Avaliação do banco de sementes do solo de um fragmento de floresta estacional semidecidual no município de Medianeira – PR

Abstract

This work aimed to evaluate a fragment of seedbank located in the city Medianeira-PR of Seasonal Semideciduous Forest on three conditions, in full sun, “sombrite 50%” and “sombrite 75%”. The soil transposition refers to a nucleation technique that consists in removing soil surface portions with sacking. Soil samples were collected at approximately 0,25m² installments at six points covering the edges and the center of the area, were later stored in plastic bags and taken to the Federal Technological University of Paraná Campus Medianeira - PR, where they were homogenized and transported to plastics and allocated vessels in the three conditions studied. The pots were watered daily and monitored as necessary. At the end of the experiment emerged 319 seedlings. 62 individuals were recorded in full sun, 129 in sombrite 50% and 128 in sombrite 75%. Families have been found Asteraceae, Solanaceae, Oxiladaceae, Bignoniaceae, Urticaceae and Poaceae. The most abundant species was the Gnaphalium purpureum var spicatum. According to the recognized species in the fragment it is assumed that the fragment has undergone a disturbance, because it is in a predominantly urban area. It held just a collection in dry season, preventing a more detailed study of the seed bank of this fragment. Through the calculation of diversity indices fragment has little diversity and species are not equally abundant. It held just a collection in dry season, but the literature recommends at least two samples at different times of the year.