Selective uptake of major and trace elements in Erica andevalensis, an endemic species to extreme habitats in the Iberian Pyrite Belt
Selective uptake of major and trace elements in Erica andevalensis, an endemic species to extreme habitats in the Iberian Pyrite Belt
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DOI：
10.1016/s1001-0742(10)60429-9
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发表时间：
2011-01-01
影响因子：
6.9
通讯作者：
Bargagli, Roberto
中科院分区：
文献类型：
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作者：
Monaci, Fabrizio;Leidi, Eduardo O.;Bargagli, Roberto
为了评估特有石南花埃里卡和瓦伦西斯的生态生理特征和植物修复潜力，我们测定了里奥廷托矿区（西班牙韦尔瓦）不同植物部位和根际土壤中主量元素和微量元素的浓度。结果表明，E. andevalensis 可以在 As、Cu、Fe 和 Pb 浓度非常高（分别高达 4114、1050、71900 和 15614 mu g/g 干重）、常量和微量营养素利用率非常低且 pH 值范围为 3.3 至 4.9 的基质上生长。在这些恶劣的土壤条件下，安德瓦兰有选择地吸收和转移必需的营养物质，并排除在根表皮中积累的潜在植物毒性元素。 Riotinto矿区的E. andevalensis地上部分的主量元素和微量元素浓度处于植物的正常范围内；与其他埃里卡物种一样，它积累了锰，并且仅在污染严重的地点，我们测量了叶片中砷和铅的浓度，在植物过量或有毒的限度内。与以往的研究强调土壤pH值和植物毒性元素的生物有效性作为主要胁迫因素不同，本研究表明，在Riotinto地区，E. andevalensis可以耐受较宽的pH值和有毒元素浓度范围；该物种的单一特异性斑块所居住的最恶劣环境的特点是营养物质的可用性非常低。适应这些极端栖息地的非凡能力使 E. andevalensis 成为促进 Riotinto 尾矿上植物稳定和自我维持植被覆盖发展的优先物种。
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 15614 mu g/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.