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Revista chilena de historia natural

Print version ISSN 0716-078X


DEZZOTTI, ALEJANDRO et al. Regeneration of a Nothofagus (Nothofagaceae) mixed forest after selective cutting. Rev. chil. hist. nat. [online]. 2003, vol.76, n.4, pp.591-602. ISSN 0716-078X.

Understanding forest regeneration is essential to develop sound, ecologically-based silvicultural practices. Mount Tren Tren (40°12' S, 71°26' W, 1,367 m, Reservation Mapuche Curruhuinca, Argentina) is occupied by a closed stand of Nothofagus dombeyi, N. obliqua, and N. nervosa. In 1994, tree regeneration (root collar diameter < 10 cm) was estimated to be 90 ind ha-1. After that, a group selection silvicultural system was implemented and the resulting 10 artificial gaps of between 1,587 and 4,322 m2 were enclosed to prevent grazing by domestic livestock. Size and age structure of regeneration were analysed based on systematic and random samplings. All tree species became established simultaneously within the artificial gaps. However, the less light demanding N. nervosa exhibited a mean age slightly larger given its differential persistence as "advanced regeneration" previous to cutting treatment. Tree regeneration was estimated in 97,006 ind ha-1 (68 % of N. dombeyi, 20 % of N. obliqua, and 12 % of N. nervosa). Regeneration abundance and composition were unrelated to shape and size of regeneration gaps, nor to abundance of adult trees within the stand and along the gap boundaries. A significant positive effect of the enclosure on plant was observed. The 86 % of juvenile Nothofagus were present when understory height and cover were low to intermediate. The management plan is considered adequate if the abundance of regeneration is compared before and after its implementation, and encourages the use and conservation of this forest type under the current silvicultural system

Keywords : Nothofagus dombeyi; Nothofagus obliqua; Nothofagus nervosa; forest management; northern Patagonia.

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