张家口坝上地区不同禾草生产性能及营养品质评价

Evaluation of production performance and nutritional quality of different grasses in Bashang area of Zhangjiakou

摘要:

为筛选出适宜在张家口坝上地区种植的禾草,揭示不同禾草的生产潜力,以丰富人工草地建植,提升草地生产力,通过随机区组试验,比较了不同禾草的产量性状、农艺性状、营养成分指标,并采用隶属函数和标准差系数赋予权重法及粗饲料分级指数(Grading Index)对不同禾草进行了综合评价分析。结果表明,不同禾草的各性状指标均存在显著差异。扁穗冰草(Agropyron cristatum)、细茎冰草(Agropyron trachycaulum)(牧丰)、老芒麦(Elymus sibiricus)干草产量能达到2 400 kg/hm2以上,相对较高;紫羊茅(Festuca rubra)和无芒雀麦(Bromus inermis)(原野)粗饲料分级指数在21.50以上,营养品质优良;综合评价表明,老芒麦和披碱草(Elymus)(垂穗二级)的草产量及品质较好,在张家口坝上地区可优先利用。

Abstract:

In order to screen out grasses suitable for planting in Bashang area of Zhangjiakou,reveal the production potential of different grasses,enrich the construction of artificial grassland and improve grassland productivity,in this study,the yield characters,agronomic characters and nutrient composition indexes of different grasses were compared through random block experiment.Meanwhile,in this study,the weights of membership function,standard deviation coefficient and Grading Index are used to comprehensively evaluate and analyze different grasses.The results showed that there were significant differences in each trait index of different grasses.The dry grass yield of Agropyron cristatum,Agropyron trachycaulum(Mufeng) and Elymus sibiricus could reach more than 2 400 kg/hm² which is relatively high;besides,forage roughage grading index of Festuca rubra and Bromus inermis Leyss (Yuanye) were higher than 21.50,with good nutritional quality.In conclusion,the comprehensive evaluation showed that Elymus sibiricus and Elymus nutans Griseb (grade 2) had better yield and quality,and could be used preferentially in the Bashang area of Zhangjiakou.