Structure, aboveground biomass and biodiversity of selected natural forest states in the ecological restoration zone of the Hon Ba Natural Reserve

Abstract

The ecological restoration zone of Hon Ba Nature Reserve covers approximately 9,553.5 hectares and comprises a variety of characteristic evergreen broadleaf forest states. A field survey was conducted using temporary standard plots (1,000 m², 33.3x30.0 m) established in typical forest states of the study area to determine several forest characteristics, including forest structure, biomass, and biodiversity. The results indicated that the distribution of trees by diameter class (n/D_1.3) and height class (n/H_vn) was similar among forest states, exhibiting a concentration in small diameter and height classes. Standing volume ranged from 36.7 to 221.7 m³/ha, while biomass ranged from 30.16 to 247.54 tonnes/ha. The total number of forest tree species observed in the forest states ranged from 12 to 36, of which 6 to 10 species had high ecological significance. The study area exhibited a notable decline in stand density, volume, species richness, and biodiversity index in comparison to general regional levels. This suggests that the study area has confronted considerable challenges pertaining to forest restoration and development, particularly with regard to the recovery rates of forest states distributed within the ecological restoration zone.