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gcb2757-sup-0001-TableS1.pdfWord document47KTable S1. Mean latitude of sites and age of trees (average of trees' ages sampled in different sites, as reported in the original articles) trough the period 1950–2003.
gcb2757-sup-0002-supportingfile.pdfWord document84KS1supporting text. Materials and Methods. Assessing the effects of iWUE uncertainty on model results.
gcb2757-sup-0003-FigS1.pdfWord document91KFigure S1. Variation in mean annual temperature (a), total annual precipitation (b) and numbers of wet days in a year (c) over the period 1950–2000 at the considered sites.
gcb2757-sup-0004-FigS2.pdfWord document864KFigure S2. Correlation scatter plot of climatic and atmospheric variables in the data set; Ca: atmospheric carbon dioxide concentration; Tm: mean annual temperature; P: annual precipitation; Dw: number of wet days; Nrate: annual rate of N deposition; Ncum: cumulative N deposition; SOx: annual rate of sulfur deposition; O3: annual rate of tropospheric ozone deposition.
gcb2757-sup-0005-FigS3.pdfWord document85KFigure S3. Variation in carbon isotope ratio (δ13C) between 1850 and 2000. Each point represents the mean of all tree chronologies for a given year. In the upper panel (a) empty circles represent angiosperms, in the lower panel (b) filled circles represent conifers. Vertical bars are ± 1.96 standard error. The continuous line corresponds to a locally weighed polynomial regression.
gcb2757-sup-0006-FigS4.pdfWord document96KFigure S4. Variation in carbon isotope discrimination (Δ13C) as a function of rising level of CO2 over the industrial period (1850–2000) for angiosperm (a) and conifer (b) species. Lines represent the theoretical changes of Δ13C to increased atmospheric concentrations of CO2 (Ca) according to the scenarios by Saurer et al. (2004): a totally passive response (scenario 1, dashed line), a constant ratio between intercellular (Ci) and atmospheric CO2 concentration (scenario 2, horizontal straight line), a constant Ci (scenario 3, dotted line). The continuous line corresponds to a locally weighed polynomial regression. Each point represents the mean of all tree chronologies of the corresponding species for a given year; vertical bars are ± 1.96 SE.
gcb2757-sup-0007-FigS5.pdfWord document317KFigure S5. Generalized Additive Modeling (GAM) results of mean annual temperature effects, panels (a) and (b), and total annual precipitation effects, panels (c) and (d), on intrinsic water-use efficiency (iWUE). The y-axis values indicate the x-axis covariate effect on the iWUE deviation from the mean predicted by the model (continuous line). Symbols are partial residuals around predicted covariate effects; empty circles for angiosperms, panels (a) and (c); filled circles for conifers, panels (b) and (d). The shaded areas indicate the 95% confidence interval. The number on each y-axis caption is the effective degrees of freedom for the term being plotted.
gcb2757-sup-0008-FigS6.pdfWord document53KFigure S6. Tropospheric ozone concentration (a)) and SOx deposition (b)) in the period 1950–2000. Circles represent the average values for the considered sites (N = 53); vertical bars are ± 1.96 SE.
gcb2757-sup-0009-FigS7.pdfWord document326KFigure S7. Generalized Additive Modeling (GAM) results of SOx deposition effects, panels (a) and (b), and O3 deposition effects, panels (c) and (d), on intrinsic water-use efficiency (iWUE). Other covariates were mean annual temperature Tm, annual precipitation P, and atmospheric CO2 concentration Ca. The y-axis values indicate the x-axis covariate effect on the iWUE deviation from the mean predicted by the model (continuous line). Symbols are partial residuals around predicted covariate effects; empty circles for angiosperms, panels (a) and (c); filled circles for conifers, panels (b) and (d). The shaded areas indicate the 95% confidence interval. The number on each y-axis caption is the effective degrees of freedom for the term being plotted.

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