Araucaria araucana tree-ring chronologies in Argentina: spatial growth variations and climate influences
Seventeen tree-ring chronologies from the conifer Araucaria araucana (Molina) K. Koch have been analyzed across its range of distribution in Argentina. We studied the growth patterns and determined the main climatic factors influencing A. araucana radial growth. All the chronologies show a strong co...
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ftunivlaplata:oai:sedici.unlp.edu.ar:10915/131918 2023-05-15T14:01:55+02:00 Araucaria araucana tree-ring chronologies in Argentina: spatial growth variations and climate influences Mundo, Ignacio Alberto Roig Juñent, Fidel Alejandro Villalba, Ricardo Kitzberger, Thomas Barrera, Marcelo Daniel 2011-08-25 application/pdf 443-458 http://sedici.unlp.edu.ar/handle/10915/131918 en eng http://sedici.unlp.edu.ar/handle/10915/131918 issn:0931-1890 issn:1432-2285 http://creativecommons.org/licenses/by/4.0/ Creative Commons Attribution 4.0 International (CC BY 4.0) CC-BY Ingeniería Forestal Growth patterns PCA Northern Patagonia ENSO AAO PDSI Articulo 2011 ftunivlaplata 2022-03-06T01:05:45Z Seventeen tree-ring chronologies from the conifer Araucaria araucana (Molina) K. Koch have been analyzed across its range of distribution in Argentina. We studied the growth patterns and determined the main climatic factors influencing A. araucana radial growth. All the chronologies show a strong common signal observed by the high amount of variance explained by the first principal component (PC1) and the high mean correlation (r = 0.597) between the chronologies over the 1676–1974 interval. On this basis, we developed a regional chronology that is 866 years long (A.D. 1140–2006) and includes 621 tree-ring series. Based on the PC2 scores, chronologies were clearly separated by elevation in high- and low-elevation records. Regional tree growth is strongly negatively related to temperatures during summer and fall in the previous-growing season and spring in the current-growing season, respectively. A positive association of tree growth with precipitation is recorded during spring in the current growing season. These results suggest a close relationship between A. araucana tree growth and water availability on a regional scale. This observation is also consistent with a positive and significant correlation between our A. araucana regional record and a reconstruction of November–December rainfall for northern Patagonia inferred from the xeric Austrocedrus chilensis during the past 400 years. Negative correlations between A. araucana regional growth and the sea surface temperature in the Nino 3.4 region reflect the occurrence of above-mean summer temperatures in the region during positive tropical Pacific SST anomalies. The negative relationship with the Antarctic Oscillation (AAO) results from reduced precipitation in our study region during the positive phase of the AAO. The effect of elevation on water availability is consistent with significant correlations between ring-width variations at lower elevations and the Palmer Drought Severity Index during spring and summer in the current growing season. Our study emphasizes the high dendroclimatological potential of A. araucana chronologies for reconstructing past climate variations in northern Patagonia during the past millennium. Laboratorio de Investigación de Sistemas Ecológicos y Ambientales Article in Journal/Newspaper Antarc* Antarctic Universidad Nacional de La Plata (UNLP): SeDiCI (Servicio de Difusión de la Creación Intelectual) Antarctic Argentina Molina ENVELOPE(-62.017,-62.017,-64.017,-64.017) Pacific Patagonia The Antarctic |
institution |
Open Polar |
collection |
Universidad Nacional de La Plata (UNLP): SeDiCI (Servicio de Difusión de la Creación Intelectual) |
op_collection_id |
ftunivlaplata |
language |
English |
topic |
Ingeniería Forestal Growth patterns PCA Northern Patagonia ENSO AAO PDSI |
spellingShingle |
Ingeniería Forestal Growth patterns PCA Northern Patagonia ENSO AAO PDSI Mundo, Ignacio Alberto Roig Juñent, Fidel Alejandro Villalba, Ricardo Kitzberger, Thomas Barrera, Marcelo Daniel Araucaria araucana tree-ring chronologies in Argentina: spatial growth variations and climate influences |
