不同混播方式下苜蓿＋无芒雀麦人工草地生产力动态研究

2006-2007年在地处西辽河平原的内蒙古民族大学试验农场。对不同混播方式下紫花苜蓿＋无芒雀麦人工草地生产力动态进行研究．结果表明，紫花苜蓿的株高混播低于单播，而无芒雀麦株高则混播高于单播．返青期同行混播、间行混播生产力均高于单播苜蓿和单播无芒雀麦；苜蓿进入现蕾期之后混播生产力低于单播苜蓿而高于单播无芒雀麦，间行混播生产力高于同行混播．生长前期无芒雀麦的组分比例间行混播高于同行混播，生长后期二者组分比例趋于一致．间行混播种间干扰大于种内干扰出现的时期晚于同行混播，同行混播下无芒雀麦的竞争力总体上高于间行混播下的竞争力．

Research on the Dynamics of Productive Forces of Alfalfa + awnless brome Man-made Grassland under the Different Patterns of Mixed Sowing

The dynamics of productive forces of alfalfa and awnless brome man- made grassland was studied on the experimental farmland of the Inner Mongolia university for Nationalities on Xi Liao He plain. The conclusion showed that the height of the mixed sowing alfalfa is lower than the singled sowing alfalfa, however,on the contrary for the awnless brome. The productive forces of the one - line mixed sowing and inter - line mixed sowing in the green returning periods are all higher than the productive forces of the singled sowing; The productive forces of the mixed sowing alfalfa is lower than the singled sowing alfalfa but higher than the singled sowing awnless brome, the productive forces of the inter- line mixed sowing is a little higher than that of the one -line mixed sowing. The constituent ratio of the awnless brome under the inter- line mixed sowing is higher than that of the one - line mixed sowing at the beginning of the growing periods, but the ratio will tend to the same in the end of the growing periods. For the periods that the inter - specific disturbance is much than the specific disturbance, the inter - line mixed sowing is later than the one - line mixed sowing, the competitive forces of the one- line mixed sowing awnless brome is higher than that of the inter- line mixed sowing generally.