Hybrid acacia is a fast growing tree and suits the many ecological conditions of Viet Nam. In recent years, there is a phenomenon of broken stems of hybrid acacia trees starting with 4 year old trees and continuing through maturity. The initial research on the reasons for this phenomenon of broken tree stems at Ham Yen station shows the following: The wider trees have crown diameters (Dt) and their broken stem capacities are higher. Also if the branches are bigger, their broken stem capacities are found to be higher. The factors of diameter at breast height (D1.3) and total tree height (Hvn) also influence these capacities. The higher the breast height D1.3 and tree total height (Hvn), the broken stem capacities are shorter. The deep reasons of the phenomenon of broken stems are due to the fact that hybrid acacia trees grow so fast, especially the growth of crown diameter that makes tree develop unproportionally. However, the direct reason is due to windstorms.
Tran Thi Quyen, Ngo The Long, Phung Dinh Trung
Hung Vuong University
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