QUALIDADE DE SOLO E LITEIRA EM VEGETAÇÃO PÓS MINERAÇÃO E FRAGMENTO FLORESTAL EM CAPITÃO POÇO, PARÁ, BRASIL

The present study aimed to evaluate some chemical and physical attributes of the soil, as well as the litter accumulated above ground in two areas at different fallow times after pebble and sand exploration, compared to a secondary forest. The study was carried out in the municipality of Capitão Poço, Pará, Brazil. Each study area has about 5 ha. The three areas are composed of a forest fragment (FOR), a mined area with fallow of 48 months (DA48) and an area mined in a period of 18 months (DA18). The variables analyzed were soil density, soil particle density, soil fertility and litter physical quality. FOR obtained higher values ​​of litter biomass in almost all factors analyzed. Just the water holding capacity of the litter in this area together with the weight of the fresh straw. In general, it was observed that it is more appropriate to use the fallow observed in the DA18 area for intervention through recovery practices to take advantage of natural regeneration.
O presente estudo teve como objetivo avaliar alguns atributos químicos e físicos do solo, bem como a serapilheira acumulada acima do solo em duas áreas em diferentes épocas de pousio após a exploração de seixo e areia, em comparação com uma floresta secundária. O estudo foi realizado no município de Capitão Poço, Pará, Brasil. Cada área de estudo possui cerca de 5 ha. As três áreas são compostas por um fragmento florestal (FOR), uma área minerada com pousio de 48 meses (DA48) e uma área minerada em um período de 18 meses (DA18). As variáveis analisadas foram densidade do solo, densidade de partículas do solo, fertilidade do solo e qualidade física da serapilheira. FOR obteve maiores valores de biomassa de serapilheira em quase todos os fatores analisados. Apenas a capacidade de retenção de água da liteira desta área juntamente com o peso da palha fresca. De modo geral, observou-se que é mais adequado utilizar o pousio observado na área DA18 para intervenção por meio de práticas de recuperação para aproveitar a regeneração natural. Palavras-chave: solos degradados; biomassa vegetal; ecossistemas; recuperação de áreas degradadas; exploração de seixo de areia. Soil and litter quality under post mining vegetation and forestry fragment in Capitão Poço, Pará, Brazil ABSTRACT: The present study aimed to evaluate some chemical and physical attributes of the soil, as well as the litter accumulated above ground in two areas at different fallow times after pebble and sand exploration, compared to a secondary forest. The study was carried out in the municipality of Capitão Poço, Pará, Brazil. Each study area has about 5 ha. The three areas are composed of a forest fragment (FOR), a mined area with fallow of 48 months (DA48) and an area mined in a period of 18 months (DA18). The variables analyzed were soil density, soil particle density, soil fertility and litter physical quality. FOR obtained higher values ​​of litter biomass in almost all factors analyzed. Just the water holding capacity of the litter in this area together with the weight of the fresh straw. In general, it was observed that it is more appropriate to use the fallow observed in the DA18 area for intervention through recovery practices to take advantage of natural regeneration. Keywords: degraded soils; vegetal biomass; ecosystem; recovery of degraded lands; pebble and sand exploitation.