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| DOI | 10.1111/JBI.13428 | ||||
| Año | 2018 | ||||
| Tipo | artículo de investigación |
Citas Totales
Autores Afiliación Chile
Instituciones Chile
% Participación
Internacional
Autores
Afiliación Extranjera
Instituciones
Extranjeras
Aim The aim of the study was to investigate postfire regeneration patterns of Araucaria-Nothofagus forests on the west slope of the Andes; to evaluate the relationship between remotely sensed burn severity and forest mortality; and to assess controls of burn severity on forest response at local spatio-temporal scales. Location Methods Araucania region in the western Andean Range of south-central Chile where fire occurred during the 2001-2002 season. Sampling of prefire stand structure and postfire vegetation response was performed along a burn severity gradient a decade after the fire. We evaluated the relationship between field-measured tree mortality and satellite-derived burn severity using a generalized linear model. We fit zero-inflated mixture models to regeneration data of each genus to assess the importance of abiotic variables, stand characteristics, and biotic interactions. Results Main conclusions The relative version of the delta Normalized Burn Ratio explained 85% of the variability in canopy mortality. Nearly 12,000 hectares burned; the majority at high severity (67%). Regeneration densities of both genera were lower at higher levels of burn severity and higher with greater total basal area (live, dead, and down trees). The relative effect size of burn severity on regeneration was nearly twice as large for Nothofagus, which suggests information legacies of Araucaria have cascading effects on postdisturbance material legacies. Araucaria-Nothofagus mortality from wildfire can be readily mapped using satellite-derived burn severity. Although environmental site characteristics and biotic interactions mediate regeneration, basal area, and burn severity are the main mechanisms controlling regeneration. Forest refugia and postfire regeneration are vulnerable to recurrent fire. Therefore, we expect future fire (either increased severity or frequency), driven by landscape level changes, as a potential mechanism that can reduce local resilience of these forests as initial postfire material legacies (e.g., refugia and regeneration) are removed from the landscape. Our findings highlight an approach to quantify important attributes of forest disturbance and refugia, and identify areas for monitoring postdisturbance regeneration as the forests throughout south-central Chile and Argentina face a multitude of potential change agents.
| Ord. | Autor | Género | Institución - País |
|---|---|---|---|
| 1 | Assal, Timothy J. | Hombre |
US GEOL SURVEY - Estados Unidos
Fort Collins Science Center - Estados Unidos |
| 2 | GONZALEZ-CANGAS, MAURO ESTEBAN | Hombre |
Universidad Austral de Chile - Chile
Centro de Ciencia del Clima y la Resiliencia - Chile Center for Climate and Resilience Research - Chile Ctr Climate & Resilience Res CR2 - Chile Centro de Ciencia del Clima y la Resiliencia (CR)2 - Chile |
| 3 | Sibold, Jason | Hombre |
COLORADO STATE UNIV - Estados Unidos
Colorado State University - Estados Unidos |
| Fuente |
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| FONDECYT |
| Fondo Nacional de Desarrollo Científico y Tecnológico |
| U.S. Geological Survey |
| Colorado State University |
| Center for Climate and Resilience Research -CR2 |
| College of Liberal Arts at Colorado State University |
| Government of South Australia |
| Agradecimiento |
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| Our study could not have been completed without the invaluable field assistance provided by Paul Szejner and Gonzalo Velasquez and the permission of managers at Tolhuaca National Park. We gratefully acknowledge the USGS Earth Resources Observation Systems Data Center for provision of satellite and ASTER GDEM data; Ariel Munoz and Jorge Silva for logistical assistance; Brian Cade for statistical consultation; and Patrick Anderson and two anonymous sources for manuscript review. MEG extends thanks to Center for Climate and Resilience Research -CR2 (CONICYT/FONDAP/15110009); FONDECYT No 1171400. TJA and JSS extend thanks to the College of Liberal Arts at Colorado State University for travel funding. |
| Our study could not have been completed without the invaluable field assistance provided by Paul Szejner and Gonzalo Velasquez and the permission of managers at Tolhuaca National Park. We gratefully acknowledge the USGS Earth Resources Observation Systems Data Center for provision of satellite and ASTER GDEM data; Ariel Muñoz and Jorge Silva for logistical assistance; Brian Cade for statistical consultation; and Patrick Anderson and two anonymous sources for manuscript review. MEG extends thanks to Center for Climate and Resilience Research -CR2 (CONICYT/FONDAP/15110009); FONDECYT N° 1171400. TJA and JSS extend thanks to the College of Liberal Arts at Colorado State University for travel funding. Any use of trade, firm, or product names is for descriptive purposes only and does not imply endorsement by the US Government. |