Abstract: No-tillage reseeding is one of the important measures to improve degraded grassland,which plays an important role in improving grassland production performance,improving forage quality,and promoting soil nutrient cycling.In order to clarify the effects of reseeding of excellent forage on the production performance and forage quality of degraded grassland in Zhaosu,Xinjiang,this study took the degraded grassland of Zhaosu in Xinjiang as the research object,set up the non-reseeded grassland as the control,and reseeded Bromus inermis Leyss.,Elymus nutans Griseb.,Agropyron cristatum （L.） Gaertn.,Medicago varia,Onobrychis viciaefolia Scop., Lotus corniculatus Linn.） in Zhaosu grassland. The results showed that the dry matter biomass of reseeding grassland increased by 36.92% and the crude protein content of forage grass increased by 4.38% on average compared with the control. The correlation between the dry matter biomass of Bromus inermis Leyss.and its influencing factors was 65.81%,while the Medicago varia correlation between the relative feeding value of forage grass and its influencingfactors was 67.55%. Therefore,no-tillage reseeding can improve the production performance and forage nutritional quality of degraded grassland.Among them,reseeding Bromus inermis Leyss. can significantly improve the production performance of degraded grassland,and reseeding Medicago varia can significantly improve the forage quality of degraded grassland.

Key words: Degraded grassland, No-tillage reseeding, Production performance, Nutritional quality of forage, Soil nutrients

摘要： 免耕补播是改良退化草地的重要措施之一,对提升草地生产性能、改善牧草品质和促进土壤养分循环具有重要作用。为明确补播优良牧草对新疆昭苏退化草地生产性能和牧草品质的影响,本研究以新疆昭苏退化草地为研究对象,设置不补播草地作为对照,通过免耕补播无芒雀麦（Bromus inermis Leyss.）,披碱草（Elymus nutans Griseb.）,扁穗冰草[Agropyron cristatum（L.）Gaertn.],杂花苜蓿（Medicago varia）,红豆草（Onobrychis viciaefolia Scop.）,百脉根（Lotus corniculatus Linn.）6种优良牧草,研究补播不同牧草对退化草地生产性能和牧草品质的影响。结果发现,补播草地干物质生物量平均较对照提高了36.92%,牧草粗蛋白含量平均较对照提高了4.38%。补播无芒雀麦的干物质生物量与其影响因素的关联度为65.81%,而补播杂花苜蓿处理下牧草的相对饲喂价值与其影响因素的关联度为67.55%。因此,免耕补播可提高退化草地的生产性能和牧草营养品质,其中,补播无芒雀麦可显著提升退化草地生产性能,而补播杂花苜蓿可显著提升退化草地的牧草品质。

关键词: 退化草地, 免耕补播, 生产性能, 牧草营养品质, 土壤养分