Show simple item record Fajardo, Alex Gazol, Antonio Mayr, Christoph Camarero, J. Julio
dc.coverage.spatial Southern Andes
dc.coverage.temporal Last century 2019-06-12T07:05:11Z 2019-06-12T07:05:11Z 2019-05-22
dc.identifier doi:10.5061/dryad.vf24rg4
dc.identifier.citation Fajardo A, Gazol A, Mayr C, Camarero JJ (2019) Recent decadal drought reverts warming‐triggered growth enhancement in contrasting climates in the southern Andes tree line. Journal of Biogeography.
dc.description Aims: Rising temperature and declining summer precipitation due to the 1970s-climate shift in southern South America have reduced forest productivity at dry sites. Here, we worked with the most widespread Southern Hemisphere treeline species, Nothofagus pumilio, across contrasting climatic conditions and determined whether rising atmospheric CO2 concentrations as well as warmer and drier climatic conditions provoked by the 70s-climatic shift have been causing systematic changes in treeline growth rates and intrinsic water-use efficiency (iWUE).Location: 36–54° S, southern Andes. Time period: 1950–2010. Major taxa studied: Nothofagus pumilio. Methods: We worked at five disparate climatic treeline locations, spanning 18 degrees of latitude; at each location, we sampled trees at four different elevations, including treeline elevation. We quantified the variation of annual tree-ring width (TRW) as a function of climate, elevation, tree age, size, annual CO2 concentrations, and location, using linear mixed-effects models and interpreted TRW trends in relation to iWUE and isotope (δ13C and δ18O) signalling. Results: Across locations, the patterns of treeline growth occurring in the 1980–2010 period exhibited a clear and significant negative trend, in contrast to the previous 1950–1980 period. We found an increase of iWUE and δ18O across time and locations. Given that an increase in δ18O indicates a decrease in stomatal conductance, we assert that drought-induced stomatal closure appears to be causing the reduction in growth. Main conclusions: We show unequivocal evidence that warmer and drier summer conditions translated into a decrease of growth rates along the elevational treeline of the southern Andes, reverting previous growth improvements linked to climate warming. An improvement in iWUE at all locations is most likely explained by decreased stomatal conductance given the rising δ18O signal. An iWUE–growth decoupling may act as an ecological strategy to respond to drought.
dc.relation.haspart doi:10.5061/dryad.vf24rg4/1
dc.relation.isreferencedby doi:10.1111/jbi.13580
dc.subject carbon isotopes
dc.subject climate change
dc.subject Nothofagus pumilio
dc.subject oxygen isotopes
dc.subject Patagonia
dc.subject plant-climate interactions
dc.subject tree-rings
dc.subject water-use efficiency
dc.title Data from: Recent decadal drought reverts warming–triggered growth enhancement in contrasting climates in the southern Andes treeline
dc.type Article
dwc.ScientificName Nothofagus pumilio
dc.contributor.correspondingAuthor Fajardo, Alex
prism.publicationName Journal of Biogeography
dryad.dansTransferDate 2019-06-14T04:32:42.074+0000
dryad.dansArchiveDate 2019-06-14T08:03:42.967+0000

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Title Southern_Andes_July2
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Description Worksheet with tree ring width measurements of individual trees belonging to several treeline locations in the Southern Andes.
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