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  PRELIMINARY COMPARATIVE STUDY OF TWO METHODS OF DEGRADED AREAS RECOVERY USED IN DESIGN OF BAUXITE MINE PARAGOMINAS, PARÁ / BR
16/09/2011

ANDREAS KIEKEBUSCH
ES - GUARAPARI
Avaliação de diferentes técnicas para recuperação ambiental de áreas mineradas no bioma amazônico apresentado no congresso internacional MineClosure 2010 realizado em Vinã Del Mar, Chile.

Área(s) de Atuação que o Presente Artigo trata
Biologia
Meio Ambiente e Biodiversidade
Gestão Ambiental
Restauração/Recuperação de Áreas Degradadas e Contaminadas


The Paragominas Bauxite Mine Project went into operation in the second half of 2007 and is located in the municipality of Paragominas, northwestern state of Para, in Amazon Biome, an area of 18,846.67 ha in the Plateaus Miltonia 3 and Miltonia 5.

The mining process occurs in strips in 550 ha/year following the process vegetation removal, removal and storage of organic soil, sterile material withdrawal, removal of the mineral (bauxite), closure of the pit, topographic reconformation and reclamation of degraded areas.

The recovery of mined areas following two different methodologies: the first consists in planting native species and the second occurs by natural regeneration seeking restore the areas in the shortest possible time, and so, reducing erosion processes, restoring the stability, rebuilding the soil and the biological processes so that all the elements contribute to the maintenance with the wildlife from the local population and reconduce the ecological process in the fasted time possible.

Between the years 2009/2010 they`re recovered 171.77 ha with reforestation using 1.111 native species seedings/ha and 33.76 ha with natural regeneration as an experiment aiming to define the methodology that best fits the needs of the project.

In order to assess the ecosystem restoration dynamics are carried out twice a year, monitoring activities in the recovery areas and comparative analysis between the two methodologies aiming to evaluate the vegetative growth, the

diversity of species and the establishment of standards that allow the decision of which technique to be adopted that result in cost savings and accelerating the process of soil cover.

The wildlife monitoring complementing the information about the environmental quality from the recovered areas, the ecological corridors and the preservation areas, in order to offers a complete date bank of the environmental health from Paragominas Bauxite Mine Project.

The collector`s curve (or cumulative number of species between samples), indicated that natural regeneration areas tend to have an increased number of species over time, unlike the reforestation areas that rely solely with the species planted and did not present any ecological succession in your area, possibly by altering the quality of soil, per increment of chemical fertilizers, incorporated elements that limit the establishment of a native flora population.

The preliminary observations indicate that, if considering the variables cost / time of land cover / diversity, possibly the technique of natural regeneration associated with an increase of noble species will enable a rapid response with the expected quality and with a significant cost reduction, contributing with the environmental maintence and resulting, in a short time in a complete recovery of all the original caracterists.


ANDREAS KIEKEBUSCH
ES - GUARAPARI

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