Effects of vegetation treatment methods on the growth of various acacia species plantation forests in Quang Ninh province
Keywords:
Acacia mangium, Acacia auriculiformis, Acacia hybrid, vegetation treatment before planting for, Quang Ninh provinceAbstract
Vegetation treatment before planting forest is one of the important technical measures, if vegetation treatment is unreasonable, it will reduce productivity and quality of forests, reduce soil fertility and affect long - term and sustainable business. Within the scope of this study, three experimental vegetation treatment formulas were applied for Acacia mangium, Acacia auriculiformis and Acacia hybrids, including: 1/ Comprehensive clearance and even organic materials spread on the area; 2/ Comprehensive clearance and collect organic materials into beds along contour lines; 3/ Selective clearance in strips (1 m - wide un - cut strips, 2 m - wide cutting strips). After 2 years of planting, the growth ability of A. mangium was significantly different with different vegetation treatment formulas, namely higher growth with comprehensive clearance treatments, diameter at breast height (D1,3) was from 6.35 - 6.97 cm, total height (Hvn) from 6.54 to 7.12 m; meanwhile, in the selective clearance treatment formula, the mentioned values were only 6.09 cm and 6.30 m respectively. After 2 years of planting, the growth of Acacia auriculiformis with various treatment formulas was not significantly different, the diameter ranges from 5.03 - 5.52 cm, the height ranges from 6.02 - 6.32 m. Similarly, after 2 years of planting, Acacia hybrid growth with treatment formulas did not differs much, diameter (D1.3) from 6.81 - 7.16 cm, height (Hvn) from 7.12 - 7.72 m. Therefore, with the current status of poor natural forests, the height of vegetation below 7 m, to plant Acacia mangium, it is necessary to to apply comprehensive vegetation clearance and even organic materials spread on the area or collect organic materials into beds along contour
lines (no burning), for afforestation of Acacia auriculiformis and acacia hybrid, all three methods of vegetation treatment can be applied, but selective clearance in strips should be used because of greater benefits it brings
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