IJSR - International Journal of Scientific Research

Dien Pham Van; Toai Pham Minh; Mung Thi Ha; Huy Quoc Le; Hai Hong Nguyen; Ha Tran Thi Thu

Volume : VI, Issue : VIII, August - 2017

DIVERSITY AND ECOLOGICAL ASSOCIATION OF TREE SPECIES IN SPECIALUSE FORESTS OF VIETNAM: A CASE STUDY IN HUONG SON, HA NOI

Dien Pham Van, Toai Pham Minh, Mung Thi Ha, Huy Quoc Le, Hai Hong Nguyen, Ha Tran Thi Thu

Abstract :

The tree layer is an important component of a forest ecosystem. In order to identify the most important characteristics of tree communities including important value (IV, %); species dominance pattern; species diversity indices and ecological associations of tree species, we conducted 18 sample plots of 1,000 m² each in Huong Son special–use forests, Ha Noi that typically distributed in the study site including six fields. The results showed that among 18 sample plots, there are 6 ones encompassing 35.8% of their species found with an IV of higher than 5% could be considered as ecologically significant species of the forest stands. Four species were found to be dominant in three sample plots with an IV of more than 30%, resulting in a geometric steep slope pattern in the top niche of the dominance diversity (D–D) curve. The species diversity H’ found vary from 1.66 to 2.90 with a low value at sample plots with a geometric dominance diversity pattern and a higher value at plots with a lognormal dominance diversity series. There were up to 11 pairs of tree species found with a similarity of 80%. The results also showed that the 120–tree species found in the studied site were divided into four ecological groups. These results could imply independent, mutual, or comparative relationships among the species.