Study the growth characteristics of Paramichielia braianensis Dandy in Kon Ha Nung, Tay Nguyen

Abstract

The Paramichelia braianensis Dandy is a large evergreen tree, 30-40m high, 40-70cm in diameter. This species is endemic to Vietnam, found only in the Central Highlands provinces from Gia Lai, Dak Lak to Lam Dong (Di Linh, Braian). The tree is distributed at the height of 600 - 1.000m in stands of evergreen broardleaved forest natural or coniferous forest. In the surveyed stands in Kon Ha Nung, the Paramichielia braianensis appearance ranged from 8 to 36 trees/ha, accounting from 1.7 - 6.2% of the total number of individuals in the surveyed stands. The average diameter is from 27.58 -65.11 cm, and the average height is from 17.60 - 29.41 m, higher than the mean from 114.3 - 243.2% in diameter and from 99.8 - 156.4% of the average height of the stand. The average basal from 1.19 - 14.72 m2, accounting from 2.6 - 28.8% of the total stand basals. The average volumes from 13.1 - 304 m3/ha, accounting from 2.4 - 37.4% of total stand volumes. The number of new species emerging from the regenerated tree species
ranged from 2 - 30 trees/ha (2008) and 59 - 99 trees/ha (2012). At the time of 2004 and 2017 no new species emerged from the nearby regenerated tree. The average basal of new individuals entering the tree floor ranged from 0.02 - 0.30 m2/ha and the average volumes of replanted forest ranged from 0.26 -4.64 m3/ha.