Interannual variations in primary and secondary growth of Nothofagus pumilio and their relationships with climate
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The aim of this study is to evaluate the relationships between primary and secondary growth as well as the influences of climate variations on both types of growth.
The relationships between apical (or primary) and radial (or secondary) growth, and climatic influences on both types of growth, were evaluated for Nothofagus pumilio (Nothofagaceae), the dominant subalpine tree in Patagonia. We measured the spacing and number of nodes of annual shoots developed in the period 2001–2010 in 40 N. pumilio trees growing near the upper treeline in the northern Patagonian Andes (41°S). Variations in ring width at the base of each trunk were also recorded. Interannual variations in primary and secondary growth were significantly related to each other, and to several climate variables. Mean temperatures in winter and early spring (June–October) prior to the period of shoot extension were positively associated with both primary and secondary growth. In addition, total summer precipitation (December–March) was positively related to shoot extension, whereas mean summer temperature during the previous growth season (January–March) was directly related to radial growth. These climatic influences on N. pumilio growth may play a major role in regulating the expressions of preformation and neoformation.
KeywordsTree growth Treeline Precipitation Temperature Preformation Neoformation
Author contribution statement
Amaru Magnin: field work, sampling design, data analyses and manuscript writing. Javier Puntieri: field work, sampling design and manuscript writing. Ricardo Villalba: sampling design, data analyses and manuscript writing.
The authors thank Dr. Brian Luckman for reviewing the manuscript and the Administración de Parques Nacionales, Argentina, for authorizing the sampling within Nahuel Huapi National Park. This study was partially funded by Universidad Nacional del Comahue (B 138), CONICET (PIP112-200801-1026 and PIP 112-2011010-0809), the Inter-American Institute for Global Change Research (IAI) through CRN2047, supported by and the US National Science Foundation (GEO-0452325), and the Australian Research Council (ARC DP120104320).
Conflict of interest
The authors declare that they have no conflict of interest.
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