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How affects the application of organic amendments to the richness of arbuscular mycorrhizal fungi in a trace element contaminated soil?

AutorMontiel Rozas, M. M.; López-García, A.; Kjoller, R.; Rosendahl, E.; Madejón, Engracia
Palabras claveContaminated soils
Arbuscular mycorrhizal fungi
Fecha de publicación2-dic-2014
CitaciónFirst Global Soil Biodiversity Conference - Assessing soil biodiversity and its role for ecosystem services 2-5 December 2014, Dijon, France
ResumenIn 1998 a toxic mine spill occurred in Aznalcóllar (Seville,Spain). Remediation works were carried out to remove the sludge from the surface of soil. However these tasks did not reduce the pollution until acceptable level. Afterwards, a study on the effect of organic amendments to restore the contaminated area has been conducted during 12 years. It comprises the use of two organic amendments: biosolid compost (BC) and leonardite (LE), a low grade coal rich in humic acids. Preliminary results showed differences in the restoration potential of the two amendments on soil properties. Next step includes the study of microbiological communities in the soil. Due to their important role for ecosystem functioning, the response of arbuscular mycorrhizal (AM) fungal communities has been studied in the treated soils. The AM fungal colonization of the two most abundant plant species in the experimental area :Lamarckia aurea (L.) Moench (Poaceae), and Chrysanthemum coronarium L., (Asteraceae), was investigated. C. coronarium roots showed a higher AM fungal colonization level whereas the concentration of trace elements (e.g. As, Cd, Cu, Zn ) incorporated in the aerial part of the plant was higher in L. aurea. Resulting from a subsequent molecular analysis of the AM fungal community colonizing the root of target plants, we expect to observe an increased diversity of AM fungi associated to C. coronarium and in the treatments using LE (the more effective amendment). Disentangling the contribution of AM fungal diversity to the survival and fitness of plant species in polluted areas can be valuable information when carrying out restoration programmes.
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