Assessing status and potential of Acacia crassicarpa development in sandy area of Quang Tri province coastal zones

Abstract

Sandy area of Quang Tri province coastal r egions has the area of about
34,152ha, accounting for 7.2% of the natural one of the province, in which
white golden sand dune and sand beach (Cc) area is 21,089ha, accounting
for 61.8%; sandy soil area is 10.410ha, accounting for 30.5%; golden sand dune (Cv) area is 2,647ha, accounting for 7.8% and riverside sand (Cb) area is 5.4ha, accounting for 0.02% the total area of sand, sand dune and sandy beach zones. Sandy areas located in 25 coastal communes of 4 provinces Vinh Linh, Do Linh, Trieu Phong and Hai Lang. The area of uncultivated sandy zones is relatively large, accounting for 29.3% (10,020ha) of the total area of the province’s coastal sandy zones. The area of forests for windbreak and sandbreak is 16,428ha, Acacia auriculiformis and Casuarina equisetifolia are mainly planted on white sand type, shifting sand dunes so they poorly grow and has low capacity of protection. A trial of Acacia crassicarpa to grow in the interior - field sand area has been carried out since 2000, so far 23ha of Acacia
crassicarpa has been planted, in which 17ha in Trieu Phong and 6 ha in Gio Linh. Acacia crassicarpa has been well grown and developed, the survival rate after 27 months is over 90.0%. The tree height and stem diameter is significantly correlated by the equation: Hvn = 0.109 + 0.365*Dgoc (R = 0.69, p - value < 2.2e - 16). Based on the identification of key factors affectiing the plant growth and development and production potential when planted in coastal sandey region, the research has evaluated that the development potential of Acacia Crassicarpa for reforestation in coastal sandey region of Quang Tri is relatively hight, the appropriate medium level (S2) for Acacia crassicarpa mainly on golden white sand (Cc), about 21,089ha and golden sand (Cv), about 2,647ha