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Transformations in soil of the organic fractions from 15N labelled compost as revealed by 13C and 15N NMR spectroscopies and analytical pyrolysis

AutorGonzález-Vila, Francisco Javier ; Tinoco, Pilar; Zancada Fernández, M. Cristina ; Almendros Martín, Gonzalo
Palabras clave15N/14N ratios
Humic acid
Fulvic acid
Fecha de publicación2001
EditorORBIT 2001
CitaciónProceedingsof the International Conference ORBIT 2001 on Biological processing of waste: a product-oriented perspective I: 53-62 (2001)
Organic Recovery and Biological Treatment (ORBIT)
ResumenA molecular assessment of different C and N forms from a compost-treated soil has been performed by NMR spectroscopy and pyrolysis-gas chromatography-mass spectrometry. A 15N-enriched mixture of urban compost (30%), wheat straw (64%) and K15NO3 (6%) incubated for 80 days was used to isolate different fractions: water-soluble (WS), humic acid-like (HA), fulvic acid-like (FA), and alkali-insoluble fractions. This compost (21.8% N as 15N) was added to a mineral soil and incubated for 80 days. These fractions and two particulate ones were isolated from the composttreated soil. The stable isotope ratios (15N/14N) of each fraction were compared to monitor the N speciation patterns in soil. Most of the newly-formed N-compounds concentrate in WS (96% 15N) and in the insoluble residue (>25% 15N) but about 28% consists of amide N in the HA. According to spectroscopic and pyrolytic data the HA resembles to a lignoprotein, whereas the FA consists of a C=O-containing carbohydrate material. Alkyl compounds suggesting the presence of lipid macromolecules are released mainly by particulate fractions. The WS (1.7% of total N) showed heterogeneous composition yielding methoxyphenols, furans, fatty acids and N-compounds (mainly pyrroles). Our results suggest that non-selective biodegradation of the different C and N forms dominates over the formation of humic substances.
Descripción9 pages, 3 figures, 4 tables, 16 references. The authors wish to thank Mrs. Trinidad Verdejo for technical assistance, Dr. Serafín González for the 15N/14N measurements, Mr. Eutiquio Barbero for the elemental analyses. Conferencia celebrada en Sevilla, 9 a 12, mayo, 2001.
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