Análise do banco de sementes no solo em área ciliar de caatinga no semiárido paraibano.

Abstract

The work aimed at to evaluate the composition and dynamics of the bank of seeds in the soil in ciliary area of Caatinga, subsidizing the establishment of mechanisms that define the conservation strategies and recovery of the half degraded in the semiarid paraibano. The survey was carried along the stream of Umburana. For the study of the bank of seeds 51 soil samples were collected. The bank of seeds in the soil in the riverine area of the stream of Umburana was represented by 105 species belonging to 45 genuses and 25 botanical families, besides 28 seedling. The predominant component was the herbaceous, which was followed by the arboreal, shrub and for the lianes. The families more characteristics of the bank of seeds in the soil were followed Euphorbiaceae for Fabaceae, Malvaceae and Poaceae and still Convolvulaceae. Analyzing the most representative species particularly, the more numerous five were verified they were Euphobiaceae 3 (1,275 seedling), Commelina sp. (712 seedling), Sida cordifolia (435 seedling), Blainvillea rhomboidea (348 seedling) and Poaceae 1 (269 seedling). These species represented 53,5% of the individuals' total registered.