%0 Journal Article
%T Labile carbon pools and biological activity in volcanic soils of the Canary Islands Fracciones de carbono org¨¢nico l¨¢bil y actividad biol¨®gica en suelos de origen volc¨¢nico de las Islas Canarias Fra  es de carbono organico l¨¢bil e actividade biol¨®gica em solos de origem vulcanica das Ilhas Can¨¢rias
%A Cecilia Mar¨ªa Armas Herrera
%A Juan Luis Mora Hern¨¢ndez
%A Carmen Dolores Arbelo Rodr¨ªguez
%A Antonio Rodr¨ªguez Rodr¨ªguez
%J Spanish Journal of Soil Science
%D 2013
%I Universia
%R null
%X It is important to assess the mineralisation of soil organic carbon (SOC) to predict the short-term response of biosphere carbon reservoirs to changing environmental conditions. We investigated the labile (easily-mineralisable) SOC in volcanic soils, where the bioavailability of SOC is typically affected by physico-chemical stabilisation mechanisms that are characteristic of these soils. Ten soils were selected that represent the most typical soil types (mainly Andosols) and natural habitats (xerophytic scrubland, laurel forest and pine forest) in the Canary Islands, a volcanic archipelago. Over two years we measured several physico-chemical SOC fractions with different degrees of bioavailability: water-soluble carbon in fresh soil samples (WSC) and in the saturated extract (WSCse), hot water-extractable carbon (HWC), potassium sulphate-extractable carbon (PSC), microbial biomass carbon (MBC), particulate organic carbon (POC), humic substances carbon (HSC), and total organic carbon (TOC), and performed CO2 emission incubation assays. We related these measurements to the potential C inputs of plant litter and roots and to the activity of certain hydrolytic enzymes (CM-cellulase, ?-D-glucosidase, and dehydrogenase) that are involved in carbon turnover. In vitro carbon mineralisation measurements from short assays (ten days) were fitted with simple first-order kinetics to investigate SOC. This procedure was simple and allowed us to obtain estimates both for potentially mineralisable SOC and for the heterogeneity of the substrates that were consumed during incubation. The investigated volcanic soils had large labile SOC concentrations in which simple carbohydrates predominated and that were mainly derived from roots and aboveground non-woody residues. Among the analysed physico-chemical SOC fractions, HWC (3.1 g kg-1 on average at 0-30 cm depth in Andosols) was the most correlated with C0 (1.2 g kg-1) and therefore best represents potentially mineralisable SOC. PSC (0.77 g kg-1), which represents an SOC pool of low bioavailability, was protected by its adsorption to allophane in silandic Andosols. La medida de la susceptibilidad del carbono org¨¢nico del suelo (SOC) a la mineralizaci¨®n es esencial para predecir la respuesta a corto plazo de los reservorios biosf¨¦ricos de carbono a los cambios en las condiciones ambientales. En este trabajo abordamos el estudio del SOC l¨¢bil (f¨¢cilmente mineralizable) en suelos volc¨¢nicos, donde la biodisponibilidad del SOC se ve caracter¨ªsticamente afectada por mecanismos de estabilizaci¨®n f¨ªsico-qu¨ªmica propios de estos suel
%K Andosols
%K SOC fractionation
%K mineralisation kinetics
%K soil enzymatic activity
%K natural ecosystems
%K Andosoles
%K fraccionamiento de SOC
%K cin¨¦tica de mineralizaci¨®n
%K actividad enzim¨¢tica del suelo
%K ecosistemas naturales
%K Andossolos
%K fraccionamento do SOC
%K cin¨¦tica de mineraliza  o
%K actividade enzim¨¢tica
%K ecossistemas naturais
%U http://sjss.universia.net/pdfs_revistas/articulo_291_1363339624806.pdf