Floristic characteristics and density of the soil seed bank of an open bamboo forest in eastern Acre

Abstract

The floristic aspects and the density of seedlings germinated from soil seed bank samples collected in dry and rainy periods in an Open Forest with bamboo located at Fazenda Experimental Catuaba, Senador Guiomard, Acre, were evaluated. The samples (n=40), with 625 cm² each and 20 m apart, were collected in a 400 m x 20 m plot in August/18 and January/2020. The samples were germinated in plastic trays watered every other day in a greenhouse. In determining the density of the germinated seedlings, the ratio between the total of germinated seedlings and the sum of the area of ​​the trays used in the experiment was used. To determine differences between samples collected in the two periods, the Shannon-Wiener diversity index (H ') and the Sorensen similarity index (DSC) were calculated. The results indicated that both the quantity and the density of germinated seedlings was similar in the samples collected in the two periods. A higher diversity index was found in the set of samples collected in the rainy season, which also had a greater number of families and species. There was a predominance, among the identified species, of taxa typical of secondary forest formations, corroborating results of other studies.