唐至元时黄土高原腹地植被变迁

泾洛流域居黄土高原腹地,唐宋金时期,随着气候变冷变干,加之人为屯田开发,使原来这一地区的山地森林植被减少,旱生草类和泾洛上游农田植被增加。元代虽在关中和陇东屯田,但农田植被不如前代面积广大,而草地植被有所增加。明了黄土高原腹地植被的变迁,窥斑见豹,对今天恢复这一地区的植被意义重大。

The changes of vegetation in the hinterland of Huangtu Plateau during the Tang, Song, Jin and Yuan dynasties

The Jing-Luo River valley lies in the hinterland of Huangtu Plateau.During the Tang,Song,and Jin dynasties,the mountainous region and forests there decreased because of the colder and drier climate and,in contrast,xerophyte there and the fields in the upper reaches of the Jing-Luo River increased.During the Yuan Dynasty,although fields were artificially opened up within the central Shaanxi plain and in the east of Gansu,the area of fields there was smaller than that of the former dynasties.Therefore,it seemed that the area of grassland must have been enlarged.Understanding the changes of vegetation in the hinterland of Huangtu Plateau,we can further comprehend the significance of restoration of vegetation there.