INITIAL ESTABLISHMENT OF THREE TREE SPECIES IN THE AFFORESTATION OF A DEGRADED AREA ON THE BANKS OF THE RIBEIRÃO DO GAMA DAM IN THE FEDERAL DISTRICT1

• DOI: https://doi.org/10.22533/at.ed.973542512035

• Palavras-chave: Tapirira guianensis, Hymenaea courbaril and Cryptocarya aschersoniana,

• Keywords: Tapirira guianensis, Hymenaea courbaril and Cryptocarya aschersoniana,

• Abstract:

  The study was conducted at Fazenda Água Limpa, owned by the University of Brasilia (15º55'S and 47º53'W). The experiment was set up during the rainy season in the Central Brazil region, with the aim of monitoring the initial establishment of forest species when used in the afforestation of a stretch on the right bank of the Gama stream dam. 552 seedlings of three species were used: Tapirira guianensis Aublet, Hymenaea courbaril Linnaeus and Crtptocarya aschersoniana Mezzidem. 369 individuals were planted in one area (area 1) and 183 in another (area 2). Survival rate and biometric development (height and collar diameter) were assessed. In areas 1 and 2, the seedlings showed 74 % and 57 % survival rates respectively, with the highest rates in both areas being achieved by the following species: T. guianensis (88 % and 90 %), H. courbaril (66 % and 46 %) and C. aschersoniana (67 % and 39 %). Considering the biometric evaluation, the species had the following height and diameter measurements, respectively: T. guianensis (72.4 cm and 15.6 mm), H. courbaril (49.4 cm and 8.1 mm) and C. aschersoniana (54.3 cm and 6.3 mm).  The higher survival rate and higher biometric averages of the T. guianensis species can be attributed to its good adaptation to hydraulically saturated soils with a high aluminum saturation content.