RESEARCH SELECTION DOMINANT TREE Altingia siamensis CRAIB IN TWO PROVINCES OF SON LA AND DIEN BIEN

Abstract

The research results have selected 2 stand plus tree Altingia siamensis Craib, which is Na Tau commune, Dien Bien Phu city, Dien Bien province, the area of ​​2.5 hectares grown pure species since 2009 density Initially, 1,600 trees/ha of current density 1,030 trees/ha of the wrong fruit trees accounted for 60% of the total number of trees of lam part and Chieng Bom commune, Thuan Chau district, Son La province, an area of ​​1 ha. Recovery after the fields in 2009, the initial density of 500 trees/ha currently density is 415 trees/ha, the number of wrong fruit trees accounts for about 50% of the trees in the forest. According to TCVN 8755-20217-Forestry varieties have recruited 34 plus tree Altingia siamensis Craib are over 10 years old and for 2 years, this is the source of propagation materials to produce seedlings for afforestation. Of which, 30 plus tree was chosen in Na Tau commune, Dien Bien Phu city, Dien Bien province and 4 plus tree were chosen in Chieng Bom commune, Thuan Chau district, Son La province. The plus tree Altingia siamensis Craib with a diameter of 19.4 - 23.9 cm on average reached 21.9 cm, exceeding the diameter compared to the average forest of 34.2%; The soaring height of 14 - 16 m average reaches 15.1 m to the height of the average part of 13.9%.