English   español  
Please use this identifier to cite or link to this item: http://hdl.handle.net/10261/57771
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:


Wetland soil organic matter composition in a Mediterranean semiarid wetland (Las Tablas de Daimiel, Central Spain): Insight into different carbon sequestration pathways

AuthorsRodríguez Murillo, Juan Carlos ; Almendros Martín, Gonzalo ; Knicker, Heike
Issue Date2011
PublisherPergamon Press
CitationOrganic Geochemistry 42(7): 762- 773 (2011)
AbstractWetland soils from a Mediterranean semiarid wetland (Las Tablas de Daimiel, Central Spain) were studied to characterize the organic matter (OM) and determine its origin and transformation. Cross polarization magic angle spinning (CPMAS) 13C nuclear magnetic resonance (NMR) spectroscopy and mathematical molecular mixing allowed analysis of the organic fraction in terms of six generic components (carbohydrate, protein, lignin, lipid, char and > carbonyl> ). Las Tablas is an active carbon sink, with total organic carbon (TOC) content independent of soil OM quality; the TOC content of the upper sediment is 10.0±7.8%. The inorganic carbon content is also high (5.4±3.3%) and is associated mainly with OM of aliphatic character. The OM composition is variable; samples predominantly aliphatic (carbohydrate, lipid and protein) are characteristic of the northern sector, whereas predominantly aromatic samples are typical of the southern Tablas. A strong negative relationship between protein content and lignin content was found, interpreted as a consequence of different proportions of vascular vs. non-vascular (mostly charophyte) litter input. The effect of perturbation is apparent in the extended presence of char, particularly abundant in fire-prone areas. OM quantity and quality do not seem to depend on hydrology (although seasonal flooding is associated with lower TOC wetland soils) or soil characteristics. Dominant vegetation and fire are the main drivers of OM content and composition. Structural carbohydrate, protein and lipid (>60% of total organic fraction) dominate. Widespread anaerobic conditions and the recent character of the sediments could explain the preservation of different fractions of the original detritus composition (due to different vegetation and presence of microbes).
Description12 pages, 7 figures, 10 tables, 62 references.
Publisher version (URL)http://dx.doi.org/10.1016/j.orggeochem.2011.05.007
Identifiersdoi: 10.1016/j.orggeochem.2011.05.007
issn: 0146-6380
Appears in Collections:(IRNAS) Artículos
Files in This Item:
File Description SizeFormat 
Wetland soil organic matter composition in a Mediterranean.pdf2,47 MBAdobe 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.