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- Title
Limitations to Use of Cassia grandis L. in the Revegetation of the Areas Impacted with Mining Tailings from Fundão Dam.
- Authors
de Matos, Letícia Paiva; de Andrade, Heloísa Monteiro; Marinato, Claudio Sergio; de Oliveira Prado, Isabelle Gonçalves; Coelho, Daniel Gomes; Montoya, Sebastián Giraldo; Kasuya, Maria Catarina Megumi; de Oliveira, Juraci Alves
- Abstract
Revegetation is an alternative of recovery for contaminated areas by mining tailings. The objective of this study was to evaluate the physiological responses of Cassia grandis growing in iron mining tailings and the implications for revegetation purposes. Plants of C. grandis were grown for 4 months in substrate collected in affected areas by residues from Fundão dam, and commercial substrate was used as control. Metal(loid)s contents, antioxidant enzymatic activity, gas exchanges, and chloroplast pigments contents were analyzed. Arsenic, cadmium, and lead were not detected in plant tissues. On the other hand, there were increases in the contents of some elements, such as iron and chromium, with marked reduction in the phosphate inorganic levels in plants cultivated with mining tailings compared to the control. The exposure to mining tailings increased the antioxidant enzymes activity and anthocyanins contents, whereas decreased chlorophyll a, b and carotenoid contents. The increase of enzymatic activity may be related to the increased concentration of toxic elements such as chromium. The photosynthetic rate, stomatal conductance, transpiration, and water use efficiency have been reduced which is probably associated with the limitations of water availability caused by the high compaction of mining tailings. These physical limitations also may have caused deformations observed in the main roots of tailings-grown plants. Our results indicate that the cultivation of C. grandis in mining tailings imposes some physiological damage. Nevertheless, this plant species has the potential to establish and develop at locations affected by iron ore tailings with properly management.
- Subjects
REVEGETATION; IRON mining; WATER efficiency; CASSIA (Genus); CAROTENOIDS; PLANT pigments; TAILS; WATER supply
- Publication
Water, Air & Soil Pollution, 2020, Vol 231, Issue 3, p1
- ISSN
0049-6979
- Publication type
Article
- DOI
10.1007/s11270-020-04479-0