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Microbial processes in the rhizosphere soil of a heavy metals-contaminated Mediterranean salt marsh: A facilitating role of AM fungi

AutorCarrasco Blázquez, Lucía ; Caravaca Ballester, María Fuensanta ; Álvarez-Rogel, José; Roldán Garrigos, Antonio
Palabras claveEnzyme activities
Heavy metal
Arbuscular mycorrhizal fungi
Mining waste
Salt marsh
Fecha de publicaciónjun-2006
CitaciónChemosphere 64(1): 104-111 (2006)
ResumenWe investigated the relationship of the zonal pattern followed by the vegetation in a polluted Mediterranean salt marsh, in semiarid south-eastern Spain, with the microbiological and biochemical properties (labile C fractions, oxidoreductases and hydrolases) of the rhizosphere soil of two halophyte species, Arthrocnemum macrostachyum and Sarcocornia fruticosa, and with the degree of arbuscular mycorrhizal (AM) colonisation in their rhizospheres. Levels of plant biomass and cover were inversely related to heavy metal contents and salinity. The concentrations of Fe, Cu, Mn and Pb extracted with DTPA hardly varied among the different zones of the salt marsh. The dehydrogenase and phosphatase activities, the soluble C and water-soluble carbohydrates concentrations and the extent of root colonisation were greater in the salt marsh zones of lower soil salinity and lower metal concentration. Urease and β-glucosidase activities were not detected in the salt marsh. Plant biomass and cover showed positive relationships with mycorrhizal colonisation (R = 0.773, P < 0.001; R = 0.874, P < 0.001, respectively). Mycorrhizal colonisation was negatively correlated with the contents of Pb and Zn in plant tissues. This work supports the view that reduced plant uptake of toxic metals, particularly lead, could be involved in the beneficial effects of AM fungi on plant development in Mediterranean salt marshes contaminated with mining wastes.
Descripción8 pages, 6 tables.
Versión del editorhttp://dx.doi.org/10.1016/j.chemosphere.2005.11.038
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