Volume of Poplar "I-214" (P. x euram. (Dode) Guinier cv. "I-214")

1990

S. 107-122

3 Abb., 2 Tab., 8 Lit. Ang.

Unselbständiges Werk

200053090

Erdeszeti Kutatasok 1990 ; 80-81, S. 107-122

Based on the data of 596 and 769 trees measured, the volume function of poplar "I-214" was determined on large wood (over 5 cm) and on total wood, respectively. The function values are indicated in Tables 1 and 2. When controlling the function, we did not find it correct enough in the height category from 5 to 8m. Therefore, for this category the data of robusta poplar were taken over into the volume table of poplar "I-214". The correlation coefficient between the volume of the individual sample trees calculated by the function and their actual volume was 0.993 for large wood (over 5 cm) and 0.9937 for total wood. It was stated that 95% of the volume of sample trees calculated by the function were less by 20% than those of the volume table. The sum of the positive and negative differences came close to nought. Through controlling, it could be established that the volume function and the volume table suit the exacthess prescribed and thur are applicable in practice. The per cent of small wood (under 5 cm) decreases with the increase in diameter and height, as in case of other species. The data of the new volume table slightly differ fromthose of robusta poplar volume table to DBH of 20-21 cm, but over 35 cm the difference is more than 5% (e.g. 10% for DBH of 60 cm). That is why the introduction of this new table is necessary. The values determinable by the volume function formulated by the Forest Research Institute, are, in general, greater than the corresponding data of the Romanian and Yugoslavian "I-214" volume table, at the same time, they are less than those of the Italian volume table, in spite of the fact that only wood volume over 10 cm are included in that table.