关键词: 茈碧湖, 人类活动, 演变过程

Abstract: The Change of lakes represents the changes of their envoirments, specialy for those of little lakes. Based on the records in Xu Xia ke's Travels, in this thesis the authors reconstructed the old Cibi Lake which existed 300 years ago.The discoveries are as follows:1.During 17th centuny,the lake was clout twice as big as the present one and was changing slowly. There were two connected lakas in this area. One was in the north,and the other in the south.2. During 18-19th century,the population increased rapidly,and at the same time the affects of human activties were also intensified. The trees were cut doun,and large area of land was reclaimed for aguicultural uses. Consequently,the lake was reduced greatly,and the south lake disappeared at that time.3. During 20th century,the population is still growing. Local people turned the north lake into a small reservoir. The north lake,which changed rery slowly before,is also reduced greatly now.The effects of the human activities are much greater than those of the nature. Human activities are the main causes of the shrinkage of the lake in recent 300 years.

Key words: Cibi Lake, Human activity, Changing process