English   español  
Please use this identifier to cite or link to this item: http://hdl.handle.net/10261/211770
Share/Impact:
Statistics
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:

Title

Effect of a wildfire and of post-fire restoration actions in the organic matter structure in soil fractions

AuthorsJiménez Morillo, N. T. ; Almendros Martín, Gonzalo ; Rosa Arranz, José M. de la ; Jordán, A.; Zavala, Lorena M.; Granged, Arturo J.P.; González-Pérez, José Antonio
KeywordsAnalytical pyrolysis
Chemometrics
Soil organic matter
Soil rehabilitation
Wildfires
Issue Date1-Aug-2020
PublisherElsevier
CitationScience of the Total Environment 728: 138715 (2020)
AbstractThe impact of wildfires and of restoration actions on soil organic matter (SOM) content and structure was studied in a soil under pine (Pinus pinea) from Doñana National Park (SW Spain). Samples were collected from burnt areas before (B) and after post-fire restoration (BR) and compared with an unburnt (UB) site. Analytical pyrolysis (Py-GC/MS) was used to investigate SOM molecular composition in whole soil samples and in coarse (CF) and fine (FF) fractions. The results were interpreted using a van Krevelen graphical-statistical method. Highest total organic carbon (TOC) was found in UB soil and no differences were found between B and BR soils. The CF had the highest TOC values and FF presented differences among the three scenarios. Respect to SOM structure, the B soil was depleted in lignin and enriched in unspecific aromatics and polycyclic aromatic hydrocarbons, and in all scenarios, CF SOM consisted mainly of lignocellulose derived compounds and fatty acids. In general, FF SOM was found more altered than CF. High contribution of unspecific aromatic compounds and polycyclic aromatic hydrocarbons was observed in B-FF whereas BR-FF samples comprised considerable proportions of compounds from labile biomass, possibly due to soil mixing during rehabilitation actions. The fire caused a defunctionalisation of lignin-derived phenolics and the formation of pyrogenic compounds. The van Krevelen diagram was found useful to—at first sight—differentiate between chemical processes caused by fire and of the rehabilitation actions. Fire exerted SOM demethoxylation, dealkylation and dehydration. Our results indicate that soil management actions after the fire lead to an increase in aromaticity corresponding to the accumulation of lignin and polycyclic aromatic compounds. This suggests additional inputs from charred lignocellulosic biomass, including black carbon, that was incorporated into the soil during rehabilitation practices. © 2020 Elsevier B.V.
Publisher version (URL)http://dx.doi.org/10.1016/j.scitotenv.2020.138715
URIhttp://hdl.handle.net/10261/211770
DOI10.1016/j.scitotenv.2020.138715
ISSN0048-9697
Appears in Collections:(IRNAS) Artículos
Files in This Item:
File Description SizeFormat 
Effect_wildfire_post_fire_restoration_action_organic_matter_2020_Postprint.pdf Embargoed until August 1, 20221,19 MBAdobe PDFThumbnail
View/Open    Request a copy
Show full item record
Review this work
 


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