1. Seasonal variation of maximum photochemical efficiency in boreal Norway spruce stands

   • T. Lundmark
   • Johan Bergh
   • Andres Koppel

   ORIGINAL ARTICLE Pages: 63 - 67

2. Element content in leaves of birch (Betula verrucosa Ehrh.) in an air polluted area

   • P. Hrdlicka
   • E. Kula

   ORIGINAL ARTICLE Pages: 68 - 73

3. Regeneration of bark and formation of abnormal birch wood

   • Ludmila L. Novitskaya

   ORIGINAL ARTICLE Pages: 74 - 79

4. Light attenuation in a 14-year-old loblolly pine stand as influenced by fertilization and irrigation

   • D. A. Sampson
   • H. Lee Allen

   ORIGINAL ARTICLE Pages: 80 - 87

5. Leaf defoliation of tropical dry forest tree seedlings – implications for survival and growth

   • Karin Gerhardt

   ORIGINAL ARTICLE Pages: 88 - 95

6. Provenance variation in morphology and leaflet anatomy of Parkia biglobosa and its relation to drought tolerance

   • Z. Teklehaimanot
   • J. Lanek
   • H. F. Tomlinson

   ORIGINAL ARTICLE Pages: 96 - 102

7. Ethanol synthesis, nitrogen, carbohydrates, and growth in tissues from nitrogen fertilized Pseudotsuga menziesii (Mirb.) Franco and Pinus ponderosa Dougl. ex Laws. seedlings

   • R. G. Kelsey
   • Gladwin Joseph
   • Elizabeth A. Gerson

   ORIGINAL ARTICLE Pages: 103 - 111

8. Differential energization of the tonoplast in suspension cells and seedlings from Picea abies

   • Wolfgang Pfeiffer

   ORIGINAL ARTICLE Pages: 112 - 116