Fig. 2.

Above-ground biomass (A, B) and specific leaf area (C, D) of invasive populations of Impatiens glandulifera in a greenhouse experiment. Plants were exposed to eight treatments in a full factorial design, including high and low shade, competition by a common grass species (Arrhenatherum elatius) and no competition, as well as low and high soil acidity. Plant material originated from three habitat types, i.e. alluvial deciduous forests (DF), fallow meadows (FM) und coniferous forests (CF). Most groups represent 15 replicates, except five cases where only 14 replicates were available.