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厚荚相思的引种及种源试验*

Introduction and Provenance Test of Acacia crassicarpa

  • 摘要: 厚荚相思于1985年从澳大利亚引种,8年引种及种源试验表明厚荚相思生长迅速,在广东湛江市8年生高达12m,胸径12.8cm,超过大叶相思和马占相思.主干较通直,适应热带砖红壤和沿海沙土生长,能耐盐风和茅草竞争,未发现严重病虫害.由于它为浅根性树种,故抗风力较弱.种源试验还表明,产自巴布亚新几内亚的种源较澳大利亚昆士兰州种源生长快且干形较通直.现已利用巴布亚产优良种源营造母树林,3a可开花结实.

     

    Abstract: Acacia crassicarpa was introduced in 1985 to South China.8-year species trial of A.crassicarpa shows that it is a fast-growing tropical legume tree without serious insect and pest damage.It is a suitable tree species for pulp and timber plantation.It could be planted in the vast tropical and southern subtropical regions in China where the mean annual temperature ranges 21~24℃,mean annual rainfall 1000~2000mm without frost.The most suitable sites may be low hills,mountains and the coast sandy soils where typhoon damage is not serious.The most suitable seed sources of A.crassicarpa come from the low elevations of PNG.The MAI of height is 1.2~1.9 m and MAI of DBH is 1.7~2.9cm. It starts flowering and bearing fruit at age 4~5 year.1000 wt.of seeds is 22 g.A.crassicarpa is a tree with shallow root system whose root system concentrates on the upper 10~45 cm layer of the top soil.It is not wind resistant.The fresh leaves of A.crassicarpa contain 2.168% N,0.094% P,0.146% K,0,424% Ca,0.172% Mg.It can enrich soil because it is a nitrogen fixing species.

     

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