South American Dendroecological Fieldweek 2016

The South American Dendroecological Fieldweek (SADEF) associated with the Third American Dendrochronology Conference was held in El Bolsón, Argentina, in March 2016. The main objective of the SADEF was to teach the basics of dendrochronology while applying specific knowledge to selected research questions. The course included participants and instructors from six different countries. This report describes activities of the course and briefly summarizes exploratory group projects. The Introductory Group developed an Austrocedrus chilensis chronology from 1629–2015 and documented a persistent decline in growth since 1977 which supports the fact that the current severe drought is the most severe in the 386-year record. Based on regional A. chilensis chronologies from 32° to 39°S Latitude, the Stream Flow Reconstruction Group developed a regional 525 year-long reconstruction from Río Chubut and found the most severe drought episodes from 1490 to the present occurred from 1680–1705, 1813–1828, 1900–1920, 1993–2002, and from 2011 to the present. The Drought Reconstruction Group used A. chilensis annual tree-ring width chronologies to develop preliminary spatial field reconstructions of the Palmer Drought Severity Index spanning the Central Andes region. The reconstructions explain up to 81% of the 1907–1975 PDSI variance, indicating this tree species is powerful for informing on historical drought especially in very arid domains. The Dendroecology Group documented three spreading fires since the 1850s with a 12-year return interval but lack of fire for the last 94 years; they also documented a persistent decline in their chronologies in recent years, dating back to 1965.

Archaeology · Arid · Chronology · Climatology · Dendrochronology · Geography · Physical geography · Ecology · Forestry · Geology · Hydrology and Drought Analysis · Plant Water Relations and Carbon Dynamics · Tree-ring climate responses

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• Looking at the Wood, Seeing the Trees and More

  Gretel Boswijk, Luitgard Schwendenmann et al.•Tree-Ring Research•2025

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• Dendrochronological Applications in Zambia's Miombo Woodlands

  Nicole E Zampieri, James H Speer et al.•Tree-Ring Research•2026

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• KNMI Climate Explorer

  Valerie Trouet, Geert Jan van Oldenborgh•Tree-Ring Research•2013

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• Dendrochronology Course In Valsaín Forest, Segovia, Spain

  Ramzi Touchan, David M Meko et al.•Tree-Ring Research•2013

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• Long-Term Aridity Changes in the Western United States

  Open Access•Edward R Cook, Connie A Woodhouse et al.•Science•2004

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• A Multiscalar Drought Index Sensitive to Global Warming

  Sergio M Vicente-Serrano, Sergio M Vicente‐Serrano et al.•Journal of Climate•2010

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• Tree-ring based reconstructions of northern Patagonia precipitation since AD 1600

  Open Access•Ricardo Villalba, Edward R Cook et al.•The Holocene•1998

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• The International Tree-Ring Data Bank

  Open Access•Henri D Grissino‐Mayer, Henri D Grissino-Mayer et al.•The Holocene•1997

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• Dendroclimatic Changes in Semiarid America

  Open Access•Waldo S Glock, Edmund Schulman•Geographical Review•1957

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