关键词: 多伦县, 沙质草原植被, 变化趋势

Abstract: In 2001 we made an on the spot thorough investigation into the 28 sample spots on grassland of Duolun County. These sample spots had ever been investigated in 1984. Comparison of grassland vegetation clearly shows that: potential desertified land accounts for the majority of the total area; the proportion of medium degenerated and seriously degenerated lands has enlarged to be more than 50 percent of the desertification area. But there are still obvious effects of closing grassland. Vegetation recovered in some degraded spots. The most typical case is Sheng Li village, where the Artemisia frigida community (sandy chestnut soil, Artemisia frigida+Cares duriussula+rank grass, seriously degenerated) in sandy grassland has recovered to community dominated by Stipa glandis. Community in many sample spots is still degenerating under irrational exploitation. Excavation and reclamation are most destructive. Under the action of wind erosion and water erosion, the gap developed and desertification would be faster and faster.

Key words: Duolun County, sandy grassland vegetation, changing tendency