1. THE IMPACT OF TREES GROWTH CONDITIONS ON CELL WALL STRUCTURE AND CHEMICAL COMPOSITION ULDIS GRINFELDS, ARNIS TREIMANIS, INESE SABLE

2. 1 6 2 3 7 4 5 Locations of sampling: 1 - Auce, 2 - Iecava, 3 - Ieriķi, 4 - Madona, 5 - Malta, 6 - Šķēde, 7 - Valmiera Spruce, Aspen Aspen, Hybride Aspen Spruce Aspen Spruce, Aspen, Hybride Aspen Pine, Spruce, Birch, Aspen

3. 3 Age of tree, years Stem diameter, mm Ieriķi, Aspen Auce, Aspen Talsi, Aspen Iecava, Aspen Iecava, Hybrid Aspen 0 20 40 60 80 100 120 140 160 180 0102030405060 Forest land Agriculture land Tree growth speed

4. Wood density, kg/m 3 Wood density Forest land Agruculture land

5. Birch measurements by SilviScan

6. Fibre length, mm Kraft pulp fibre length Forest land Agruculture land

7. Hansheets tensile index, Nm/g Handsheets tensile strength (made from unbeaten kraft pulp) Forest land Agruculture land

8. Specific wood consumption, m 3 /t Specific wood consumption Forest land Agruculture land Q – Pulp yield  - wood density

9. It is possible to a certain extent foretell the main features of wood of specific tree species if forest growth conditions are known. Thank you!