干旱环境下4种高原禾本科牧草产量及营养品质比较

Comparison of yield and nutritional quality of 4graminaceous forages on plateau under arid environment

摘要:

为筛选适宜干旱、半干旱环青海湖地区生长的优良牧草,测定了高原地区生长的4种禾本科本土牧草的生产性能和营养价值指标,并结合灰色关联度分析法进行了综合评价。结果表明,大颖草(Roegneria grandiglumis)和扁穗冰草(Agropyron cristatum)的叶茎比和鲜干比较高,适口性更好;同德短芒披碱草(Elymus breviaristatus cv.Tongde)的干草产量为最高,大颖草、同德短芒披碱草、同德贫花鹅观草(Roegeria pauciflora cv.Tongde)的草产量之间差异不显著;扁穗冰草的营养价值相对最好;4种供试牧草综合评价表现由高到低为:扁穗冰草＞大颖草＞同德贫花鹅观草＞同德短芒披碱草。

Abstract:

In order to select excellent forages suitable for the arid and semi-arid area around Qinghai Lake,the performance and nutritional value indexes of four native grasses growing in the plateau area were determined,and the comprehensive evaluation was made by the grey relational analysis method.The results show that leaf-stem ratio and fresh-dry ratio of Roegneria grandiglumis and Agropyroncristatumis are higher than others.The hay yield of Elymus breviaristatus cv.Tongde is the highest.There is no significant difference in the grass yield among R.grandiglumis,A.cristatum and R.pauciflora cv.Tongde.Nutritional value of A.cristatum is the best.The comprehensive evaluation performance ranks from high to low as A.cristatum＞R.grandiglumis＞R.pauciflora cv.Tongde＞E.breviaristatus cv.Tongde.