STRUCTURE, SPECIES DIVERSITY AND ABOVEGROUND BIOMASS OF EVERGREEN BROADLEAF FORESTS IN PHIA OAC - PHIA DEN NATIONAL PARK

Abstract

Forest ecosystems play an important role in global carbon sequestration. However, the relationship between forest structure, biodiversity and aboveground biomass carbon (AGB) is still not well understood in Phia Oac - Phia Den National Park. Six study plots (ONC) with an area of ​​10,000 m² belonging to two permanent ecological research plots (ODV) numbers 12 and 13 were used for data collection. In each ONC, species name, total height (H_vn) and diameter at breast height (D_1.3) of all woody trees with D_1.3 of 6 cm or more are identified and measured. The results showed that a total of 1,759 individual trees belonging to 62 species and 32 families were recorded in 02 ODV. In particular, species richness, number of families and diversity indices such á Shannon-Wiener, Simpson, Pielou evenness of ODV 13 were higher than that of ODV 12. AGB of ODV 13 was also higher than ODV 12, showing that AGB is linked to species diversity in 02 ODVs. The relationships between D_1.3 - H_vn of the ONCs were expressed by the R² coefficient, which ranges from relatively tight (0.66) to tight (0.84). The correlation function was selected with the largest R² value and the smallest AIC value to limit the least deviations in estimating carbon stocks in these forests. This study contributes to clarifying the relationship between forest structure and biodiversity with AGB in evergreen broadleaf forests in the study area.