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Appendix S1. Allometric relationships to estimate aboveground woody biomass. According to Norby et al. (2001) aboveground woody biomass [BM (g)] was estimated as BM=a1×Σ1nVn, where Vn is the volume per shoot and n is the number of shoots per stool. The volume was calculated with V=1/3×π×r2×h, where r is the radius of the shoot at 0.2 m above stool level and h is the total height of the shoot. To obtain estimates for V of nonharvested shoots, the relationship between height and diameter (d) was modeled with log hn=a2×log dn. Each relationship was established with n=24 harvested shoots.

Appendix S2. The major absorbance peaks in the spectrum of stem wood of Populus×euramericana grown on the EUROFACE site harvested in the growing season of 2003 (see Fig. 1a)

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