PRODUCTIVITY AND SANITARY CONDITION OF MIDDLE-AGED RED OAK STANDS

Abstract

This study analyzed the productivity and sanitary condition of middle-aged red oak (Quercus rubra L.) stands. Fourteen red oak stands were selected for the study across three different regional divisions: Prienai, Trakai, and Druskininkai. All examined stands were classified into three conditional age groups: 60–65, 70–75, and 80–85 years.

To achieve the study’s objective, quantitative indicators of red oak stands were analyzed, including tree height, diameter, branch thickness, crown length, branchless stem section, and volume. Additionally, qualitative indicators such as stem straightness and Kraft class were evaluated. The sanitary condition of the stands was also assessed.

The analysis of the results revealed that the highest average height (27 m) and diameter (30 cm) were observed in 80–85-year-old red oak stands. The highest proportion of crooked trees (34.3%) was recorded in 70–75-year-old stands. The greatest number of trees with thick branches (26.5%) was found in 60–65-year-old red oak stands. The best tree development indicators were identified in 80–85-year-old stands, where the proportion of suppressed trees was the lowest. The longest crowns (15 m) and the largest branchless stem section (12 m) were observed in 80–85-year-old stands. The highest average volume (597 m³/ha) was achieved in 80–85-year-old stands. All age groups of stands exhibited a moderate sanitary condition.