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银合欢(Leucaena leucocephala)原产美洲,六十年代在广东就有引种。四川省凉山州林业局,1982年从外地引入种子,5月份田间撒播育苗,出苗后移栽到塑料袋内,苗高30厘米左右,6月雨季时带袋移栽,造林后成活率高,种植当年株高达到2.2米,地径2厘米左右;4年生树高达到8.7米,胸径达到8.5厘米。银合欢具有极强的萌发能力,据试验,伐桩萌条当年高2—2.5米。银合欢主根长,根系发达,具有根瘤,能固定大气中的氮素,因此,耐干旱、耐热和适应较贫瘠的土壤,但在沙壤土中生长最好。沿金沙江的宁南、金阳、会东等县,现已造林近2万亩,普遍长势良好。在金沙江干热河谷地区的造林
Leucaena leucocephala originated in the Americas, the sixties in Guangdong have introduced. Liangshan Prefecture Forestry Bureau of Sichuan Province, introduced seeds from the field in 1982, sowing seedlings in the field in May, after transplanting to plastic bags after emergence, seedling height of about 30 cm, the rainy season in June with bags transplanting, high survival rate after afforestation, Planting year when the plant height reached 2.2 meters, about 2 cm in diameter; 4-year-old tree up to 8.7 meters, 8.5 cm in diameter. Acacia has a very strong ability to germinate, according to the test, cutting pile sprigs that year high 2-2.5 meters. Acacia main root length, developed root system, with nodules, can fix the nitrogen in the atmosphere, therefore, resistant to drought, heat and adapt to the more infertile soil, but the best growth in sandy loam soil. Along the Jinsha River, Ningnan, Jinyang, Huidong and other counties, nearly 20,000 mu of afforestation have now been established and the general situation is favorable. Afforestation in the dry-hot valley area of the Jinsha River