行距与栽培年限对老芒麦鲜草及种子产量的影响

试验对30、45、60、75 和90 cm行距下，第2-5年老芒麦（Elymus sibiricus）枝条性状、花序性状、鲜草产量及种子产量进行比较分析。结果表明，行距、年份及互作对枝条高度、枝条密度、生殖枝比例、小穗数/生殖枝、小花数/生殖枝、潜在种子产量、表现种子产量与实际种子产量均有极显著影响，其中行距是主要影响因子，互作次之，年份最小；30～45 cm行距适合老芒麦鲜草生产，60 cm行距是种子生产的最佳行距；鲜草产量、种子产量第3年达高峰，30 和45 cm行距第3年鲜草产量分别为19 225.6和16 733.4 kg·hm-2，60 cm行距第3年种子产量达1 620.67 kg·hm-2，远大于其他处理组合，值得在生产中推广与应用。

Influence of row spaces and planting years on yield of fresh grass and seeds of Elymus sibiricus

In this study,influence of five row spaces(30,45,60,75 and 90 cm) and 2―5 cultural years on the characteristics of shoots,inflorescences,seed yield and grass yield of Elymus sibiricus were measured and analyzed by using a randomized block design.The results showed that row space,cultural year and their interaction all affected height and density of shoots,proportion of fertile tillers,spikelets/fertile tillers,florets/fertile tillers,potential seed yield,presentation seed yield and harvested seed yield significantly.The affected order from big to small was row space>interaction>cultural year.The row space of 30-45 cm was beneficial to fresh grass production,while the row space of 60 cm appropriated seed production.In the third year,the fresh grass yield was the highest with the values of 19 225.6 kg·ha-1(30 cm) and 16 733.4 kg·ha-1(45 cm) respectively.Yet seed yield was the highest in the row space of 60 cm with the value of 1 620.67 kg·ha-1.Therefore,forage production should be planted with the row space of 30-45 cm and seed production should be planted with the row space of 60 cm.