The study was carried out to determine the frequency distribution of trees by diameter classes according to the method of Bruce and Reineke`s alignment with the data of pitch pine (Pinus rigida Miller) and Italian poplar (Populus euramericana Guinier)...
The study was carried out to determine the frequency distribution of trees by diameter classes according to the method of Bruce and Reineke`s alignment with the data of pitch pine (Pinus rigida Miller) and Italian poplar (Populus euramericana Guinier) which are prepared for the purpose of yield table construction. The results obtained are summarized as follows: 1. All through the tree species studied, when their diameters were larger, their distribution range became wider, while the percentage of their distribution frequency became lesser. 2. As for frequency percentage of trees in an average D.B.H. of stands, it became smaller when average D.B.H. of the stand is larger: the percentage of pitch pine stand is 36.2 and that of Italian poplaris 29.0. 3. In case of smaller D.B.H. under the average, the larger their D.B.H. became, the lesser the cumulative frequency percentages became.