Abstract: The research investigated the relationship between productivity and species in artificial grasslands with mixed-sowed gramineous and leguminous forages in Lhasa River Valley, in order to select the best combination. Triticale (×Triticosecale), oats (Avena sativa), and common vetch (Vicia sativa) were used as materials, and 4 mixed-sowing combinations and 7 mixed-sowing ratios were set to study the forage yields and other indicators. The results were shown as followed. There was no significant difference in dry yield between the four mixed-sowing combinations and ratios compared with the monoculture with gramineous or leguminous forages. Both the relative yield and the relative density of gramineous and leguminous forages under the mixed-sowing ratios of 6:4 and 3:7 of 'Zhongsi No.828' vs common vetch were both more than 1, indicating good interspecific compatibility, less competition, and advantages of mixed-sowing. The relative importance analysis showed that the proportion of gramineous forages was the most important factor affecting the yield, and more gramineous forages in mixed sowing produced larger yield. Correlation analysis showed that both interspecific competition and promotion in mixed-sowing grassland were observed, and gramineous forages tended to inhibit the growth of common vetch. In addition, both gramineous forages and common vetch obtained more resources by expanding the population and space area.

Key words: Triticale, Oats, Common vetch, Mixed-sowing, Productivity, Interspecific relationship

摘要： 为探究拉萨河谷农区禾豆混播人工草地生产力与种间关系，筛选最佳混播组合及比例，以小黑麦（×Triticosecale）、燕麦（Avena sativa）、箭筈豌豆（Vicia sativa）为试验材料，设置4个混播组合及7个混播比例试验。结果表明：4种混播组合及其混播比例处理的干草产量与禾草单播或箭筈豌豆单播无显著性差异；'中饲828’小黑麦和箭筈豌豆混播比6∶4和3∶7处理下禾豆相对产量、相对密度均大于1，表明种间相容性好、竞争小，产生混播优势；相对重要性分析表明，禾草所占比例越大，总产量越高。相关性分析表明，混播草地种间竞争以及种间促进现象同时存在，总体呈现禾草抑制箭筈豌豆生长的现象。此外，禾草、箭筈豌豆均表现为以扩张种群数量、增加空间面积的方式获取更多资源。

关键词: 小黑麦, 燕麦, 箭筈豌豆, 混播, 生产力, 种间关系