RT Conference Proceedings
T1 Testing tree-ring climate proxies and detrending methods in southwestern Iberian Pinus pinea L. ecosystems [Póster]
A1 Natalini, Fabio
A1 Alejano Monge, Reyes
A1 Vázquez Piqué, Javier
AB The adaptive response of forests to climate change can be assessed through the study of dendroclimatic signal. Primary data and standardization methods influence the information coming from dendroclimatic signals. We measured earlywood (EW), latewood (LW) and treering (TR) widths in 32 trees from two 140-year-old even-aged Pinus pinea stands in SW Spain, and tested three criteria for detrending tree-ring data: (1) double-detrending, i.e. treering indices were computed from a negative exponential curve and then detrended a second time using a smoothing spline with a rigidity equal to 67% of series length (Cook, 1985; Holmes et al., 1986), (2) Regional Curve Standardization (RCS) (Esper et al., 2003), and (3) smoothing spline with a rigidity that maximized the signal-to-noise ratio (Cook et al., 1990). Tree-ring indices were computed as ratios of ring widths to the expected growth values, the 1st-order autocorrelation was removed with an autoregressive model, and mean chronologies were obtained with biweight robust means of the prewhitened indices. Residual lowfrequency trends in the mean chronologies were examined by fitting polynomial curves. The high-frequency growth response to climate was studied through bootstrapped correlations between the mean chronologies and meteorological covariates. When EW and LW were examined and tree-ring data were detrended with the criterion 3, growth was highly  telated to rainfalls from winter to spring, negatively related to spring/early-summer high temperatures and positively related to autumn rainfalls. When TR width was examined as single variable and the detrending criteria 1 and 2 were used, the resolution of dendroclimatic signal was lower: correlations with spring  rainfalls, spring/early-summer temperatures and autumn rainfalls were lower or  not significant. The loss of low-frequency variability was higher with the detrending criterion 3. When dentrending criteria 1 and 2 were used, the residual lowfrequency oscillations in the mean chronologies displayed effects of exogenous disturbances (logging), and synchrony with long-term climatic changes (increasing temperatures and drought). Although maximizing the high-frequency signal can be useful to better interpret climate-growth relationships, more conservative dentrending methods may be of interest in the study of low-frequency response to climatic changes. Using multiple variables of tree-ring growth and comparing signals from different detrending methods can be advisable. 
YR 2015
FD 2015
LK http://hdl.handle.net/10272/12759
UL http://hdl.handle.net/10272/12759
LA eng
NO Natalini, F., Alejano Monge, R., Vázquez Piqué, J.: "Testing tree-ring climate proxies and detrendingmethods in southwestern Iberian Pinus pinea L. ecosystems". En: 14º Tree Rings in Archaeology, Climatology and Ecology (TRACE) (Sevilla, España, 20-23 marzo 2015)
NO Spanish Ministry of Economy and Competitiveness, European Union (FEDER funds), Spanish National Agriculture Research Institute (project ref: RTA2013-00011-C02-02), International Campus of Excellence for Environment, Biodiversity and Global Change (CeiCambio)
DS Repositorio Institucional de la Universidad de Huelva
RD 30 may 2026