Gramíneas nativas da Floresta Nacional de Carajás para recuperação de taludes de pilhas estéreis de mineração

Abstract

Among the various riches of the Carajás National Forest, extensive ferruginous mountain ranges stand out, characterized by plant formations known as ferruginous rupestrian fields, associated with a substrate rich in iron, a product of soil laterization. In view of this, they are environments that are home to one of the largest mineral reserves of high iron content on the planet. All areas altered in the FN of Carajas due to mining are subject to compensation, prevention, mitigation and recovery procedures for the damage caused. The objective of this work was to evaluate the use of native grasses from the Carajas National Forest for recovery of the slopes of mining waste piles. The work took place at the “N1” iron mine, owned by the company VALE S.A, located in the Carajás National Forest, where the native grasses Paspalum foliiforme and Paspalum cinerascens were implanted in a cut area of ​​the slope of a mining overburden pile. Data collection took place from January 16 to 18, 2023, and data were obtained on the following evaluation parameters: plant height, chlorophyll content and number of stems and leaves. There was no significant difference for the average height between the species, but there was a significant difference for the average stems, leaves, and in chlorophyll content. It is concluded that in unfavorable conditions the use of these grasses is viable, however, P. cinerascens showed better adaptability and development compared to P. foliiforme in degraded areas of mining waste piles.