
Anna-Karin Björsne
Samuel Bodé
Leif Klemedtsson
Pascal Boeckx
Tobias Rütting
Published in SOIL
Volume 2
Pages 433-442
ISSN 2199-398X
Publication year 2016
Published at Department of Earth Sciences
Pages 433-442
Language en
Links https://doi.org/10.5194/soil-2-433-...
Subject categories Other Earth and Related Environmental Sciences, Bioinformatics (Computational Biology)

Abstract

The depolymerization of soil organic matter, such as proteins and (oligo-)peptides, into monomers (e.g. amino acids) is currently considered to be the rate-limiting step for nitrogen (N) availability in terrestrial ecosystems. The mineralization of free amino acids (FAAs), liberated by the depolymerization of peptides, is an important fraction of the total mineralization of organic N. Hence, the accurate assessment of peptide depoly- merization and FAA mineralization rates is important in order to gain a better process-based understanding of the soil N cycle. In this paper, we present an extended numerical 15 N tracing model Ntrace , which incorporates the FAA pool and related N processes in order to provide a more robust and simultaneous quantification of de- polymerization and gross mineralization rates of FAAs and soil organic N. We discuss analytical and numerical approaches for two forest soils, suggest improvements of the experimental work for future studies, and conclude that (i) when about half of all depolymerized peptide N is directly mineralized, FAA mineralization can be as important a rate-limiting step for total gross N mineralization as peptide depolymerization rate; (ii) gross FAA mineralization and FAA immobilization rates can be used to develop FAA use efficiency (NUEFAA), which can reveal microbial N or carbon (C) limitation.

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