Uso da semeadura direta sob diferentes níveis de sombreamento na facilitação da colonização inicial de áreas degradadas

Abstract

The direct seeding technique is favorable to the ecological restoration of the remaining degraded forests. However, improvement is needed for each degree of degradation, taking into account the dynamics of forest recovery in terms of light intensity and competition with invasive exotic grasses. The objective of this study was to evaluate the use of direct seeding of forest species at different levels of shading, in areas infested by invasive exotic grasses. The experiment was in design completely randomized design (DIC), formed by the interaction between three densities of seeds (5, 10 and 15 uni), three topsoil depths (0, 10 and 20 cm) and three levels of shading (0%, 50% and 70%). The seeds were discarded in sowing lines (linear furrow) of 2 m of length, 50 cm wide and 5-20 mm deep (depending on the size of the seeds), spaced apart, with three replications for each treatment. For to evaluate the colonization of the area, counts of the sowing objects were made. Direct at 90, 120, 150, 180 and 270 days, after sowing. It was also evaluated the initial development of the species by measuring diameter and height of each individual. an analysis. The statistic used was the Non-Metric Multidimensional Scaling (NMDS). to test the. Difference between treatments for responses, MANOVA was used. in all 12,960 seeds were sown at a density of 25.92 seeds/m2, these, emerged 10.9% (1,418,83) at a density of 2 seeds/m two. The extent in the abundance of emerging species can be explained by shading and topsoil use. make total of. Emerged, there was a mortality of 449 seedlings (1.30%) during the period of Note. Topsoil, however, is necessary for seed emergence. studies to better define arrangements with small seeds to be more successful with emergence, as some species are useful for the initial process of colonization by the Growth and establishment, such as the species Guazuma ulmifolia Lam. and Schinus terebentifolius Raddi. The initial shading favored the emergence and establishment of the methods seeking, however, it is necessary to adapt means of minimum costs for implementation.