大叶相思(Acacia auriculaeformis)是优良造林树种。它原产在巴布亚新几内亚等地热带稀树草原地区,适应性强,在强酸或强碱性土壤上均能生长,我国1961年从国外引入,现已在广东省各地广泛栽培。大叶相思生长迅速,易于发挥造林效果,实生苗最初几年,年平均生长高1—2米,树干增粗1—3厘米。十年生以后,高生长速度放慢,但粗生长加快。如广东省林科所(广州市郊龙眼 Acacia auriculaeformis is a good afforestation tree species. It is native to Papua New Guinea and other tropical savannas regions. It has strong adaptability and can grow in strong acid or strong alkaline soil. Our country was introduced from abroad in 1961 and is now widely cultivated in Guangdong Province. Acacia grows rapidly, easy to play afforestation effect, the first few years of seedlings, the average annual growth of 1-2 meters high, trunk thickening 1-3 cm. Ten years later, high growth slowed down, but coarse growth accelerated. Such as Guangdong Forestry Branch (Guangzhou suburb of the longan