Abstract:
The study was carried out at different forest plantation sites of the teak (Tectona grandis L.) namely
Mulliyawalai, Theravil, Mankulam and Karripatammuripu in Mullaitivu district of Sri Lanka. The study aims to
interpret the relationship of tree height and canopy diameter over stem diameter at breast height. Teak plantation
from Mankulam site was 13 years old young plantation and Karripatammuripu site was 35 years age old plantation.
Theravil and Mankulm sites were 22 medium and even age old plantation. A total of 757 individuals of teak were
assessed to determine relationship between height and diameter. Even aged planation of Mulliyawalai and Theravil
sites showed a polynomial and linear curves relationship, respectively. High regression value (r2
) was found in tree
height over stem diamter (dbh) in Karripatammuripu site compared to other teak plantation site, showed that
Karripatammuripu was found to be superior and clear site variation to others. In this fitted curves, Mulliyawalai,
Theravil and Mankulam had lower regression (r2
) values. Polynomial curve was best fitted in Mulliyawalai and
Mankulam sites. Linear and logarithmic curves were fitted to Theravil and Karripatammuripu sites. Similarly, the
Mulliyawalai site showed a clear site variation in canopy diameter over stem diameter. The site Mulliyawalai was
found to be superior to others in canopy diameter over stem diameter. Linear curve was fitted to canopy diameter
over stem diameter in Mankulum site. The behavior of the curves showed different pattern and models due to
variation found on age, spacing, and other factors at forest plantation sites of the district in Sri Lanka
