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Universidad Politécnica de Cartagena (2018)

Estudio de los factores edáficos implicados en la absorción de metales/metaloides por Atriplex halimus en residuos mineros

Perez Guerrero, Vilcky Esther

Titre : Estudio de los factores edáficos implicados en la absorción de metales/metaloides por Atriplex halimus en residuos mineros

Auteur : Perez Guerrero, Vilcky Esther

Université de soutenance : Universidad Politécnica de Cartagena

Grade : Master en Ciencia y Tecnología del Agua y del Terreno 2018

Résumé
The accumulations of abandoned mining wastes present environmental and public health risks due to the potential transfer of toxic elements through water and wind erosion or leaching. One strategy to reclaim those areas is the use of phytotechnologies. One of the species best adapted to the soils developed over the tailings ponds is Atriplex halimus. This species is able to easily colonize the surface of the tailings ponds and develop high biomass, but it can also accumulate metals in their aerial tissues. The main objectives of this study were : to assess the ability of A. halimus to change soil physicochemical properties and metals availability when is present, its capability of uptaking metals, and the effect of soil physicochemical on the availability of A. halimus to uptake metals, The evolution of different soil properties, different metal fractions and their metals absorption by A. halimus was monitored. For this purpose, we sampled rhizospheric soil, non rhizospheric soil and plant tissues from four different tailings ponds. Results showed that A. halimus, have an accumulation capacity of metals with a high significant accumulation in leaves, followed by stems. No physicochemical property showed significant differences between soil types (rhizhospheric and non-rhizospheric) indicating that the development of A. halimus did not influence these properties in any of the tailings ponds. Therefore, the development and capacity of A. halimus are related to the physicochemical properties in each deposit, showing significant differences between the tailings ponds.

Mots Clés  : metals ; tailings ; phytoremediation ; Atriplex halimus ; rhizosphere

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Page publiée le 13 février 2019