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End date: 2022 × Start date: 2021 × Species: Nothofagus obliqua × Subject: CAMBIO CLIMATICO ×

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Now showing 1 - 3 of 3
  • Artículo de revista
    Climate response and drought resilience of Nothofagus obliqua secondary forests across a latitudinal gradient in south-central Chile
    The climate response and resilience of tree growth to drought events have been widely reported for forests from the Northern Hemisphere. However, studies are much scarcer in the extra-tropical forests of southern South America. Mediterranean and Temperate forests of Chile are suffering from a moderate warming and a sustained precipitation decrease, occurring on top of an unprecedented megadrought since 2010. This study evaluated tree-growth patterns, the climate response and drought resilience of nine secondary Nothofagus obliqua forests across a latitudinal gradient from Mediterranean to Temperate climate in the Andes of Chile (35.7° to 40.3° S). Moreover, to improve the understanding of the spatial variation in productivity patterns, this research assessed trends in the maximum Normalized Difference Vegetation Index (peak in the NDVI) across the gradient for 2001–2018. Tree-growth patterns were highly influenced by stand dynamics, with steep decreasing trends in most of the stands related to a gradual canopy closure. Productivity trends had a flat pattern north of 38oS, but positive trends south of this latitude, which were mostly attributed to stand development. Tree growth was positively related to precipitation in all the sites, with annual and summer rainfall being more important in the north (Mediterranean climate) and south (Temperate climate), respectively. Conversely, maximum temperature had a negative effect on growth in most of the studied forests. This implies that projected warmer and drier conditions may have a detrimental effect on N. obliqua growth during coming decades. The two northern stands, located at the species dry range edge, were among the most resilient to drought and have not been strongly affected by the current megadrought in the area. Overall climate conditions, however, do not define the tolerance of stands to droughts, likely because local environmental and forests conditions play a key role. Although droughts have not strongly impacted the growth of N. obliqua across its distribution so far, future studies should assess the effects of the current long-term megadrought on growth resilience, and physiological studies should address the impacts of droughts and heat waves on forest function beyond what growth can unveil.
    Urrutia-Jalabert, Rocío-Barichivich Henríquez, Jonathan Eligio-Rozas, V.-Lara Aguilar, Antonio-Rojas Ponce, Yasna-Bahamóndez V., Carlos-Rojas-Badilla, Moisés-Gipoulou-Zuñiga, T.-Cuq, Emilio
    2021
  • Libro
    Vulnerabilidad al cambio climático del tipo forestal Roble-Raulí-Coihue. Región de Ñuble
    El propósito de este informe es describir la vulnerabilidad al cambio climático por parte de las formaciones forestales del tipo forestal Roble-Raulí-Coihue de la región del Ñuble. Sus resultados obedecen a un proceso de colección de todos los antecedentes de datos e información pertinentes que caractericen los escenarios climáticos futuros para esta región y por medio de la identificación de esquemas silvícolas apropiados para la región, calcular los valores de vulnerabilidad al cambio climático por parte de los bosques de Roble-Raulí-Coihue en esta región.
    Bahamóndez V., Carlos-Büchner, Carlos-Müller-Using, Sabine-Rojas Ponce, Yasna-Schlegel Heldt, Bastienne-Vergara Asenjo, Gerardo
    Región de Ñuble
    2022
  • Libro
    Vulnerabilidad al cambio climático del tipo forestal Roble-Raulí-Coihue de la región de Los Ríos. Chile
    El propósito de este informe es reportar sobre la vulnerabilidad al cambio climático de las formaciones arbóreas del Tipo Forestal Roble-Raulí-Coihue de la región de los Ríos, haciendo uso de un soporte metodológico que considera no solo los aspectos biofísicos de los bosques, sino también su respuesta ecofisiológica frente a nuevos escenarios climáticos y sus aspectos socioeconómicos. De esta forma, luego de colectar todos los antecedentes metodológicos, los datos e información pertinentes que caracterizan los escenarios futuros permiten contar con información relevante para sustentar propuestas de esquemas silvícolas apropiados para facilitar la adaptación al cambio climático.
    Bahamóndez V., Carlos-Büchner, Carlos-Müller-Using, Sabine-Rojas Ponce, Yasna-Schlegel Heldt, Bastienne-Vergara Asenjo, Gerardo
    Región de Los Ríos
    2021