关键词: 沙化草地, 封育, 植被恢复, 圈养, 效益

Abstract: Grassland degradation and desertification is serious in Yanchi County, Ningxia of China. Grassland enclosure from grazing is an effective method for naturally rehabilitating of ecology in semi-arid desert steppe. An enclosure project has been set up in SiDongzi of Yanchi County in year 1990. The results showed that the natural vegetation coverage exceeded 50% after one year enclosure, the species of graminaceous grasses increased and that of unpalatable grasses decreased. The biological fence of Caragana korshinskii for grassland enclosure in SiDongzi of Yanchi County has showed good effect: not only has increased the vegetation coverage and strengthened the wind-preventing and sand-fixing effect, but also has increased the grass production of grassland. In grassland enclosure, the method of pet-rearing is the key measure that insures the success of enclosure. Besides, this method can also increase the benefit of rearing sheep in pet. The experience of enclosure project in SiDongzi of Yanchi County can be used for reference in controlling grassland desertification in semi-arid desert steppe.

Key words: desertified grasslands, enclosure, natural vegetation rehabilitation, rear livestock in pens, effect