Selective uptake of major and trace elements in Erica andevalensis,an endemic species to extreme habitats in the Iberian Pyrite Belt  

作　　者：Fabrizio Monaci Eduardo O.Leidi Maria Dolores Mingorance Benito Valdés Sabina Rossini Oliva Roberto Bargagli 

机构地区：[1]Department of Environmental Sciences"G.Sarfatti",University of Siena Via P.A.Mattioli,4,Siena 53100,Italy [2]Department of Plant Biotechnology,IRNAS-CSIC,Avda.Reina Mercedes,10,Sevilla 41012,Spain [3]Andalusian Institute of Earth Science,CSIC-UGR,Prof.Albareda,1,Granada 18008,Spain [4]Deparment of Plant Biology and Ecology,University of Seville,Avda.Reina Mercedes s/n,Apartado de Correo 1095,Sevilla 41080,Spain

出　　处：《Journal of Environmental Sciences》2011年第3期444-452,共9页环境科学学报（英文版）

基　　金：supported by the MICINN (No.CGL2006/02860) and Fundación Areces

摘　　要：To assess the ecophysiological traits and the phytoremediation potential of the endemic heather Erica andevalensis, we determined the concentrations of major and trace elements in different plant parts and in rizosphere soils from Riotinto mining district （Huelva, Spain）. The results showed that E. andevalensis may grow on substrates with very high As, Cu, Fe and Pb concentrations （up to 4114, 1050, 71900 and 15614μg/g dry weight, respectively）, very low availability of macro- and micronutrients and with pH values ranging from 3.3 to 4.9. In these harsh edaphic conditions E. andevalensis selectively absorbed and translocated essential nutrients and excludes potentially phytotoxic elements, which were accumulated in the root epidermis. The concentrations of major and trace elements in E. andevalensis aerial parts from the Riotinto mining district were in the normal range for plants; likewise other Erica species it accumulated Mn and only in a very polluted site we measured leaf concentrations of As and Pb within the excessive or toxic limits for plants. Differently from previous studies, which emphasized the soil pH and bioavailability of phytotoxic elements as the main stress factors, this study showed that in the Riotinto region, E. andevalensis can tolerate wide range of pH and toxic element concentrations; the harshest environments colonized by monospecific patches of this species were characterized above all by very low availability of nutrients. The extraordinary capability to adapt to these extreme habitats made E. andevalensis a priority species to promote the phytostabilization and the development of a self-sustaining vegetative cover on Riotinto mine tailings.To assess the ecophysiological traits and the phytoremediation potential of the endemic heather Erica andevalensis, we determined the concentrations of major and trace elements in different plant parts and in rizosphere soils from Riotinto mining district （Huelva, Spain）. The results showed that E. andevalensis may grow on substrates with very high As, Cu, Fe and Pb concentrations （up to 4114, 1050, 71900 and 15614μg/g dry weight, respectively）, very low availability of macro- and micronutrients and with pH values ranging from 3.3 to 4.9. In these harsh edaphic conditions E. andevalensis selectively absorbed and translocated essential nutrients and excludes potentially phytotoxic elements, which were accumulated in the root epidermis. The concentrations of major and trace elements in E. andevalensis aerial parts from the Riotinto mining district were in the normal range for plants; likewise other Erica species it accumulated Mn and only in a very polluted site we measured leaf concentrations of As and Pb within the excessive or toxic limits for plants. Differently from previous studies, which emphasized the soil pH and bioavailability of phytotoxic elements as the main stress factors, this study showed that in the Riotinto region, E. andevalensis can tolerate wide range of pH and toxic element concentrations; the harshest environments colonized by monospecific patches of this species were characterized above all by very low availability of nutrients. The extraordinary capability to adapt to these extreme habitats made E. andevalensis a priority species to promote the phytostabilization and the development of a self-sustaining vegetative cover on Riotinto mine tailings.

关 键 词：mine tailing Riotinto tolerant plants Erica andevalensis rhizosphere soils 

分 类 号：X173[环境科学与工程—环境科学]