INVESTIGADORES
LENCINAS Maria Vanessa
artículos
Título:
Environmental variables influencing regeneration of Nothofagus pumilio in system with combined aggregated and dispersed retention
Autor/es:
MARTÍNEZ PASTUR, G; CELLINI, JM; LENCINAS, MV; BARRERA, M; PERI, P
Revista:
FOREST ECOLOGY AND MANAGEMENT
Editorial:
ELSEVIER SCIENCE BV
Referencias:
Año: 2011 vol. 261 p. 178 - 186
ISSN:
0378-1127
Resumen:
The current silvicultural prescriptions for Nothofagus are
designed to stimulate natural regeneration by opening the canopy. One of these
methods is variable retention, which can include either or both aggregated and
dispersed retention. Different degrees of retention may modify microclimatic
variables differently and consequently offer dissimilar microenvironmental
conditions for regeneration. Retained canopy influences both biotic and abiotic
factors. The objective was to evaluate Nothofagus pumilio regeneration along
edge-related gradients within aggregated retention, and in the different
microenvironments within the harvested areas. The remnant canopy cover after
harvesting greatly influenced regeneration mainly by decreasing radiation
transmittance and soil moisture availability. Aspect (direction to the azimuth)
and distance from edge of aggregates influenced regeneration density, height
and growth. In dispersed retention, microenvironments generated by different
types of understory plant cover, debris, and proximity of remnant trees also
influenced regeneration. High levels of understory cover (up 50%) and medium
levels of harvesting debris cover (2550%) had a positive impact, while close
proximity to remnant trees had a negative impact on regeneration. These
findings can be used to improve silvicultural and harvesting prescriptions to
ensure successful establishment of regeneration and maximize potential growth.