Abstract
Understanding the behavior of the emergence of native forest seeds is essential to achieve greater successes in forest recovery. Therefore, this study aimed to evaluate the emergence of native forest species (Cassia grandis L.F., Cecropia pachystachya Trec., Enterolobium contortisiliquum (Vell.) Morong, Guazuma ulmifolia Lam., and Libidibia ferrea var. leiostachya (Benth.) L.P.Queiroz.) in riparian areas of the Piauitinga River, in the municipality of Lagarto (state of Sergipe, Brazil). The experiment was carried out in a randomized block design (DBC) with four blocks in triple scheme (4 x 2 x 6): four forest species emerged (Cassia grandis, Enterolobium contortisiliquum, Guazuma ulmifolia, Libidibia ferrea var. leiostachya), with and without treatment to overcome dormancy, evaluated every fortnight for 90 days (6 periods). It was verified by the statistical analysis that the four species that had emergencies interacted in the two treatments used throughout the six evaluation periods. The species, in both treatments, presented a large number of seeds emerged in the first weeks after sowing, reducing over time. The species studied have a characteristic pattern of emergence over time, considering both seeds with and without treatment to overcome dormancy.
Highlights
Preservation of still existing natural ecosystems and the recovery of degraded areas, especially the Permanent Preservation Areas (APP) of riparian areas, are important alternatives to the maintenance and recovery of biodiversity (FERREIRA et al, 2013)
One of the rising techniques to environmental recovery has been direct seeding with use of forest species, which appeared as an alternative to speeding up the processes of ecological succession and it has been shown effective for this purpose (PEREIRA et al.,2014)
The selected species were: the pioneers Cecropia pachystachya Trécul and Guazuma ulmifolia Lam., and the lightdemander climax Cassia grandis L.f.Enterolobium contortisiliquum (Vell.) and Libidibia ferrea var.leiostachya (Benth.) L.P.Queiroz, according to the ecological group classification indicated by Oliveira-Filho et al (1995)
Summary
Preservation of still existing natural ecosystems and the recovery of degraded areas, especially the Permanent Preservation Areas (APP) of riparian areas, are important alternatives to the maintenance and recovery of biodiversity (FERREIRA et al, 2013). One of the rising techniques to environmental recovery has been direct seeding with use of forest species, which appeared as an alternative to speeding up the processes of ecological succession and it has been shown effective for this purpose (PEREIRA et al.,2014). The information about the usage effects of these procedures in the success of the emergence and survival of seedlings, especially under field conditions, are still scarce, even for species of which there are already studies reporting the use of pre-germination treatments to overcome such impediment in restoration activities through direct seeding (PEREIRA et al, 2013)
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