初中地理课本,有两幅关于山地垂直自然带的插图,为了深入理解教材,提高教学水平,现就图上自然带的垂直分布规律及成因,作一简单分析。中国地理课本下册,八三年三月第四版五十页,有横断山区森林垂直分布示意图。如下图:图上森林垂直分 In junior high school geography textbooks, there are two illustrations of the vertical natural belts in the mountains. To understand the teaching materials in depth and improve the teaching level, a simple analysis is now made on the vertical distribution patterns and causes of natural belts on the map. The Chinese Geography Textbook is published in the fourth edition of March 1983 in the fourth edition, with a schematic diagram of the vertical distribution of forests in the Hengduan Mountains. As shown below: Vertical forest points on the map