Behavior of Eucalyptus grandis and E. cloeziana seedlings grown in arsenic-contaminated soil

Revista Brasileira de Ciência do Solo

Roseli Freire Melo²  Luiz Eduardo Dias¹  Jaime Wilson Vargas De Mello¹  Juraci Alves Oliveira¹ 

[1] ,EMBRAPA Agric. Res. Center Petrolina PE ,Brazil

关键词: phytoremediation;    arsenate;    phytotoxicity;    fitorremediação;    arsenato;    fitotoxidez;   

DOI  :  10.1590/S0100-06832010000300040

来源: SciELO

【 摘 要 】

Arsenic has been considered the most poisonous inorganic soil pollutant to living creatures. For this reason, the interest in phytoremediation species has been increasing in the last years. Particularly for the State of Minas Gerais, where areas of former mining activities are prone to the occurrence of acid drainage, the demand is great for suitable species to be used in the revegetation and "cleaning" of As-polluted areas. This study was carried out to evaluate the potential of seedlings of Eucalyptus grandis (Hill) Maiden and E. cloeziana F. Muell, for phytoremediation of As-polluted soils. Soil samples were incubated for a period of 15 days with different As (Na2HAsO4) doses (0, 50, 100, 200, and 400 mg dm-3). After 30 days of exposure the basal leaves of E. cloeziana plants exhibited purple spots with interveinal chlorosis, followed by necrosis and death of the apical bud at the 400 mg dm-3 dose. Increasing As doses in the soil reduced root and shoot dry matter, plant height and diameter in both species, although the reduction was more pronounced in E. cloeziana plants. In both species, As concentrations were highest in the root system; the highest root concentration was found in E. cloeziana plants (305.7 mg kg-1) resulting from a dose of 400 mg dm-3. The highest As accumulation was observed in E. grandis plants, which was confirmed as a species with potential for As phytoextraction, tending to accumulate As in the root system and stem.

【 授权许可】

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