Restoration of burned and post-fire logged Austrocedrus chilensis stands in Patagonia: effects of competition and environmental conditions on seedling survival and growth
M. Florencia Urretavizcaya A B D and Guillermo E. Defossé A C
+ Author Affiliations
- Author Affiliations
A Consejo Nacional de Investigaciones Científicas y Tecnológicas (CONICET), Centro de Investigación y Extensión Forestal Andino Patagónico (CIEFAP), CC 14 Esquel (9200) Chubut, Argentina.
B Ministerio de la Producción, Provincia de Chubut, Argentina.
C Universidad Nacional de la Patagonia San Juan Bosco, Facultad de Ingeniería, Esquel, Chubut, Argentina.
D Corresponding author. Email: mfurretavizcaya@ciefap.org.ar
International Journal of Wildland Fire 28(5) 365-376 https://doi.org/10.1071/WF18154
Submitted: 18 September 2018 Accepted: 21 January 2019 Published: 28 February 2019
Journal compilation © IAWF 2019 Open Access CC BY-NC-ND
Abstract
In Andean Patagonia, Argentina, severe wildfires produce high mortality in Austrocedrus chilensis forests. Owing to its high timber quality, A. chilensis trees are generally salvage logged right after wildfires. Post-logged areas result in open, denuded stands with low herbaceous or shrub cover, which precludes natural A. chilensis regeneration. In severely burned A. chilensis stands, we determined how different site conditions (salvage logging, SL, and without logging, WL), and the combination of different methods of control of above- and belowground competition and micro-environmental factors (incident radiation, soil temperature and soil moisture) affected survival, growth and hydric status of planted A seedlings. Two growing seasons after plantation, seedling survival was lower than 10% at SL sites, whereas it was near 90% at WL sites. Four seasons after establishment, and regardless of competition treatments, no seedlings survived at SL sites, whereas over 75% survived at WL sites. Radiation attenuation by canopy of WL sites benefitted A. chilensis seedling survival, and no additional control of early successional herbaceous species should be necessary to attain high seedling survival 4 years after restoration. Selective logging, by leaving ~50% of burned snags, and active restoration practices, may help reconcile economic needs of society and ecological requirements of A. chilensis for recovering former structure and functions.
Additional keywords: Andean cypress, facilitation, seedling performance, temperate forests.
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