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In Hungary increasing emphasis is put on the research regarding the naturalness of forests, because the so-called biosphere crisis – the global level degradation of our biotic environment – seriously aff ects the forest communities. Th is process can most spectacularly manifest itself in the decrease of forest size. Th e health status of forest stands is usually measured by visual measurements, but it is hard to eliminate subjective errors. Because of these, we carried out instrumental measurement with a 3D Acoustic Tomograph in the Kőszeg Mountains, the Börzsöny Mountains and in the Zemplén Mountains. Th e monitoring of health status was made in sessile oak stands which were older than 100 years in 2015. We found the best health status in the stands of the Kőszeg Mts. Th e maximum level of decay was found in the higher layers in relation to ground level because of the frost damage destroying the stands of the Börzsöny Mts. On the other hand, we experienced the highest decay in the lower levels of trunks regarding stands of the Zemplén Mts; this level of deterioration was continuously reduced towards the higher levels. Th e two diff erent trends are attributable to the site conditions and the origin of the stands.

Instrumental measurement of health status of old natural sessile oak stands