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Figure 1. Spectral photon flux density of the simulated sunlight (bro-ken line) and shadelight (solid line), normalized to equal photosyn-thetic photon flux density (I = 225 µmol m−2 s−1).
Figure 2. Dry weight and morphological attributes of silver birchseedlings. (a) Whole-plant dry weight (supply, HN (light, SH (area (W) and (b) whole-plant leafL) versus time
Table 1. Nitrogen concentration in leaves, stems, and roots, and specific leaf area (SLA) of birch seedlings exposed to simulated sunlight (SU) orshadelight (SH), and high (HN) and low (LN) nutrient supply regimes
Figure 5. Nitrogen allocation of silver birch seedlings. (a) Leaf N ratio(Nleaf), (b) stem N ratio (Nstem), and (c) root N ratio (Nroot) versus totalplant dry weight (W)
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