A contribution to the autecology ofphragmites communis Trin. 1. Physiological heterogeneity of leaves

The plantPhragmites communis was subject to an analysis of physiological gradients along the leaf blade and level of insertion of separate leaves. The gradients were established in the following aspects: fresh weight, dry matter, specific leaf area, water content, water saturation deficit and its resaturation, rate of desiccation and photosynthetic capacity. Indistinct gradients under normal conditions become more marked in extreme circumstances. The significance of leaf heterogeneity for all sorts of eco-physiological analysis of the plant under study was discussed.