Sucessão vegetal e atributos químicos do solo em uma área de empréstimo revegetada com leguminosas arbóreas estruturantes após 28 anos do plantio no estado do Rio de Janeiro

Abstract

The degradation of an area by land loan, as well as in the mining activity, removes the superficial horizons from the soil leaving it devoid of seed bank and fertile layers. Such an impact makes it impossible to recover the area without human intervention. For these aspects an area degraded by land loan was reforested with exotic tree legume seedlings inoculated with nitrogen fixing bacteria and arbuscular mycorrhizal fungi, and this work aims to evaluate the plant succession and soil chemical attributes after 28 years of planting . For this purpose, the floristic composition of the seed bank and the tree species in the regenerative and adult strata of the area in question were characterized, the soil fertility conditions were evaluated through chemical attributes and the biomass and nutrient stocks of the litter were evaluated in the dry period and rainy season, comparing all the results with a fragment of Atlantic Forest in secondary growth phase near the site. Revegetation with legumes activated the process of plant succession and provided the arrival of new plant species in the area. However, difficulties in the advance of plant succession can be attributed to the lack of connectivity with a conserved forest matrix. The planted species, although exotic, do not demonstrate to be negatively interfering in the plant succession. Canopy formation favored plant succession. Soil fertility potential has been restored at levels above that of the secondary forest used as a reference. The litter fall is a determinant source of nutrient input in the soil, highlighting the area revegetated mainly in the dry period of the year.