Dokładność określania bieżącego przyrostu miąższości drzewostanów sosnowych stosowanego w Systemie Informatycznym Lasów Państwowych

Increment of growing stock is one of the key indicators useful in forest management. In the State Forests in Poland, up to now it is estimated using growth and yield tables elaborated a century ago. Paper presents results of study concerning current annual increment of Scots pine stands. Basing on repeated measurements of stand volume increment was estimated to 14.5 m³./ha for stands in age from 37 to 60 years and to 6.2 m³./ha for stands aged over 140. Increment estimated by measurements was 30−80% higher than increment evaluated using growth and yield tables for particular age classes.