Tropical forestry systems based on natural regeneration are mainly concerned with the condition of the remaining stand and aim at an increase in wood production of commercial species. Commercial logging often results in a high level of damage to the remaining forest stand. In this project the role of lianes is studied. The effects of prelogging climbercutting treatments on the damage to the residual forest stand is monitored.l Also studies on the growth and development of characteristic liana species, as well as wood characteristics (e.g. anatomy, strength) are carried out. The invasion possibilities of fast growing lianas after forest opening (under natural as well as logging conditions) is studied.