topic_facet |
Ingeniería Forestal Growth patterns PCA Northern Patagonia ENSO AAO PDSI |
description |
Seventeen tree-ring chronologies from the conifer Araucaria araucana (Molina) K. Koch have been analyzed across its range of distribution in Argentina. We studied the growth patterns and determined the main climatic factors influencing A. araucana radial growth. All the chronologies show a strong common signal observed by the high amount of variance explained by the first principal component (PC1) and the high mean correlation (r = 0.597) between the chronologies over the 1676–1974 interval. On this basis, we developed a regional chronology that is 866 years long (A.D. 1140–2006) and includes 621 tree-ring series. Based on the PC2 scores, chronologies were clearly separated by elevation in high- and low-elevation records. Regional tree growth is strongly negatively related to temperatures during summer and fall in the previous-growing season and spring in the current-growing season, respectively. A positive association of tree growth with precipitation is recorded during spring in the current growing season. These results suggest a close relationship between A. araucana tree growth and water availability on a regional scale. This observation is also consistent with a positive and significant correlation between our A. araucana regional record and a reconstruction of November–December rainfall for northern Patagonia inferred from the xeric Austrocedrus chilensis during the past 400 years. Negative correlations between A. araucana regional growth and the sea surface temperature in the Nino 3.4 region reflect the occurrence of above-mean summer temperatures in the region during positive tropical Pacific SST anomalies. The negative relationship with the Antarctic Oscillation (AAO) results from reduced precipitation in our study region during the positive phase of the AAO. The effect of elevation on water availability is consistent with significant correlations between ring-width variations at lower elevations and the Palmer Drought Severity Index during spring and summer in the current growing season. Our study emphasizes the high dendroclimatological potential of A. araucana chronologies for reconstructing past climate variations in northern Patagonia during the past millennium. Laboratorio de Investigación de Sistemas Ecológicos y Ambientales |
format |
Article in Journal/Newspaper |
author |
Mundo, Ignacio Alberto Roig Juñent, Fidel Alejandro Villalba, Ricardo Kitzberger, Thomas Barrera, Marcelo Daniel |
author_facet |
Mundo, Ignacio Alberto Roig Juñent, Fidel Alejandro Villalba, Ricardo Kitzberger, Thomas Barrera, Marcelo Daniel |
author_sort |
Mundo, Ignacio Alberto |
title |
Araucaria araucana tree-ring chronologies in Argentina: spatial growth variations and climate influences |
title_short |
Araucaria araucana tree-ring chronologies in Argentina: spatial growth variations and climate influences |
title_full |
Araucaria araucana tree-ring chronologies in Argentina: spatial growth variations and climate influences |
title_fullStr |
Araucaria araucana tree-ring chronologies in Argentina: spatial growth variations and climate influences |
title_full_unstemmed |
Araucaria araucana tree-ring chronologies in Argentina: spatial growth variations and climate influences |
title_sort |
araucaria araucana tree-ring chronologies in argentina: spatial growth variations and climate influences |
publishDate |
2011 |
url |
http://sedici.unlp.edu.ar/handle/10915/131918 |
long_lat |
ENVELOPE(-62.017,-62.017,-64.017,-64.017) |
geographic |
Antarctic Argentina Molina Pacific Patagonia The Antarctic |
geographic_facet |
Antarctic Argentina Molina Pacific Patagonia The Antarctic |
genre |
Antarc* Antarctic |
genre_facet |
Antarc* Antarctic |
op_relation |
http://sedici.unlp.edu.ar/handle/10915/131918 issn:0931-1890 issn:1432-2285 |
op_rights |
http://creativecommons.org/licenses/by/4.0/ Creative Commons Attribution 4.0 International (CC BY 4.0) |
op_rightsnorm |
CC-BY |
_version_ |
1766271989231648768 |