中文摘要：

研究退化天然草地改良对草地生态恢复和草地畜牧业持续发展具有重要意义．在宁夏黄土丘陵区典型草原进行了封育、施肥、地表不处理补播、带状划破补播和水平沟整地补播改良效果的研究．结果发现，各改良措施均可使草地植物群落结构优化，可食牧草数量、产量及草地栽牧量增加．改良后，土壤0～20cm有机质、全氮和速效氮的质量分数均有所上升．综合考虑各改良措施的实施难易和效果，封育和带状划破补播可为该区典型草原首选的改良措施．

英文摘要：

Studies on improved effects of degenerate natural grassland were important for ecological restoration of grasslands and sustainable development of animal husbandry. Several improved effects of ungrazing, fertilizing, no disposed ＋ reseeding, bandingtype tillage ＋ reseeding, parallel ditches ＋ reseeding were studied in type steppe in hilly area of the Loess Plateau of Ningxia. The results showed that these improved measures optimized structure of grassland plant community. Number of edible forage,output of edible forage and carry capacity of grassland increased also. The contents of 0 - 20 cm soil organic matter, all nitrogen, and rapidly available nitrogen in different treatments had ascended.Considering the difficulty and effects of different improving measures, un-grazing and banding-type tillage ＋ reseeding could be as preferred improving measures for type steppe in hilly area of the Loess Plateau of Ningxia.