RESEARCH ON GROWTH, YIELD AND AGE OF MATURITY FOR Acacia auriculiformis PLANTATION IN BU DANG DISTRICT, BINH PHUOC PROVINCE

Abstract

Research on growth, yield and age of maturity for Acacia auriculiformis plantation in Bu Dang district, Binh Phuoc province. On based the monitoring results of 02 experimental Acacia auriculiformis planting models (planting model from seeds and planting model from cuttings of clones AA1 and AA9). The afforestation from 2017 - 2023 with a planting density of 1,660 trees/ha at Nghia Trung forestry experimental Station, district Bu Dang, Binh Phuoc province. The growth data is collected in September every year. Initial results show that the average survival rate of 02 Acacia auriculiformis planting models gradually decreases over the years, The afforestation after 5 years of age has the survival rate reaches 79 - 83%. The growth in the diameter and the height of the Acacia auriculiformis model from cutting to be higher than the Acacia auriculiformis model from seeds. The resuls of after 5 years of age was indicated that Acacia auriculiformis model from seeds and Acacia auriculiformis model from cutting have the growth of the diameter were 11.6 cm and 12.5 cm and the growth of the height were 13.0 m and 13.7 m. The average yields of Acacia auriculiformis model from seeds and cuttings were 20.9 - 22.9 m³/ha/year. The Schumacher function is suitable to model the growth process of diameter, height and volume according to age. Besides, it is predicted that with the age of the maturity in terms of quantity of Acacia auriculiformis forest stands about from 8 to 10 years old and the age of the economic maturity for timber purposes about from 11 to 12 years old.