CADIC   02618
CENTRO AUSTRAL DE INVESTIGACIONES CIENTIFICAS
Unidad Ejecutora - UE
congresos y reuniones científicas
Título:
Ecological impact of variable retention management in Nothofagus pumilio forests through the use of meta-analysis
Autor/es:
MARTÍNEZ PASTUR G.; SOLER ESTEBAN R.; LENCINAS M.V.; SCHINDLER S.; PERI P.L.
Lugar:
Concepción
Reunión:
Conferencia; IUFRO Landscape Ecology Conference.; 2012
Institución organizadora:
IUFRO
Resumen:
Forests are used for multiple purposes, generating conflictsbetween harvesting and biodiversity conservation.Variable Retention-VR is a management proposalimitating natural processes that can reduce these conflicts. In South Patagonia a portion of the original standsare maintained unlogged (30% as aggregated-AR and 15% as dispersed-DR retention) to preserve structural and compositional diversity.Meta-analysis combines several studies to synthetize individual findings.In this study, we assess the ecological impact ofVRmanagement inNothofaguspumilio forests using a data set encompassing a large quantity of published and unpublished research results from long-term plots and performing a meta-analysis.Weincluded 710 variables (113 types along the first 9 years-after-harvesting) measuring different aspects of (i) the abiotic environment (e.g. climate, soil), (ii) biodiversity (e.g. species richness and abundances), (iii) forest structure (e.g. volume), and (iv) forest reproduction (e.g. flowers).We compared the values for primary forests-PF, AR and DR with ANOVAs.We calculatedeffect sizes by Fisher´s Z-transformation using F values in random-effect models with categorical data using Metawin2.1 software.The results showed that DR and AR caused a decline in the values of forest structure and reproduction variables,and an increase in the values of the abiotic and biotic variables when compared to PF.As a general pattern, greater changes were observed in DR, while ARshowed lower impacts and values more similar to PF. We conclude that variable retention management has significant ecological impact, but that at least in the aggregates, primary conditions can partly be maintained.