Structural characteristics of natural forest with distribution of Tarrietia javanica Blume in North Central region

Abstract

The results of structural characteristics of natural forest with distribution of Tarrietia javanica Blume in Quang Binh and Thua Thien Hue provinces showed that density of Tarrietia javanica Blume distributed in the natural forests ranges from 6 to 16 trees/ha, accounted for 0.8 to 2.1% of total trees, corresponding to the base area is 0.1 - 0.4 m 2 /ha and yield is 2.0 - 39.1 m 3 /ha. In the natural forest, Tarrietia javanica Blume did not participate in the dominant layer and had a very low IV% index from 0.5 to 2.1%. Forest coverage is from 0.52 to 0.78. The number of tree species in the two surveyed provinces ranges from 58 - 77 species (an average of 67 species). Tarrietia javanica Blume has not yet clearly shown its ecological role in the stand and is not included in the species composition formula. The rich evergreen forest in Quang Binh has a dominant tree species group. The distribution N/D1,3 has a continuously decreasing pattern or has a left-skewed peak and the number of trees decreases when the diameter class increases; The distribution N/H vn has the pattern of a left-skewed speak and the number of trees decreases when the height level increases. The distribution pattern of forest trees on forest floor in the North Central region has random and equal forms. Tarrietia javanica Blume has a random relationship with other dominant species in the stand.