Resumo

CABEZAS GUTIERREZ, Marco; PENA BARACALDO, Fernando; DIAZ, Cristhian Janier  e  MORENO, Andrés Felipe. CANOPY OF THREE FOREST SPECIES AND THEIR RELATION TO ADAPTATION TO BY EROSION DEGRADED SOILS. rev.udcaactual.divulg.cient. [online]. 2008, vol.11, n.2, pp.175-185. ISSN 0123-4226.

During 30 months an experiment was carried out at the locality of Firavitoba - Boyacá, to evaluate and analyze the canopy changes and the adaptive capacity of three cold climate forest species, Alnus acuminata H. B. K., Escallonia pendula Pers. and Quercus humboldtii Bompl., in a by water eroded degraded soil. All three species were planted in two spatial arrangements "tres bolillo" and square methods. The species were situated in distinct treatments of simple and compound mixtures. Plant height, leaf emission, leaf area index (LAI), crown diameter expansionaand fallen leaf litter were measured. It was determined that A. acuminata is a high sensible plant to drought stress, presenting high losses of planted trees, while, E. pendula showed the major survival index. However, A. acuminata had the best elongation index, a major leaf rate emission and a constant growth of LAI, even though it showed periods of massive leaf fall. Q. humboldtii demonstrated to be a species that needs shading during the first 24 months after transplanting, since, when sown in monoculture, the plant growth was slow and the development of few leaf structures was observed. The three species improved the soil nutrition conditions due to the litter incorporation. The research established the planting conditions for the three species and concluded that it is possible to use them in order to promote reforestation programs, preferably in mixtures, on soils with high erosion levels.

Palavras-chave : Leaf area; litter; growth; forest species.

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