BIOCHEMICAL ATTRIBUTES AND ESTABLISHMENT OF TREE SEEDLINGS IN SOIL AFTER DEPOSITION OF IRON MINING RESIDUES

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Jessé Valentim dos Santos
http://orcid.org/0000-0003-4757-2658
Alexandre Carvalho Ribeiro Junior
http://orcid.org/0000-0002-1465-5118
Aline Oliveira Silva
http://orcid.org/0000-0003-0317-4797
Éder Rodrigues Batista
http://orcid.org/0000-0003-3904-7749
Filipe Sales Naves
http://orcid.org/0000-0002-0659-4431
Flávio Araújo Pinto
http://orcid.org/0000-0003-2695-4796
Marisângela Viana Barbosa
http://orcid.org/0000-0003-3220-3243
Ingrid Fernanda Santana Alvarenga
http://orcid.org/0000-0001-6340-5150
Marco Aurélio Carbone Carneiro
http://orcid.org/0000-0003-4349-3071

Abstract

The recovery of areas impacted by mining activities is a major challenge and requires knowledge of how the biological and biochemical processes of the soil as well as the establishment of plant species are affected by mining residue. In this work, the influence of deposition of iron mining mud and tailings on soil biochemical attributes and the initial development of tree seedlings was studied in a simulated event in the greenhouse. Pots (n = 27) with natural soil (2.0 kg) received deposition (280 mL) of iron mining mud or tailings and by three-month was cultivated with Urochloa decumbens. At the end of this period, part of the pots was sampled and the soil biochemical activities (basal soil respiration, microbial biomass carbon, enzyme activity β-glucosidase, quantification of easily extractable glomalin) were evaluated. Then tree seedlings (Schinus terebinthifolius and Eremanthus incanus) were planted and cultivated for a year, when then shoot (SDW) and roots (RDW) dry weight were evaluated. The mud deposition reduced (p < 0.05) the SDM of E. incanus. The deposition of iron mining mud and tailings affected negatively (p < 0.05) the β-glucosidase and reduced in 19% the easily extractable glomalin. Nevertheless, Uruchloa decumbens and Eremanthus incanus showed no variation in dry weight production between treatments, showing good establishment capacity in soil affected by mining residue.

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