Increased water use efficiency but contrasting tree growth patterns in Fitzroya cupressoides forests of southern Chile during recent decades
Author
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Urrutia Jalabert, Rocío
Author
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Malhi, Yadvinder
Author
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Barichivich, Jonathan
Author
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Lara, Antonio
Author
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Delgado Huertas, Antonio
Author
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Rodríguez, Carmen Gloria
Author
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Cuq, Emilio
Admission date
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2016-03-21T19:36:52Z
Available date
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2016-03-21T19:36:52Z
Publication date
dc.date.issued
2015
Cita de ítem
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J. Geophys. Res. Biogeosci., 120, 2505–2524
en_US
Identifier
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DOI: 10.1002/2015JG003098
Identifier
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https://repositorio.uchile.cl/handle/2250/137264
General note
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Artículo de publicación ISI
en_US
Abstract
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Little is known about how old-growth and massive forests are responding to environmental change. We investigated tree-ring growth and carbon isotopes of the long-lived and high biomass Fitzroya cupressoides in two stands growing in contrasting environmental conditions in the Coastal Range (similar to 300years old) and Andean Cordilleras (>1500years old) of southern Chile. The interannual variability in C-13 was assessed for the period 1800-2010, and changes in discrimination and intrinsic water use efficiency (iWUE) were evaluated in relation to changes in climate and tree-ring growth during the last century. C-13 discrimination has significantly decreased, and iWUE has increased since the 1900s in both sites. However, these trends in isotopic composition have been accompanied by different growth patterns: decreasing growth rates in the Coastal Range since the 1970s and increasing growth rates in the Andes since the 1900s. Trees growing in the Coastal Range have become more efficient in their use of water, probably due to reduced stomatal conductance caused by increases in CO2 and warming. Trees growing in the Andes have also become more water use efficient, but this has been likely due to increased photosynthetic rates. Fitzroya forests, including particularly old-growth stands, are responding to recent environmental changes, and their response has been site dependent. The growth of forests under a more Mediterranean climate influence and restrictive soil conditions in the Coastal Range has been more negatively affected by current warming and drying; while the growth of old stands in the wet Andes has been positively affected by changes in climate (decreasing cloudiness) and increasing CO2. Permanent monitoring of these endangered forests under ongoing environmental changes is needed in order to reassure the long-term preservation of this millennial-aged species.
en_US
Patrocinador
dc.description.sponsorship
FONDECYT
1130410
Inter-American Institute for Global Change Research - NSF
CRNII2047
GEO-0452325
Center for Climate and Resilience Research (CR)2
CONICYT/FONDAP/15110009
HSFS Huinay
RNM8011
2013CL0017
Junta de Andalucia
RNM309