不同禾本科牧草种子萌发特性的比较研究

通过系统比较陕北农牧交错区11种引进禾本科牧草种子的萌发特性,以期为有效开展优质牧草品种筛选与评价提供理论依据.结果表明:不同禾本科牧草种子的发芽指标和幼苗指标均存在显著差异,高丹草种子的田间发芽率、室内发芽率、发芽势、发芽指数和活力指数显著最高,披碱草种子的田间发芽率、室内发芽率、发芽势、发芽指数和活力指数显著最低;苏丹草幼苗鲜重、根长、芽长和根芽比均显著高于其他牧草幼苗;不同牧草种子室内发芽率、发芽势、发芽指数、活力指数、幼苗鲜重和根长两两之间均存在显著的正相关关系;隶属函数分析表明综合排序前3位的牧草为苏丹草、高丹草和多年生黑麦草.综上表明苏丹草、高丹草和多年生黑麦草较适宜于在陕北农牧交错区进行推广种植.

Seed Germination Characteristics of Gramineae Forage Grasses

The study aims to clarify the seed germination characteristics of eleven introduced gramineae forage grasses in agro-pastoral ecotone of northern Shaanxi, and to provide a theoretical basis for the selection and evaluation of high quality forage grasses in this area. The results showed that there were significant differences in seed germination of different gramineae forage grasses, the field germination percentage, indoor germination percentage, germinative force, germination index and vitality index of Sorghum hybrid sudangras were significantly higher than those of other species, but Elymus dahuricus showed the opposite trends. The fresh weight, root length, shoot length and root shoot ratio of S. sudanense young seedlings were significantly higher than those of other young seedlings. For different forage grasses, the indoor germination percentage, germinative force, germination index, vitality index, fresh weight and root length were positively correlated with the shoot length. According to the membership function analysis, the top three species were S. sudanense, S. hybrid sudangras and Lolium perenne. These results suggested that S. sudanense, S. hybrid sudangras and L. perenne were more suitable for planting in agro-pastoral ecotone of northern Shaanxi.