English   español  
Please use this identifier to cite or link to this item: http://hdl.handle.net/10261/59127
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 | DATACITE
Exportar a otros formatos:


Pyrolytic descriptors responsive to changes in humic acid characteristics after long-term sustainable management of dryland farming systems in Central Spain

AuthorsDorado, José CSIC ORCID ; González-Vila, Francisco Javier CSIC ORCID ; Zancada Fernández, M. Cristina  ; Almendros Martín, Gonzalo CSIC ORCID ; López-Fando, Cristina CSIC
KeywordsAgricultural systems
Sustainable practices
Organic amendments
Crop residues
Curie-point pyrolysis
Issue DateAug-2003
CitationJournal of Analytical and Applied Pyrolysis: 68-69 (2003)
AbstractStructural changes in humic acids from a semiarid soil of an experimental farm in Central Spain have been studied by Curie-point pyrolysis. Soil has received periodic inputs of farmyard manure or crop wastes for the last 16 years, and mineral nitrogen fertilisation in 50% of the plots. Analytical pyrolysis suggested substantial differences in terms of the effect of soil management on the accumulation mechanisms of the humic acid fraction. When compared with control plots, humic acids from plots amended with crop wastes displayed well defined methoxyphenol assemblages, indicating that the diagenetic transformation of lignin could be a dominant mechanism of organic matter stabilisation. The greatest yields of methoxyphenols after organic inputs were obtained in plots receiving nitrogen fertilisation, what agrees with the expected higher performance of the lignin biodegradation in nitrogen limited media. Increased yields of lignin derived methoxyphenols were also observed in plots treated with manure, which released in addition a conspicuous series of alkyl compounds suggesting recalcitrant wax derived lipids incorporated to the humicacids. Highest yields of pyrolytic fatty acids were observed in humicacids from manure amended plots without nitrogen fertilisation. Alkylbenzene proportions were also pyrolytic descriptors responsive to mineral nitrogen inputs, showing very significant differences (P<0.01) in both control and amended plots. Results suggested that continued organic inputs can not be considered to increase soil organic matter quality, since microbial reworking of lignins became the dominant mechanism of accumulation of humicacid type substances, even when nitrogen inputs were applied.
Description16 pages, 5 figures, 2 tables, 44 tables.-- Pyrolysis 2002 Conference issue.
Publisher version (URL)http://dx.doi.org/10.1016/S0165-2370(03)00057-3
Appears in Collections:(IRNAS) Artículos
(CCMA) Artículos
Files in This Item:
File Description SizeFormat 
Pyrolytic descriptors.pdf248,66 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.