Banco de sementes com espécies nativas da caatinga.

Abstract

Seed bank with native species of the caatinga. Seed bank incubation studies provide information on species regeneration capacity and are important in determining conservation and conservation strategies. In the caatinga studies of this nature and with native species are still scarce. The objective of this research was to study the incubation of the seed bank of the Jucá (Libidibia ferrea (Mart. Ex Tul), Jurema Preta (Mimosa tenuiflora (Willd) Poiret) and Mulungu (Erythrina velutina Willd) seeds and to monitor the viability and vigor of the seeds during the period of 8 months in the soil. The incubation in the soil was done by packing the seeds in containers of sombrite screens, with knots that could be wounded according to the size of the seeds containing 100 seeds each. In the caatinga area under the canopy of the trees of the species under study, the containers were incubated in the soil, 5 cm deep after removal of the litter. A container was withdrawn, and the germination test was carried out. Results obtained determined that Mimosa tenuiflora remained viable, in the soil during the 8 months, and incubation favored the germination for this species. Libidibia ferrea presented viability loss after two months to (Matrix 1) and in one month for the (matrix 2) as well as Erythrina, when incubated in the soil, with high mortality due to intense predation in both species. The hypothesis tested was confirmed only for Mimosa tenuiflora.