黄土高原区由于水土流失严重,大部地区都为干旱贫瘠的黄土覆盖。为了使这些地区尽快恢复植被、必须选择一些耐干旱、瘠薄的先锋树种进行营造。为此,我们对晋南的树种资源特别是灌木资源进行了普查,以便做到选择树种时有的放矢不走弯路。而对树种繁多的灌木林照其生态学特征及其经济价值划分类型就显得必要了。一、树种类型划分的理论依据 1、树种的抗逆性大小是划分类型的首要依据。黄土高原不良的造林立地条件,要求所栽树种必须能成活并能正常生长发育,这样,树种就必须具备强大的抗逆性,以适应不良的 Due to serious soil erosion in the Loess Plateau, most areas are covered by arid and infertile loess. In order to restore vegetation to these areas as soon as possible, some drought-resistant and infertile pioneer trees must be selected for construction. To this end, we conducted a survey of tree resources in Jinnan, especially shrub resources, in order to achieve the goal of choosing tree species. However, it is necessary to classify the types of shrubs according to their ecological characteristics and their economic value. First, the theoretical basis for the classification of tree species 1, the size of the tree’s resistance is the primary basis for the type of division. Poor afforestation site conditions in the Loess Plateau require that the planted tree species must survive and grow normally, so the tree species must possess strong resistance to adapt to poor