Aboveground wood and foliage biomass after three growing seasons.

Air warming (AW), drought (D) and soil effects on shoot biomass (g tree−1) at the end of the experiment in autumn 2009. Data of the different provenances were pooled before calculating means and SE (n = 8). Different letters indicate significant differences between respective treatment means on the same soil (P<0.01). An asterisk (*) indicates significant differences between acidic and calcareous soil for the same treatment. More biomass and shoot length data are presented in [29] and [27].