Figure captions
FIGURE 1: Environmental data in Rosinedal in 2012 and 2013. Sum
of daily precipitation (A), daily mean photosynthetic photon flux
density (B), daily mean temperature (C) and daily VPD during day light
hours (D) in the fertilised (F, black circle) and in the reference (R,
white circle) plots, respectively. Grey areas represent the thermal
growing season.
FIGURE 2: Canopy conductance corrected by \(\hat{\alpha}\) for
the fertilised (black circles and, solid lines) and the reference (white
circles, dashed lines) plots in 2012 and 2013. Grey areas represent the
thermal growing seasons
FIGURE 3: Atmospheric δ13Casignature in 2012 and 2013 (A) and phloem
δ13Cp signature in 2012 (B) ± SE (n =
15). ns, +, *, **, *** correspond to p ≥ 0.1, p< 0.1, 0.05, 0.01 and 0.001, respectively, after pairwise
comparison for each date. Grey areas represent the thermal growing
seasons. The fertilised plot is represented in black circles and solid
line and the reference plot in white circles and dotted line
FIGURE 4: Intrinsic water use efficiency at stand level
(WUEi) for fertilised (filled circles and solid line)
and reference plot (empty squares and dashed line) in 2012 and 2013,
assuming a gm∞ assumption (green), a
gm/\(g_{C\hat{\alpha}}\) = 2.67 assumption (yellow) or a
gm = 0.31 mol CO2 m-2s-1 assumption (blue). Grey areas represent the
thermal growing season Statistical results comparing
WUEi between fertilised and reference plots: ***
correspond to p < 0.001, respectively, after anova.
FIGURE 5: Daily GPPPRELES (orange) and
GPPiso/SF (blue) in the fertilised plot (upper row) and
in the reference plot (lower row). Shaded areas around the curves
represent the Monte Carlo uncertainties. The shaded boxes represent the
thermal growing seasons.
FIGURE 6: Annual sum of GPP for PRELES (2012 and 2013) and sap
flux/isotopic (mean 2012 and 2013) method corrected by\(\ \hat{\alpha}\)considering the gm assumption,
gm/\(g_{C\hat{\alpha}}\) = 2.67. Errors bars correspond
to standard deviation and their values are in brackets and letters shows
the statistical differences between the treatment combinations (α =
0.05).
FIGURE 7: Comparison of GPP on the fertilised plot vs the
reference plot in 2012 (green) and 2013 (grey) with,
GPPiso/SF for gm/\(g_{C\hat{\alpha}}\) =
2.67 assumption (A), and GPPPRELES (B). The black dashed
line represents the 1:1 line.
FIGURE 8: Annual sum of GPP for sap flux/isotopic (mean 2012
and 2013) method corrected by\(\ \hat{\alpha}\) considering the
gm assumptions, gm/\(g_{C\hat{\alpha}}\)= 2.67, gm = 0.31 mol CO2m-2 s-1 and infinite
gm. Errors bars correspond to standard deviation and
their values are in brackets and letters shows the statistical
differences between the treatment combinations (α = 0.05).