中文摘要：

植被尤其是森林在人类的生存和发展过程中，具有不可替代的地位和作用．汾河上游流域，作为黄土高原生态脆弱区一个独立的流域单元，是太原市唯一的水源涵养地和供水区，其森林植被状况的好坏，直接影响到其本身的生态安全和对汾河流域的大城市的生态屏障作用能否正常发挥．所以应用历史地理学的研究方法对汾河上游流域的森林变迁的历史，追根溯源，进行研究，目的是找出人类活动对植被影响的规律，从而能够采取行之有效的方法恢复植被，为汾河上游流域的生态安全提供可靠的保障．

英文摘要：

The vegetation in particular forest in humanity＇s survival and the developing process,has the status and the function which cannot be substituted. Upstream Fenhe River the basin, took a loess plateau ecology frail area independent basin unit,is the Taiyuan only water source self-control and supplies the water district, does its forest vegetation condition quality, whether affect directly to its itself ecology is safe and affects to the Fenhe River basin big city ecology barrier normally displays. Therefore the application history geography research technique to Fenhe River upstream the basin forest vicissitude history,gets to the bottom of a matter,conducts the research, the goal is discovers the humanity to move to the vegetation influence rule, thus can adopt the effective effective method to restore the vegetation, the basin ecology safely provides the reliable safeguard for Fenhe River upstream.