Relevance of the problem. Forest compartment under the conditions of intensive forestry is the main unit of management and inventory (Antanaitis, 1961; Franklin, 2001). Regular, every 10 years, standwise forest inventory requires great expenditures on compartment delineation and their depicting in cartographic material. Different executives, guided by the same standards, but without objective forest compartment delineation methodics, may divide one and the same object into compartments in different ways (Rutkauskas, Kenstavičius, 1978). Therefore, the variability of forest compartment boundaries is artificially increased. Under the absence of clear boundaries between compartments in the forest and considering that the whole forest is homogeneous, compartment characteristics are usually ascertained ignoring their peculiarities at the edges. This comprises preconditions for the appearance of systemic forest inventory deviations (Антанайтис и др., 1975; Kuliešis, Kasperavičius, 2000; Brassel, Lichke, 2001). The accuracy of cartographic material and the influence of deviations on estimation reliability of forest resources are not evaluated (Gemmell et al., 1991; Fish, 2000; Franklin, 2001). Compartment edges, occupying in the forests of the country almost one third of the whole area of stands, are important not only from inventory, but also from forest stand growing viewpoint. What are wood increment losses, or what additional increment may be obtained due to differing growth... [to full text]