Introduction and Provenance Test of Acacia crassicarpa

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.