中文摘要：

在川西北高原沙化生境中，应用6种禾本科牧草进行了不同种群组合处理，研究其群落特征与系统的稳定性。结果表明：群落物种多样性随均匀度增加而减小（相关系数为0．94）；在构建的13种人工群落中，垂穗披碱草＋多花黑麦草＋紫羊茅＋沙生冰草群落具有较高的盖度、生物量和多样性指数，适合恢复川西北地区的退化、沙化草原植被；在所有供试物种中优势度最大的3种牧草分别是川草2号老芒麦、垂穗披碱草和沙生冰草。

英文摘要：

In order to restore the degraded and desertified grasslands on the northwest plateau of Sichuan, six gramineous species were used to establish various modes with different combinations of plant communities. The community characteristics and ecosystem stability of these combinations indicated that the species diversity in the communities decreased with the increase of evenness （r=0. 94）. Among the 13 reconstruction modes, the community Elymus nutans ＋Lolium multiflorum ＋ Festuca rubra ＋ Agropyron desertorum had higher coverage, biological yield, and species diversity, being suitable for the restoration of the degraded and desertified grasslands in northwest Sichuan. Among the test species, Elymus sibiricus, Elymus nutans, and Agropyron desertorum had the highest dominance.