不同盐浓度下硅对高羊茅根系特征的影响

Effect of silicon supply on root features of tall fescue in different salt concentrations

利用盆栽试验研究了不同盐浓度生境下硅对高羊茅(Festuca arundinacea)根系生物量和根系形态特征的影响。结果表明,在盐浓度0-300 mmol·L^(-1)的范围内,高羊茅根系生物量、根系表面积、根系体积、根系平均直径和根系总长均随盐浓度增加而呈降低趋势,高羊茅根冠比随盐浓度增加呈现先增加后降低趋势。硅对高羊茅根系生物量和根系特征的影响与盐浓度密切相关,当盐浓度≤150 mmol·L^(-1)时,硅显著提高了高羊茅根系生物量、根系表面积和根系总长(P<0.05),说明硅在一定盐浓度下通过增加高羊茅根系生物量,改变根系形态特征,提高高羊茅在盐生境的生长能力。

A pot experiment was conducted to determine the effect of silicon supply on the biomass and the root features of tall rescue （Festuca arundinacea） seedlings under different salinity conditions. This study showed that the root dry biomass, total surface of roots, root bulk, total length of roots,and average root diameter were decreased, but the root to shoot ratio of tall rescue seedling initially increased and then decreased with an increase in the salt concentration from 0 to 300 mmol· L^-1. The contribution of the silicon supply to root biomass and root features was closely related to the salt concentration： the silicon supply significantly increased the root biomass, the total surface of roots, and the total length of roots （P〈0.05） when the salt concentration was 4150 mmol· L^-1. These results suggested that silicon supply could improve the adaptation ability of tall rescue in different salinity conditions by the alteration of the root biomass and root features.