林分中只有一个树种的叫纯林,有两个以上树种的叫混交林,林种根据其特性有阴阳、针阔、乔灌、耐寒喜温、耐旱喜湿之分。按照适地适树的原则,因地制宜地进行树种混交,就能培养生长比较稳定、优质高产、防护效益大的林分,更好地发挥 There is only one species of forest called pure forest, there are two or more species called mixed forest, forest species according to their characteristics are yin and yang, acuminata, arbor, cold and warm, drought and wet points. In accordance with the principle of suitable tree, according to local conditions for species mixed, we can cultivate more stable growth, high-quality and high yield, protection of the benefits of a large forest stand, to better play