English   español  
Please use this identifier to cite or link to this item: http://hdl.handle.net/10261/82250
logo share SHARE logo core CORE   Add this article to your Mendeley library MendeleyBASE

Visualizar otros formatos: MARC | Dublin Core | RDF | ORE | MODS | METS | DIDL
Exportar a otros formatos:


Stabilization of N-compounds in soil and organic-matter-rich sediments—what is the difference?

AuthorsKnicker, Heike
Algal deposits
NMR spectroscopy
Issue Date2004
CitationMarine Chemistry 92(1): 167-195 (2004)
AbstractMost of the organic nitrogen in soils and sediments ultimately derives from living organisms where it is mainly present as peptides and amino acids. These biomolecules are considered to have a biologically labile chemical structure and are expected to be quickly mineralized during early stages of organic matter stabilization. In spite of this, nitrogen is still found in aged soils, recent and even fossilized sediments. To elucidate the nature of this recalcitrant nitrogen and the processes that are involved in its formation, solid-state 15N nuclear magnetic resonance (NMR) spectroscopy was recently introduced into geosciences and applied to various environments differing in the origin of their organic matter precursors as well as in chemical and physical conditions of the environment. Results obtained with this approach indicate that survival of peptide-like structures is a ubiquitous phenomenon, although the mechanisms for their stabilization may differ in different ecological systems. However, a conspicuous change in organic nitrogen composition is observed in fossilized sediments and for organic matter formed by vegetation fires. Cyclization and rearrangement of peptide structures result in the formation of heteroaromatic N during fossilization, which was not detected for recent sediments and soils. From this, it may be concluded that such compounds are only formed in environments in which abiotic transformation of biogenic precursors dominates over biotic degradation.
Description29 pages, 17 figures, 1 table, 155 references.
Appears in Collections:(IRNAS) Artículos
Files in This Item:
File Description SizeFormat 
Stabilization of N-compounds.pdf393,95 kBAdobe PDFThumbnail
Show full item record
Review this work

Related articles:

WARNING: Items in Digital.CSIC are protected by copyright, with all rights reserved, unless otherwise indicated.