Caracterização do banco de sementes do solo de uma área de campo infestada por Eragrostis plana NEES

Abstract

The term “seed bank” has been used to designate the stock of viable seeds in soil, both deep and on the surface. This study aims to make an inventory and establish the diversity and density of the seed bank in the soil of a field area infested by Eragrostis plana Nees (annoni grass). The sampling was done by collecting 20 soil samples, which were arranged on aluminum trays and placed in greenhouses at Universidade Federal do Pampa (UNIPAMPA)/São Gabriel campus. The count and uprooting of the emerged seedlings took place at a quarterly frequency. We identified 3,308 individuals, which belonged to 26 species from 14 families, and the most predominant in species number were Asteraceae (23%) and Poaceae (15%). Native species from the flora of Rio Grande do Sul were prevalent. Overall, the seed density found was 84,237.3 seeds/m². The species with the higher germinated seed density were Juncus bufonius L. and Oxalis cf. brasiliensis Lodd. This study found a low species diversity, despite the high density.