STRUCTURAL CHARACTERISTICS OF NATURAL FOREST RECOVERY THE STATES OF III A1, III A2 AT BEN EN NATIONAL PARK, THANH HOA

Abstract

Ben En National Park is the home to typical ecosystems of tropical forests, of which
the restored natural forest ecosystem covers an area of 1,855.44 hectares, accounting for
15.8% of the total land area. There are forests of the Garden. Statistical results show that
the high tree layer in forest status IIIA1 and IIIA2 has the diversity of the species participating
in the composition formula, but there are no ecologically dominant species pants. The forest
ecosystem is highly sustainable and adaptable to the environment as clearly shown in the
high tree stratum according to the important index IV%. The number of tree species involved
the composition formula is very low, only 3-4 species; the species that do not participate in the composition formula account for a high quantity (from 69 to 73 species). The average
tree densities of 2 staties IIIA1 and IIIA2 are 334 trees/ha and 400 trees/ha, the forest
reserves are 91.01 m 3 /ha and 129.43 m3 /ha, respectively. The rule of distribution of tree
numbers according to peak height in both forest states tends to be left skewed according to
the Weibull distribution. Trees regenerated in both forest states with density from 6,000 to
6,640 trees/ha, with good quality accounting for more than 95%, the rate of trees
regenerated from seeds was of 98-99%, regenerated plants having growth potential
accounts for 46.7% - 53% of the total number of regenerated trees.