Evaluation of techniques of forest restoration of area dominated for Leucaena leucocephala (Lam) of Wit., Ipatinga, MG / Avaliaçao de técnicas de restauração florestal de área dominada por Leucaena leucocephala (Lam) de Wit. em Ipatinga, MG

AUTOR(ES)
DATA DE PUBLICAÇÃO

2009

RESUMO

The objective this to characterize the soil seed bank an area of Ribeirão Ipanema, Ipatinga city, MG, domined for Leucaena leucocephala (PL); to compare the results gotten in the seed bank of Parque Estadual do Rio Doce’s (PERD) area delimited, same city; to analyze the sowing of one mix of seeds in modules and to evaluate the alternative of seedlings’ plantation of different successionals groups. The averages density of seeds germinated for tray was of 760,79 seeds/m3 in PL and 92,05 seeds/m3 in the PERD area. Among the tree species they had been relief, in number of individuals, Muntingia calabura and Leucaena leucocephala. Although the PL to have presented bigger density of individuals, these is in its majority characterized as harmful plants. The number of pioneers and secondary species was bigger in the area of the PERD in relation to the PL, that is, the PERD still preserves essential species for its area conservation and classification as native. The PERD and the PL had presented the same number of exotic species, however these had been much more abundant in the last one, with prominence for Muntingia calabura and Leucaena leucocephala. For the methodology of direct sowing and plantation of seedlings it was established three treatments, where one consisted of completed cut of all the individuals, the other was the cut of the individuals with CAP ≥ 35 cm and the last it was control treatment. For the direct sowing in modules, was used the species: Anadenanthera macrocarpa, Mabea fistulifera, Schizolobium parahyba, Genipa americana L. and Piptadenia gonoacantha. The treatments had been evaluated monthly during the period of eight months, through identification of the germinated and established individuals, besides the measurement of the height. Mabea fistulifera and Anadenanthera macrocarpa had been the species that had more germinated, and also if they for being the only ones that they had than survived for three months or more observed of the experiment. It had low germination percentage, and high mortality of these (93%). The factor competition for light, due to the exotic species aggressive Leucaena leucocephala, was what more it influenced negative the experiment, where the treatment canopy gap, one more expressive toward to the development in height. For the methodology of plantation of native seedlings in modules, they had been used seedlings of Euterpe edulis Mart., climax species, and Schizolobium parahyba (Vell.) Blake, pioneer species. The treatments had been evaluated to the four months after the implantation and 7 months after the first evaluation, through the measurement of the height and the diameter at roots collar height (DAC) of the established individuals. The averages of DAC and height of the plants had been compared by test t, in level of 5% of probability. The treatment canopy gap, was what more expressive toward to the growth in height, being that its effect was more evident in the Schizolobium parahyba species. For the DAC, the control treatment it positively influenced the Euterpe edulis species and the treatment of the canopy gap the Schizolobium parahyba species. The method plantation of seedlings, allied treatment canopy gap, if showed efficient for the area.

ASSUNTO(S)

espécies nativas recuperação de áreas degradadas regeneration semeadura direta banco de sementes inhibition direct sowing leucaena inibição conservacao da natureza leucena native species recuperation of areas abase regeneração seed bank

ACESSO AO ARTIGO

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