RESEARCH ON SELECTION PLUS TREE (Altingia siamensis Craib) IN SOME PROVINCES OF NORTHERN MOUNTAINOUS AND CENTRAL HIGHLANDS

Abstract

Altingia siamensis Craib is a large, multi-purpose native tree species, widely distributed in Vietnam. Therefore, it is necessary to study and select plus trees of this tree species to provide a source of seeds for seedling propagation and planting of large timber forests. This study was conducted to select the plus trees from both natural forests and planted forests in six provinces of the Northern mountainous and the Central highlands, in which from natural forests were in Son La, Dien Bien, Lai Chau, Lao Cai and Gia Lai provinces, and from planted forests was in Yen Bai province. The research methods were based on Vietnam National Standard TCVN 8755:2017. The results of research revealed that total of 60 plus trees were completely selected including Son La province (10 plus trees) with diameter at breast height (DBH) from 23.2cm to 78.9cm, total height from 12.5cm to 30.5m; Dien Bien province (15 plus trees) with DBH from 22.3cm to 48.7cm, total height from 15.5m to 26m; Lai Chau province (2 plus trees) with DBH from 81.2cm to 90.8cm, total height from 25.0m to 26.0m; Lao Cai province (8 plus trees) with DBH from 46.8cm to 61.8cm, total height from 14.5m to 24.5m; Gia Lai province (5 plus trees) with DBH from 21.9cm to 26.4cm, total height from 18.5m to 22.5m and Yen Bai (20 plus trees) with DBH from 29.3cm to 63.7cm, total height from 16.5m to 23m. The selected plus trees all flowered and beared fruits, with good fruit quality. These are good sources of seeds for seedling propagation to plant Altingia siamensis Craib forest in the Northern mountainous and Central highlands provinces.