Avaliação do banco de sementes do solo de um trecho de floresta estacional semidecidual: Mata Atlântica no município de Foz do Iguaçu - PR

Abstract

For the National System of Conservation Unities (2000) laws, is understand for recuperation any action needed in order to certain area to get back to productive use with fine environmental balance. The present work is about nucleation techniques: soil transposition or seedbank transposition, which consists in remove superficial portions of soil with sacking. Is important to jut that, besides the seeds, living beings are carried too, and those are responsible for the nutrients, mineral and organic cycling that helps a degraded soil. The study was realized in a fragment of the “Seasonal Semideciduous Atlantic Forest”, in the City of Foz do Iguaçu, state of Paraná, in a touristic and particular propriety. There were established portions of 0,25 m² in random points of the forest, stored in plastic bags and then transported to the Federal Technologic University of Parana Campus, in the city of Medianeira – UTFPR, where it was homogenized, little portions were stored in little recipients and put on shelves. Part of them were covered with “sombrite 50%” and the rest of them exposed to the sun. Initially the monitoring was diary, the irrigation was according with the need and the evaluation consisted in quantifying the number of seedlings that emerged from the sacking and the seedbank of the soil. At the end of ninety days, samples of 32 seedlings in full sun and 70 seedlings of samples covered with 50% shade were recorded. The most abundant families were Asteraceae, Solanaceae and Malvaceae followed by Cyperaceae, Euphorbiaceae, Oxiladaceae, Araliaceae and Piperaceae. It is noteworthy that few seedlings were very small and were not possible to identify the same, yet were accounted for. The most species possesses anemocoric and herbaceous habit dispersion syndrome. According to recognized species is assumed that the forest has not reached its peak of development, because the presence of the man interfered with the dynamics of the forest since the area had already suffered significant environmental damage in the nineties.Only one trial was conducted during the rainy season in the region, it is recommended that further assessment of the seed bank, with collections being performed within one year from January to December, reaching all the seasons because it is considered this job as a pilot study.