关键词: 环境演变, 沙漠化, 人类活动, 科尔沁沙地

Abstract: Desertification in North and Northeast China has become a commonly concerned problem among environmental scientists. The desertification in the Maowushu and Horqin Sandlands of Inner Mongolia Autonomous Region is the most serious in the country. In order to investigate the past human impact on sand dune mobilization and land degradation, we collected two sediment cores in Bakeyao Lake, Southeastern Horqin Sandland, and analyzed the pollen and algae spore from one of them. The result shows that the little lake was formed in 1837, when the first migrates from Shandong and Hebei Provinces arrived in the study area for agriculture production. The original sand dune vegetation was greatly destroyed by the early settlers, and a series of little lakes were formed owing to the reduced plant evapotranspiration. The later changes of the lake and sand land system were controlled by the interaction among human activities, climates and the initial intervention. Since the early ninetieth, human activities have been the dominating factor in the sand land environmental changes. The feedback process within the sand land system may have been of importance.

Key words: environmental change, desertification, human activities, Horqin Sandland