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Título: | Composition of organic N in temperate humid region soils (NW Spain) |
Autor: | González Prieto, Serafín Jesús CSIC ORCID ; Carballas, Tarsy CSIC ORCID | Fecha de publicación: | 1991 | Editor: | Elsevier | Citación: | Soil Biology and Biochemistry 23(9): 887-895 (1991) | Resumen: | The composition of the organic N fraction of the surface horizons of 16 widely differing temperate humid region soils, and of deeper horizons of four of these soils, was determined by a stepwise acid hydrolysis procedure. On average one-third of the organic N was very recalcitrant and accumulated in the unhydrolysable residue. Small proportions of the other two-thirds were successively extracted in the following four hydrolysis stages. More than half of the organic N was shared equally by 3-aminoacid and hydrolysable unidentified fractions, 6% was NH+4-N, 5% amide-N and 3% hexosamine-N. The results also indicated the existence of a labile organic N fraction, which was larger in soils with high organic C and N contents, and a recalcitrant fraction that increases with decreasing organic N. The relationship between extractable AI content and organic N was explained by an indirect mechanism which takes into account the biostability of organo-aluminium compounds. | Versión del editor: | https://doi.org/10.1016/0038-0717(91)90102-P | URI: | http://hdl.handle.net/10261/194758 | DOI: | 10.1016/0038-0717(91)90102-P | ISSN: | 0038-0717 |
Aparece en las colecciones: | (IIAG) Artículos |
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