INVESTIGADORES
LENCINAS Maria Vanessa
congresos y reuniones científicas
Título:
New alternative silviculture for Nothofagus pumilio forest conservation with aggregated and dispersed retention
Autor/es:
MARTÍNEZ PASTUR G; LENCINAS MV; CELLINI JM; PERI P; VUKASOVIC R
Lugar:
San Carlos de Bariloche
Reunión:
Workshop; Workshop on Forest Fragmentation in South America; 2006
Institución organizadora:
CEMAGREF-CRUB
Resumen:
Several regeneration methods have been applied in south Patagonia forests (e.g. clear-cuts and selective cuts) being the shelterwood cut system the most widespread used. These methods were mainly based on economical criteria and enhancing the natural regeneration of the harvested stands. However, ecological criteria with wide social acceptance have been included in the planning of the forest management. Based on previously developed biodiversity indicators, a new alternative silviculture proposal was developed. The scheme contain: (a) an aggregated retention (30% of timber forests) in a systematic island pattern (diameter of 60 m each) and a dispersed retention (10-15 m²/ha) for more than one forest term; (b) an increment in the harvesting yield (60-200 m³/ha according to site quality); (c) oriented cuts and extractions of full stems; and (d) a friendly environment design and construction of primary and secondary roads. The research includes the establishment of a large scale experimental plot where several silviculture alternatives were studied in an area of 50 ha. In the first stage, economical feasibility, stand and sawmill yield, as well as diversity loss estimations were carried out. Also, stability of the forest over-story, tree seed production (quality and quantity), dynamics (establishment, growth and mortality) and eco-physiology of regeneration were studied. Based on economical evaluation and incremental costs at large scale, the new proposal was included in the planning of two middle size sawmills (20000 m3/yr) harvesting in private forest lands. At present, the proposal was successfully implemented over 500 ha (15-20% of cuts in Tierra del Fuego ? Argentina during the last years).