English   español  
Please use this identifier to cite or link to this item: http://hdl.handle.net/10261/22672
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 | DATACITE
Exportar a otros formatos:

Title

Land use and soil carbon accumulation patterns in South African

AuthorsAlmendros Martín, Gonzalo CSIC ORCID ; Zancada Fernández, M. Cristina  ; Pardo Fernández, María Teresa
KeywordsCarbon sequestration
Fungal melanins
Humic acid
Fulvic acid
Humin
Issue Date13-Jan-2005
PublisherSpringer
CitationBiology and Fertility of Soils 41: 173-181 (2005)
AbstractSoil organic matter (SOM) from representative South African savanna ecosystems (KwaZulu-Natal and Eastern Cape) was analysed to assess its potential for soil C sequestration and the impact of clearing and cultivation on humus characteristics. The different humic fractions and some structural features of the humic acid (HA) fraction were studied by visible and infrared (IR) derivative spectroscopies. Undisturbed soils showed low SOM accumulation (1–4 g kg−1) and this potential accumulation seemed to depend on soil moisture and plant cover rather than on slope and vegetation type. In general, clearing and cultivation lead to decreased C levels accompanied by oxidative breakdown of the SOM. We found that the most diagnostic chemical descriptors for the contrasted situations under study were the amount of perylenequinonic pigments in HAs (not found in cultivated soils), the concentration of fulvic acids (FAs) extracted from soil with 2 M H3PO4 (significantly lower in soils with a pronounced slope) and the proportion of humic substances linked to clay and oxides which—like the HA/FA ratio—suggested an increased degree of association between SOM and mineral colloids in soils with low or no protection by forest canopy (open, dry savanna, cleared areas). Our results suggest a primary environmental control of the SOM turnover (affected by warm temperature, intense sunlight radiation and rain events) with an important secondary role of topographical and human disturbance factors. The interest of assessing SOM quality rather than its total concentration in soil is underlined.
Description9 pages, figures and tables statistics.
Publisher version (URL)http://dx.doi.org/10.1007/s00374-004-0823-6
URIhttp://hdl.handle.net/10261/22672
DOIhttp://dx.doi.org/10.1007/s00374-004-0823-6
ISSN0178-2762
Appears in Collections:(IRN) Artículos
Files in This Item:
File Description SizeFormat 
accesoRestringido.pdf15,38 kBAdobe PDFThumbnail
View/Open
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.