一、前言相思类树种,有灌木或乔木约1100种,多分布在热带及亚热带干旱地区。该类树种,具生长快、适应性强,用途广等特点,因此,许多国家对这类树种的引种工作很重视,较易引种成功,对改良土壤及解决木料、燃料、肥料及饲料等,均有显著效益。 I. Introduction Acacia species, there are about 1,100 kinds of shrubs or trees, and more distributed in tropical and subtropical arid areas. Therefore, many countries attach great importance to the introduction of such tree species, and are more likely to be introduced successfully. For improving the soil and solving the problems of wood, fuel, fertilizers and feedstuffs, etc., these tree species are characterized by rapid growth, strong adaptability and wide application. Have significant benefits.