五种高禾草在高寒地区旱作条件下的牧草产量分析

对青海省牧草良种繁殖场所选育的5份材料;在干旱地区旱作条件下进行牧草生产性能分析试验。结果表明,供试材料产量间存在极显著差异(P<0.01)。其中,多叶老芒麦>无芒雀麦>粉绿披碱草>短芒老芒麦>扁穗冰草;所有供试材料在建植后,其牧草产量年际变幅较大,无芒雀麦变异系数相对最大。牧草产量的年际变化同时受生长季内的6～8月降水量的影响,但建植后则主要受生长年限的影响。就牧草适应性和稳产性而言,披碱草属的多叶老芒麦、粉绿披碱草最好;短芒老芒麦、扁穗冰草次之,而无芒雀麦虽表现高产,但稳产性最差。因此,在5种供试材料中除无芒雀麦外其它材料对我省高寒草地建设,退耕还草和生态治理工程的实施有一定的推广和利用价值。

FORAGE YIELD EVALUATION OF FIVE KIND OF FORAGES

In this study five kind forage were evaluated for forage yield on dryland areas,The result showed that the difference of yield between forages were very significant(P<0.01),Elymus sibiricus>Agropyron cristatum,forage yield was different every tear,andBromus inermis CV was biggest,Gerenally,Forage yield was influnced by the rainfall in July to August,but the grow~years was an important effect of forage production.On the yield and interannual variability of production,Elymus sibiricrs andElymus glaucus were best andElymus breviaristatus,Agropyron cristatum were better,Bromus inermis have the highest yield and the highest interannual variability of production.So four kind forage exceptBromus inermis were worth extending in alpine region.