紫花苜蓿品种根部特性与持久性和生物量的关系

植物的根部特性与其持久性和生产性能关系密切,但以往关于紫花苜蓿不同品种的相关研究报道较少。本试验通过对10个紫花苜蓿品种第10年的根部特性、生物量、持久性进行研究发现:不同品种紫花苜蓿根部特性差异显著(P＜0.05),其中,新疆大叶和公农1号根茎和主根粗壮,侧根数多;Super 7、Jindera、Eureka根茎和主根细小,侧根数少;L33、美国大叶、SD-006、甘农1号、Ranbule根部特性各指标居中。紫花苜蓿的根部形态指标与持久性和地上生物量显著相关,主根尤其是根茎越健壮侧根数越多,持久性越好;主根和根茎越粗壮,地上生物量越高。综合评价认为,新疆大叶和公农1号根部各形态指标均优于其他品种,地上生物量和持久性好,可以选择为适宜的紫花苜蓿品种在甘肃河西地区推广种植。

The relationship of root traits with persistence and biomass in 10 alfalfa varieties

Plant root characteristics and their persistence and performance are closely related, but there are few studies of this relationship between different varieties of alfalfa. This research evaluated the relationship of root characters with biomass and persistence of 10 alfalfa varieties. The tested varieties were planted in 2001 and have been grown for 10 years. The main measurements were done in 2011 and some related data were used from measurements from 2001. There were significant differences in root traits between the alfalfa cultivars (P＜0.05). Xinjiang Daye and Gongnong No.1 had stronger taproots and crowns and more lateral roots. The taproot and crown of Super 7, Jindera and Eureka were smaller and there were fewer lateral roots. The root characteristics of L33,Amierica Daye,SD-006,Gannong No.1 and Ranbule were moderate. In addition, significant correlations were found between root morphological index and persistence and biomass. The varieties which had stronger taproots and especially strong crowns, and more lateral roots had better persistence. Varieties which had stronger taproots and crowns had higher biomass. These results indicate that Xinjiang Daye and Gongnong No.1, which had strong roots and crowns with better biomass and longer persistence, are more suitable varieties to be widely planted in the Hexi corridor.