Labile carbon pools and biological activity in volcanic soils of the Canary Islands
- Cecilia María Armas Herrera
- J. L. Mora
- Carmen Dolores Arbelo Rodríguez
- Antonio Rodríguez Rodríguez
ISSN: 2253-6574
Datum der Publikation: 2013
Ausgabe: 3
Nummer: 1
Seiten: 7-27
Art: Artikel
Andere Publikationen in: Spanish Journal of Soil Science: SJSS
Indikatoren
SCImago Journal Rank
- Jahr 2013
- Impact SJR der Zeitschrift: 0.134
- Höchstes Quartil: Q4
- Bereich: Soil Science Quartil: Q4 Position im Bereich: 102/126
Scopus CiteScore
- Jahr 2013
- CiteScore der Zeitschrift: 0.8
- Bereich: Soil Science Perzentil: 29
Zusammenfassung
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, â-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.