Some characteristics of natural forest structure wich have Amentotaxus argotaenia (Hance) Pilger in Moc Chau district, Son La province

Abstract

Research on the characteristics of natural forest structure with narrow
Amentotaxus argotaenia (Hance) Pilger distributed in 3 elevations: 1,000 – 1,300m, 1,300 - 1,600m, 1,600m above the sea level in Moc Chau district, Son La. The study area is quite diverse with many different species of tree, ranging from 17 - 26 species/OTC, of which 5 to 9 species participate in th composition fomular of the IV% index, while 12 - 17 species do not participate in this fomular; Amentotaxus argotaenia (Hance) Pilger is distributed at the belt height of 1,300 - 1,600m and larger than 1,600m, in small numbers, ranging from 4 - 6 plants/ha. The structure of the second layer of natural forest, which has Amentotaxus argotaenia (Hance) Pilger, has three layers of canopy.
In dominance layer, the number of trees is sparse (1 - 8 trees/ha) and the number of trees under the canopy is low (8 - 56 trees/ha) and mainly the main canopy (141 - 173 trees/ha). The level of forest cover is between 0.6 and 0.7. The Weibull distribution is best suited to simulate the distribution of tree numbers by diameter classes and height. Amentotaxus argotaenia (Hance) Pilger is associated ecologically with the species of Cephalotaxus mannii, Machilus odoratissima Ness, Castanopsis fissa Rehd.et Will