3种相思在肇庆造林生长对比

对厚荚相思(Acacia crassicarpa)、马占相思(A.mangium)、肯氏相思(A.cuninghamia)进行引种造林试验.结果表明,在粤西造林后1~4 a,厚荚相思树高生长最快,肯氏相思次之,马占相思最慢,分别为5.57、4.92、4.08 m;但马占相思造林后第4年至第5年生长明显加快,造林后5 a,马占相思树高、胸径生长最快、生物量最大,分别为7.01 m、7.69 cm、32.1 kg,厚荚相思次之,分别为6.80 m、5.77 cm、16.72 kg,肯氏相思最差,分别为5.32 m、4.21 cm、13.48 kg.马占相思和厚荚相思适宜在肇庆市及粤西南地区推广.

Afforestation Comparison of Three Acacia Species in Zhaoqing City

The introduction and afforestation of Acacia crassicarpa, A. mangium and A. cuninghamia werecarried out in this experiment. The results showed that, after 1~4 years afforestation in western Guangdong, thehighest growth rate of A. crassicarpa was the highest, followed by A. cuninghamia and A. mangium, and the treeheight of them was 5.57, 4.92, 4.08 m respectively. However, A. mangium grew the fast from the fourth to fifthyear. After 5 years of afforestation, A. mangium presented the highest growth rate in both height (7.01 m) andDBH (7.69 cm), as well as the largest biomass (32.1 kg). A. crassicarpa ranked the second with 6.80 m in height,5.77 cm in diameter and 16.72 kg in biomass. A. cuninghamia was the last, with 5.32 m in height, 4.21 cm indiameter and 13.48 kg in biomass. In summary, A. crassicarpa and A. mangium should be promoted in Zhaoqingcity and western Guangdong.