INVESTIGADORES
LENCINAS Maria Vanessa
congresos y reuniones científicas
Título:
Landscape ecological approaches applied to forest management in South Patagonia.
Autor/es:
SOLER ESTEBAN, R; MARTÍNEZ PASTUR, G; LENCINAS, MV
Lugar:
Portland
Reunión:
Simposio; US-IALE Symposium: Sustainability in Dynamic Landscapes; 2011
Institución organizadora:
IALE
Resumen:
Productive human
activities (e.g., harvesting and livestock) produce environmental changes,
increasing the heterogeneity at the landscape level. This modifies biological
and ecological processes. To attain a sustainable forest management it was
requires knowledge of key aspects of these processes. Our work aims to
understand the changes that occur at the landscape due to logging and cattle
grazing in Nothofagus forests at southern Patagonia. During the last 3 years we
studied flowering and seeding patterns, natural regeneration and understory
dynamics, in primary forests, harvested and silvopastoral stands of Nothofagus
antarctica (ñire) and N. pumilio (lenga). Since 2008 we used traps to collect
flowers and seeds, monitor regeneration permanent plots and understory
transects. Also, we made indirect estimation of landscape uses by native (Lama
guanicoe) and domestic herbivores (cattle and sheep) through the study of diet
composition. Flowering and seeding was influenced by management and years, but
also by their landscape distribution. Recruitment was influenced by seed
availability, but also for the management and the micro-environments inside the
stand. Only the unmanaged stands showed exclusive native species in the
understory, and silvicultural practices increased coverage and richness of
exotic species (potential competition with seedlings of Nothofagus). However,
some practices (e.g., aggregate retention) remain part of the heterogeneity of
unmanaged stands, including the diversity of understory plant species. Finally,
native and domestic herbivorous alternate the uses of different environments.
Native species preferred N. pumilio forests, except in winter, where domestic
species had major predominance. These ecological studies improve forest
management aimed to conservation.