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Table S1 Correlation between daily means of δ13C and δ18O and daily average of ci/ca, Gs, A, and meteorological parameters. In the first row Pearson's correlation coefficients are displayed in the second row (in italics) significance levels are given. Bold figures indicate Pearson's correlation to be significant. Gs and ci/ca were weighted for A. Table S2 Correlation between daily averages of δ13C and δ18O of soluble organic matter in different tissues (leaves, phloem of twigs, of the upper stem, of the middle stem and of the stem base). In the first row Pearson's correlation coefficients are displayed in the second row (in italics) significance levels are given. Bold figures indicate Pearson's correlation to be significant. Fig. S1 Canopy stomatal conductance (Gs) plotted against leaf level stomatal conductance (gs). The regression line displayed was forced through zero. Gs was calculated as half hourly mean value from sap flow densities measured with 12 trees according to equation 1; gs was determined for 4 trees 4 times a day using a portable photosynthesis measurement device (LC A4) and correlated with Gs determined at the same times. Data were omitted when RH values close to 100% occurred which may have lead to an overestimation of the canopy level Gs calculations (see discussion). Fig. S2 9-day-average starch concentrations in current year needles. Needle samples were collected four times each day: in the morning (between 08:00 and 10:00), at midday/afternoon (12:45–15:00), in the evening (17:30–20:00) and during night (22:00–01:00). Data shown are mean values from one tree ? SE. Fig S3 Regression line (black line) between daily means of ci/ca and δ13C of the water soluble organic matter of current year needles. ci/ca was weighted for A. The bold blue line is d13C calculated from equation 2 assuming δ13C of atmospheric CO2 amounting to constantly –7.9‰. Fig. S4 Regression lines between δ18O and δ13C of phloem organic matter from the twig phloem and the phloem from the upper and lower stem (base). Data shown are daily mean values from 4 trees measured at 4 time points per 24 h.

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